We have spent the last two posts building the Stoic framework: why a philosophy of life matters, and what Stoics actually believed and the compass they left us. Today we test it. Because the real question about any philosophy is not whether it sounds good. It is whether it holds up when things get hard.

This post sits in the Purpose and Philosophy of Life area of the Mind Pillar, and it is the most practical post in the area so far: it takes the Stoic framework built across the previous two posts and tests it against the kind of difficulty that actually lands in real life. The Emotional Resilience and Stress Management area, coming later in the Mind series, builds on the same foundations, applied to longer patterns of stress and coping rather than specific hard moments.

The Thing Nobody Warns You About

I moved country with a six-month-old and a two-and-a-half-year-old to pursue research abroad. My husband travelled two weeks out of every four. Which means that for two weeks out of every four, I was the only adult in the house, managing two children under three, building a research career in a new country, with no family nearby, no established support network, and no clear idea of when it would feel less overwhelming.

From the outside it looked like an adventure. From the inside it looked like the laundry pile at 11pm, the baby refusing to sleep for the fourth night in a row, the toddler who needed more of me than I had left to give, and the quiet, persistent feeling that I was failing at everything simultaneously, the research, the parenting, the partnership, because I could not be fully present to any of them.

Nothing was catastrophically wrong. That was almost the problem. There was nothing to point to, no single crisis to resolve. There was just the weight of it, accumulating, day by day, in the gap between the life I had chosen and the reality of living it.

It was during that stretch that I first read Epictetus properly. Not as a philosophical exercise. As a field manual.

That is the kind of hard Stoicism was built for. Not only the dramatic losses, the grief, the diagnosis, the sudden rupture. The sustained, unglamorous, invisible kind that does not get acknowledged because from the outside everything looks fine.

And it is also the kind of hard that the women reading this know better than most. The particular weight of being the one who notices everything, remembers everything, organises everything, and whose noticing and remembering is so invisible that it doesn’t even register as work. The mental load that accumulates not in single dramatic moments but in the ten thousand small ones: the packed lunch that nobody else thought to make, the dentist appointment that only you remembered, the emotional temperature of the household that only you are monitoring. The years of being the default parent, the default worrier, the default keeper of the whole operation.

And for some readers, layered on top of all of that: the 3am wake-up that is not quite anxiety and not quite grief. The rage that arrives before you have a reason. The appointment where you described your symptoms and were told it was probably stress. The feeling, captured so precisely in research on women in midlife, that your body is renegotiating its terms without consulting you, while you are still expected to show up for everything else at full capacity.

This is not a philosophy developed in comfort by academics writing for a comfortable audience. It was developed in the middle of actual life, by people facing conditions most of us will only encounter at the edges of ours. Epictetus, enslaved. Marcus Aurelius, governing an empire while watching his children die. Seneca, writing his clearest thinking in the final years of his life, knowing that Nero might order his execution at any moment.

They were not performing resilience. They were trying to figure out, in real time, how to act with integrity when acting with integrity cost something.

What they left us is a toolkit. This post is about how to use it when you need it most.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The Foundation: Sort First

When something hard arrives, the first instinct is to react. To fix. To resist. To collapse. All of these are understandable. Most of them are costly.

The Stoics begin differently. Before anything else, sort.

The trichotomy of control is the first tool you reach for in any difficult situation, not because it makes the difficulty smaller, but because it tells you where to direct your energy. Everything falls into one of three categories: fully within your power, partially within your power, or entirely outside it1.

Let me give you a few concrete examples, because this distinction matters most when it is hardest to see clearly.

Your child is struggling at school and you don’t know why. The outcome, whether it resolves, how long it takes, what it means for them, is not fully within your power. What you do today: the conversation you initiate, the attention you bring, the support you arrange, that is yours. Investing your energy in catastrophising about the outcome is wasteful twice over: it drains you and it does not change the outcome.

You are overwhelmed at work. The volume of demands is not within your power. Your manager’s priorities are not within your power. Whether you get through today by reacting to everything that arrives, or by choosing deliberately what to engage with and what to let sit, that is yours.

You are waking at 3am, which is disrupting everything, mood, concentration, patience with your children and your partner. The broken sleep is partly the hormonal transition for some readers, partly elevated cortisol for many more, partly the racing mind that arrives uninvited at all ages. The hormonal component is not fully within your power. But the conditions you are creating around sleep, the alcohol at dinner, the screen time before bed, the unfinished conversation you took to bed with you, those are partially or fully yours. The sleep post covers the levers in detail.

The point across all of these: sorting before you act prevents you from investing furious energy in what cannot be changed, while neglecting what can.

Epictetus knew this because he lived it under conditions most of us will not face. He had been owned by someone else. His body, his location, his daily existence: none of it his to control. And from that position of absolute external constraint, he wrote the most uncompromising account of internal freedom in Western philosophy.

”Seek not that the things which happen should happen as you wish; but wish the things which happen to be as they are, and you will have a tranquil flow of life.”

That is not resignation. It is a precise allocation of effort. Everything into what you can influence. Nothing wasted on grieving what you cannot.

The Second Move: Let It Be What It Is

There is a principle the Stoics lived by that is often misattributed and frequently misunderstood. Amor fati. Love of fate.

Not acceptance in the sense of going limp. Not pretending that what is hard is not hard. Something more specific and more demanding: the willingness to take what arrives, including what is genuinely painful, and to work with it rather than against it.

I want to name what this asks of women specifically, because I think it is under-discussed in wellness content that tends to be either relentlessly practical or relentlessly spiritual.

The letting go that amor fati invites is not passive. It is active and it is specific. It means letting go of the idea that you can control how your children turn out, while continuing to do your best. It means letting go of the version of your career that you imagined at 28, while continuing to invest in the one in front of you. It means letting go of the expectation that your body in your 40s should perform like your body in your 30s, while continuing to take care of it. In each case, the letting go is not resignation. It is the precise, deliberate redirection of energy from what cannot be changed to what can.

For women in perimenopause specifically, this has an added and personal dimension. The transition is asking you to let go of a version of yourself, the version whose body behaved predictably, whose energy followed certain rules. Some of that loss is real and worth grieving. The Stoics would not tell you otherwise.

But there is a difference between grieving what is genuinely over and resisting what is simply changed. The research is increasingly clear that the transition, however disruptive, is also a reorganisation, one that, for many women, eventually produces a clarity about what matters that the earlier decades did not.

What remains, on the other side of acceptance, is almost always more than we think.

The Third Move: Use the Obstacle

There is a passage in one of Marcus Aurelius’ Meditations adaptation I return to more than almost any other.

He wrote this as a man managing an empire in decline, fighting wars he had not chosen, watching the people he loved die before him. He was not being motivational. He was being precise.

The Stoics understood something about adversity that takes most people decades to learn: difficulty is not an interruption of the real work. It often is the real work. The impossible conversation reveals character. The diagnosis reorganises priorities. The years of sustained overwhelm, the new-country-with-young-children years, the perimenopause years, force a reckoning with what actually matters. That reckoning is not a detour. It is the education.

This is not the toxic positivity that insists everything happens for a reason. It is the more honest observation that you are always building something with what you have, including what you did not ask for. The Stoics would call it the discipline of action: act well regardless of outcome, invest fully in the effort, and release your grip on the result.

“The archer draws the bow as well as possible, aims with full attention, and then releases. Whether the wind shifts in the last moment is not within the archer’s power. The quality of the draw is.”

The Fourth Move: Remember It Ends

Memento mori. Remember you will die.

This sounds, to modern ears, like an invitation to despair. The Stoics meant something almost the opposite.

I am aware this is an unusual thing to say to an audience of women in their 30s, 40s, and 50s, many of whom are already quietly reckoning with mortality in a way their younger selves were not. The parents who are ageing. The friends who have had difficult diagnoses. The body that is visibly changing. The sense that time has a different texture now than it did at 25.

The awareness that time is finite is not a reason for anxiety. It is the most effective tool available for restoring proportion. The grudge you have been carrying for months. The opportunity you have been putting off until conditions are better. The conversation you keep meaning to have. Held against the fact of your own mortality, not morbidly, but honestly, these things change size.

And it works in the other direction too. The people you love. The ordinary Tuesday evening that, if you stopped to notice, contains more than enough for a good life. The fact that you are here, functioning, reading this, capable of thinking about how you want to live. Held against the same awareness, these things also change size.

William Irvine considers negative visualisation, the deliberate practice of imagining the loss of what you value, the single most important Stoic practice. Memento mori is its largest form. Not a reason to grieve prematurely, but a reason to show up more fully for what is already here.

What Stoicism Cannot Do

I want to be honest about the limits, because I think dishonesty here is what turns people away from philosophy when they need it most.

Stoicism cannot fix a hormonal transition. It cannot take away genuine grief. It cannot make loss not hurt. It cannot speed up the process of adjusting to something that has fundamentally changed your life. It is not a substitute for adequate sleep, for the metabolic foundations the Body Pillar covers, or, where appropriate, for medical support including HRT. A philosophy of life is not a replacement for the body’s basic needs, it is what you build on top of them.

What Stoicism offers in hardship is not comfort. It is structure. A way of remaining oriented when the external landmarks have gone. A set of questions that are answerable even when nothing else feels certain: what is within my power here? What is the right action available to me now, regardless of the outcome? What would a person of good character do in this situation?

Those questions do not make hard things easy. They make them navigable.

A Note on What’s Coming

I have been building something alongside this series.

The Pocket Stoic is a situation-by-situation reference guide to Stoic wisdom for the specific moments that are hardest to navigate. Not a philosophy textbook. A companion. You open to the chapter that matches your moment, on anger, on anxiety, on overwhelm, on grief, on the kind of fatigue that sleep doesn’t fix, you get the ancient wisdom in plain language, practical steps, and prompts you can use the same day. Then you close the book and handle your life.

The next posts in this series will give you three chapters as a preview: on anxiety and worry, on overwhelm and decision fatigue, on envy and comparison. Each one is built on the compass.

The book will be available later this year. If you want to be the first to know, you are already in the right place.

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

If this post reached something real for you, I’d be grateful if you forwarded it to someone who might need it, or hit the ♥️ or ↻ Restack button. It helps more people find this space.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

References

If you’ve just subscribed, welcome. If you’ve been reading for a while and want a clearer picture of how everything connects, this is for you too.

Swiss Army Mum is a practical guide to long-term health for women over 35, built on four pillars: Body, Mind, Glow, and Flow. Not every tool. Just the 20% that actually moves the needle.

The posts go deep. The science is real. But landing in the middle of an archive without a map is disorienting, especially when you’re already short on time.

Quick Start Guide

This one-pager gives you the full picture at a glance: what each pillar covers, what kinds of posts to expect, and where to begin.

SAM_Quick_Start_Guide

194KB ∙ PDF file

Download

Your one-page map to Swiss Army Mum. Four pillars, what to expect, and where to start — all at a glance.

Download

It’s free. No sign-up required beyond your existing subscription.

If you want a full table of contents, ordered by pillar, the hub post has every published piece in one place.

Frequently Asked Questions

Is Swiss Army Mum free? Yes. All written content is free. Every post, every pillar, every tool.

What is Swiss Army Mum?

Swiss Army Mum is a free, science-backed newsletter for busy women over 35, built around the four pillars of long-term health: Body, Mind, Glow, and Flow. Each pillar has its own series of posts distilling the peer-reviewed research to the 20% that actually moves the needle: no optimisation culture, no wellness fluff, no overhaul required.

It's written by Dr. Mica, a chemical engineer and researcher, in the same way she'd explain it to a smart friend over coffee.

Think of it as the integrated system nobody handed you when you hit your mid-thirties and realized the old rules had stopped working.

Where should I start?

Download the Quick Start Guide above, then head to the hub post for a full index of everything published so far, ordered by pillar.

What is the SAM framework?

Four pillars: Body (sleep, fuel, exercise), Mind (purpose, inner world, stress management, connection), Glow (skin, hair, hormones), and Flow (systems, routines, habits). Each pillar has its own series of science-backed posts distilling the research to the 20% that matters most.

Who is Dr. Mica?

A PhD in chemical engineering with a research background, two kids, and a dog. Swiss Army Mum exists because I needed it and couldn’t find it: a single, simple, integrated system covering the science of long-term health for women over 35, without the hype.

You can read a bit more about me in my about page.

How often do you publish?

Once a week. Occasionally a bit more.

What is The Blueprint?

It starts with the app: an interactive version of the SAM framework, the 80/20 of long-term health in your pocket, ready to reference in 30 seconds.

But it goes further than that. Paid subscribers will get access to a resource vault (one-pagers, printable guides, and tools that sit alongside the posts), a community space, and more!

Everything you need to turn what you’ve read into something you can actually use. Included with a paid Substack subscription.

We found each other on Substack the way most good things happen, by accident, and at the perfect time.

Erika writes The Regulated Mom. She’s a holistic health coach working with moms over 40 who struggle with anxiety, overstimulation and nervous system chaos. Her lane is the nervous system - specifically, what happens when it’s been stuck in overdrive for so long that chaos starts to feel like the norm. Dr. Mica writes Swiss Army Mum. She’s a scientist cutting through the noise for women 35+ who want the biology - the 20% of inputs that actually drive 80% of the outcomes - without the 12-step protocol or the overwhelm of a supplement stack.

We were writing about the same woman but from opposite ends of the same problem. Erika working top-down: regulate the nervous system, let the body follow. Mica working bottom-up: fix the biology, give the nervous system something solid to stand on.

The more we talked, the more we could see. These approaches don’t compete. They complete each other. They are two halves to the whole.

So we decided to write this together.

Today’s topic is the gut-brain axis. If you’ve ever noticed how a stressful week can trash your digestion, or noticed that eating like garbage makes your anxiety worse, you already know this connection exists. You just haven’t had anyone explain it from both ends at once.

Until now. Erika goes first.

Nervous System Dysregulation

Your Body Knew Before You Did. What Nervous System Dysregulation Looks Like in Midlife Moms

That’s the part nobody tells you. The anxiety that shows up out of nowhere. The bloating that comes and goes with zero logical pattern. The fact that you went from someone who could handle ANYTHING to someone who is one spilled cup away from a complete meltdown - and your stomach is somehow always involved.

That is not a coincidence. That is your nervous system talking to your gut, and your gut talking right back.

Here’s what’s happening.

When Your Nervous System is Running The Show, Your Gut Pays The Price

Chronic stress, the kind that doesn’t come from a single incident but from years of holding everything together for everyone, does something very specific to your digestive system. It is not subtle.

When your body perceives a threat, it shifts resources. Blood flow moves away from your digestive organs toward your muscles and heart. Gut motility slows, food sits, ferments, and becomes a problem. The migrating motor complex (MMC), responsible for keeping things moving and clearing bacteria between meals, gets disrupted. Research in The Journal of Physiology confirms that both acute and chronic stress produce wide-ranging changes across gut function - altered motility, increased sensitivity, disrupted intestinal signaling.1 This is where the bloating, constipation, nausea, and the “I don’t even know what’s happening in there” come from.

It gets messier. Chronic stress increases intestinal permeability. The tight junctions lining your gut loosen, and what’s supposed to stay contained - bacteria, toxins, partially digested food - starts leaking through. A 2023 study found that chronic stress significantly suppressed tight junction protein expression, increased gut permeability, and drove systemic inflammation as a result.2 Leaky gut is not just a wellness influencer trend. It is a documented physiological response to sustained stress.

And then there’s the microbiome. Mica will dive into how estrogen and the estrobolome factor in here as well. Stress reduces bacterial diversity, depletes beneficial strains, and creates conditions where harmful bacteria thrive. A 2023 analysis in Biological Psychiatry found that stress-driven microbiota shifts directly compromise the intestinal barrier, allowing bacterial products to enter the bloodstream and trigger systemic inflammation.3 Less microbial diversity means less production of short-chain fatty acids, or SCFAs, your gut lining needs to repair itself, fewer neurotransmitter precursors, and a more reactive, inflamed system overall.

What’s fascinating is your nervous system didn’t just stress you out. It physically restructured your gut.

You’ve been living the signs. You just didn’t know what you were reading.

The behavioral and emotional signs that the gut-brain axis is under strain are easy to miss because they don’t necessarily look like gut problems on the surface.

• You’re anxious but can’t point to a reason.

• Your mood crashes after meals.

• Brain fog rolls in mid-afternoon and doesn’t lift.

• You’re exhausted in a way that sleep doesn’t fix.

• Food that never bothered you before is suddenly a problem.

• You feel wired and depleted at the same time, which makes no sense and yet is somehow exactly how you feel.

Every. Single. Day.

There’s also the reactivity. The short fuse. The way your patience evaporates faster than it used to. That’s not a personality shift. That is a gut producing less serotonin because over 90% of your serotonin is made in the gut, produced by specialized cells in your intestinal lining, and regulated in part by your gut microbiome.4 And add in a nervous system that has been in threat mode so long it has forgotten what settled feels like.

This is what dysregulation looks like when it’s been going on long enough to become the baseline. You don’t feel stressed. You just feel like this is who you are now.

But it’s not.

Calming your nervous system is a gut intervention. Full stop.

The reason breathwork, rest, and co-regulation practices are not just stress management tools is because they directly shift the state of your gut. Vagal nerve activation, the kind that happens when your nervous system moves out of threat mode and into safety, restores gut motility, reduces intestinal permeability, and signals the microbiome environment that it is safe to function normally again. A 2022 study found that transcutaneous vagal nerve stimulation directly protected against stress-induced intestinal barrier breakdown in healthy adults.5

You cannot supplement your way out of a gut that is being dismantled by a nervous system stuck in survival mode. The regulation has to come first.

Now let’s flip the direction of the conversation. Erika showed what stress does to the gut.

Now Mica will show us what the gut does back to the brain.

Interested in The Regulated Mom? Start here:

The Regulated Mom

Welcome. If You're a Mom in Your 40s Who's Tired of Feeling Like You're Failing, Read This First.

You love your kids. You’re doing everything right on paper…

Read more

3 months ago · 1 like · Erika Glover

Erika Glover is focused on helping moms over 40 with young kids go from anxiety, overstimulation, and mom rage to systemic regulation and finding safety and fun in motherhood again.

Here, we regulate first.

Subscribe to The Regulated Mom

Your Gut Has 500 Million Neurons. Here Is What They Are Saying.

Here is the piece of the picture that changes how you read everything Erika just described: 90 to 95% of your serotonin is not made in your brain. It is made in your gut, by cells lining the intestinal wall, regulated by the bacteria living just beneath them.6 The neurotransmitter your mood, stress response, and cognitive clarity depend on originates, in the main, from below.

This is not a metaphor. It is anatomy. And it explains why regulating the nervous system from the top down, while your gut biology is quietly disrupted, is like trying to stabilize a building from the roof.

The wiring

The gut has its own local nervous system: 500 million neurons embedded in the gut wall that manage digestion completely independently, without waiting on instructions from the brain.7 This is the enteric nervous system, sometimes called the second brain. The vagus nerve is the long-distance cable that connects it to the brain. Think of it as a motorway with a very specific traffic pattern: roughly 80 to 90% of the vehicles are travelling upward, gut to brain, not the other way.8 Your gut is not a passive recipient of orders from headquarters. It is filing reports constantly, and most of the communication in this relationship originates below.

This is where the biology meets what Erika described. Chronic stress lands in the gut and disrupts it structurally. But the gut does not stay silent in response. Through the vagus nerve, through serotonin signalling, through the immune molecules produced by a disrupted microbiome, it sends that disruption straight back to the brain. The loop is genuinely bidirectional. Fixing one end without addressing the other is incomplete.

What perimenopause does to this loop

Oestrogen receptors are distributed throughout the gut: in the gut lining, in the enteric nervous system, and in the cells regulating the intestinal barrier. As oestrogen declines during perimenopause, the downstream effects reach well beyond hot flushes. A large study of 2,300 hispanic participants found that postmenopausal women had lower microbiome diversity and a significantly altered gut composition compared to premenopausal women: changes linked to worse cardiometabolic health.9

The bacteria responsible for metabolising and recirculating oestrogen, collectively known as the estrobolome, become less efficient as diversity drops, which drives oestrogen lower still. The loop tightens in the wrong direction. As the gut lining becomes more permeable, bacterial fragments cross into the bloodstream, reach the brain, and raise the baseline reactivity of the nervous system. It is one of the reasons mood strategies that worked reliably at 35 stop working at 45. The biological substrate has changed.

The metabolic amplifier

Chronically unstable blood sugar dysregulates the HPA axis (the body’s central stress-response system) over time, keeping cortisol elevated as the body repeatedly attempts to restore glucose homeostasis. Cortisol in turn directly disrupts the gut environment: it alters bacterial growth patterns, worsens gut permeability, and feeds the inflammatory loop the gut is already struggling to contain.10

Chronically elevated insulin deepens that inflammatory environment further. It builds silently over years, and one of the places it quietly does damage is the gut, where a chronically pro-inflammatory environment shifts the balance toward bacterial strains that worsen permeability and reduce short-chain fatty acid production.

Poor sleep is the third variable, and arguably the most underestimated. The gut operates on a tight circadian schedule. Epithelial cell proliferation, tight junction integrity, and microbial composition all oscillate in 24-hour cycles governed by the body’s internal clock.11 Sleep is the anchor of that clock. When it is fragmented or cut short, the circadian regulation of gut repair breaks down: barrier permeability increases, the timing of cellular renewal is disrupted, and the microbiome shifts toward dysbiosis

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The 80/20

The research converges on a short list of inputs that actually move the needle, and they map directly onto the variables above.

Fibre is the foundation. Most women are consuming roughly half the recommended 25 to 30 grams per day, which means the bacteria that ferment fibre into the short-chain fatty acids your gut lining depends on are working with a chronically depleted fuel supply.12 Vegetables, legumes, whole fruit, and whole grains are the sources. There is no supplement shortcut that replicates what a varied, fibre-rich diet does to microbial diversity over time.

Fermented foods add the diversity that perimenopause specifically erodes. A 2021 randomised controlled trial published in Cell, comparing a high-fibre diet to a high-fermented-food diet over ten weeks in human participants, found that fermented foods produced significantly greater increases in microbiome diversity.13 Variety of sources matters more than volume of any one: kefir, kimchi, sauerkraut, kombucha, miso. Rotate them.

Stable blood sugar protects the microbiome from cortisol-driven disruption. Protein at every meal, not skipping breakfast: these are glucose levers that are also gut levers.

And sleep is the repair window, not a lifestyle preference. The gut lining cannot sustain itself without it. That is physiology, not self-care advice.

The bottom line

A 2026 review set out to map what happens when declining oestrogen, gut microbiota dysbiosis, and anxiety converge in the same woman at the same time.14 What it found is what we have been describing from opposite ends of the same problem: these are not separate issues requiring separate fixes. They are one system, and the evidence now treats them that way.

Neither is sufficient alone. Chronic dysregulation from the top keeps driving the gut disruption. Chronic gut inflammation from the bottom keeps undermining the nervous system work.

This is why so many women feel like they are doing “everything right” and still not feeling better. The nervous system and the gut are not separate projects. They are one conversation.

And in perimenopause, both sides get louder. The good news is that small interventions compound quickly when they target both ends of the loop simultaneously.

You do not need a complete overhaul.

You need enough safety for the nervous system to stand down, and enough biological support for the gut to stop sending distress signals back upstream.

That is where regulation starts feeling possible again.

Four things to start this week

You don’t need an overhaul. You need two things from each end of the axis, something that calms the system driving the disruption, and something that starts rebuilding what the disruption damaged. That’s it. Start integrating these 4 simple habits into your day this week, and see how it changes the way you feel.

One Screen-Free Meal a Day

Pick one meal, any meal, and eat it without an electronic - phone, TV, Kindle, etc. Just the food. Even if it’s just ten minutes.

This one sounds simple, but it is not easy. Most of us will gravitate toward grabbing our phones to scroll or check messages. But here’s what’s actually happening when you eat distracted: your nervous system stays in low-grade sympathetic activation, your digestive enzymes are suppressed, and your migrating motor complex - the mechanism responsible for clearing bacteria and moving food through your gut - never gets the parasympathetic signal it needs to function properly. You are eating while your gut is not fully engaged. Do that three times a day for years and the compounding effect is exactly what you’ve been feeling. One undistracted meal a day starts to reverse that. Nothing to do with the food, but because of the state you’re in when you eat it.

The 4-7-8 Breath Before You Eat

Before your next meal, before you pick up your fork, take 30 seconds to do this. Inhale for 4 counts. Hold for 7. Exhale slowly for 8. Do it twice.

That’s it.

Here’s why it matters. Your body cannot digest food properly in fight-or-flight. It was never designed to. When your nervous system is in threat mode, digestion is a low priority. Blood flow has already been rerouted, motility has slowed, and your gut is essentially on hold until it gets the signal that the threat has passed. The 4-7-8 breath sends that signal. It activates your vagus nerve, shifts you into parasympathetic state, and tells your gut it’s safe to do its job.

Fermented foods

Add one fermented food you actually like to one meal per day. Kefir in the morning, sauerkraut with lunch, kombucha with dinner. The goal is not quantity. It is consistency and variety over time. You are rebuilding diversity that perimenopause has been quietly eroding.

Savory breakfasts

Put protein at breakfast, every day this week, before anything else. This is the single fastest lever for blood sugar stability, cortisol regulation, and by extension, microbiome protection. It is also the meal most women skip or underserve. Eggs, Greek yoghurt, smoked salmon.

These four things address the system from both ends simultaneously. The nervous system calms. The gut gets substrate to work with. The inflammation has less fuel. The serotonin precursors have a better environment to do their job. This is what working together actually looks like, not two approaches running in parallel, but one system being supported from two directions at once.

References

The full SAM framework (four pillars, the science behind each one, and how they connect) is laid out in the first post.

You have read the sleep post, the fuel post, the exercise series, the glucose data, the biomarkers guide. That is a lot of science. A lot of levers. A lot of things to remember when you are standing in the kitchen at 7am trying to decide what to eat or wondering whether your 9pm workout is actually working against you.

I have a ginormous mindmap. It is my working document, the backbone of everything I write here. Every pillar, every area, every mechanism, every 80/20 distilled into a single navigable structure. It is how I think about the four pillars of SAM and how they connect. And I kept thinking: you should be able to use this too. Not read it as a newsletter once a week and hope it sticks, but actually navigate it, reference it, pull it up when you need it.

So I am building an app.

The goal is simple: an interactive map of the SAM framework that lives on your phone, so that everything you read here becomes something you can find and use in 30 seconds.

It’s the whole point of “Swiss Army Mum”. Having the right tools, the ones that matter and that do most of the work in your pocket, for whenever you need them.

I am not there yet. Building the full mindmap navigator takes time and I wanted to put something in your hands now rather than wait for perfect. So I started with the foundation: a daily bite. One insight from the map, one mechanism explained in plain language, one practical takeaway. Four pillars, rotating daily. 60 seconds.

It is free. No account. No App Store. Install it directly in your browser and it lives on your home screen like any other app.

Get the app

The full interactive mindmap, a weekly planner, a calendar export: those are coming in a paid tier called The Blueprint (working title). It is not live yet, but when it launches, paid Substack subscribers will get it automatically as part of their subscription. I will let you know when it is ready.

Subscribe to be informed when it launches!

Subscribe now

For now, start with one card a day. Let the science show up without you having to go looking for it. And know that what you are installing today is just the first layer of something bigger.

The map is coming.

I need your feedback

One ask: once you have played with it for a day or two, tell me what you think. What works, what does not, what you wish it did. Drop a comment below or hit reply. I read every one.

Last week we established why a philosophy of life matters and why Stoicism earns its place in that conversation. Today: what Stoics actually believed, and the instrument that makes the whole system navigable in real time, in the specific moments that will not wait for you to recall a chapter of philosophy class before you respond.

This post sits in the Purpose and Philosophy of Life area of the Mind Pillar. The previous post established why a philosophy of life matters and why Stoicism earns its place in that conversation; this one gives you the architecture of the system: the four virtues, the dichotomy of control, and the eight-point Stoic Compass that makes the whole framework navigable in real time. The Inner World area, which comes next in the series, is where you develop the self-awareness needed to actually use it.

The First Line That Stopped Me

The first line of Epictetus’s Enchiridion is ten words1.

”Some things are within our power, while others are not.”

No preamble, no scene-setting. Just the observation that changed the architecture of how I think about almost everything. I have been reading around those ten words for years and I am still not done.

Let me tell you why they matter so specifically right now, for the women this platform is built for.

The mental load that lands disproportionately on women, the noticing, the remembering, the coordination, the emotional labour of keeping a household and a family and a career moving simultaneously, is not evenly distributed across what is within your control and what is not.

Most of us are expending enormous energy on things we cannot change: other people’s moods, outcomes we cannot guarantee, standards we have absorbed without choosing. We are running hot on the wrong fuel.

And for women in perimenopause or postmenopause, this is compounded by a physiological reality. As we covered in the Body Pillar series, estrogen’s decline removes a key modulator of the stress response. The result is that things that would not have rattled you at 32 can feel genuinely destabilising at 44. The emotional volume dial is stuck slightly too high. The gap between trigger and reaction has shortened.

Whether you are 37 with two children under five, or 46 navigating perimenopause and an ageing parent at the same time, the first tool is the same: learn to sort what is yours from what is not. Everything else in the Stoic system builds from that.

The Destination: Eudaimonia Is Virtue

The Stoics had a precise answer to what a good life consists of. Eudaimonia, the flourishing life, is not a feeling you chase. It is a condition: the quality of the walking itself, not a reward at the end of the road. And the Stoics were unambiguous about what it consists of: virtue. Not virtue as a means toward happiness. Living virtuously and living well are, in the Stoic account, the same thing described from two different angles2.

This might sound abstract, but it has a very practical implication. It means that the quality of your life is not primarily determined by your circumstances, your job, your relationship, your hormone levels, your age.

It is primarily determined by how you show up inside whatever circumstances you have. That is a genuinely radical claim, and it is also a deeply reassuring one, because it relocates agency somewhere no one can take it from you.

The Four Virtues

The Stoics identified four virtues, inherited from Socrates and developed into a unified system. They are not four separate admirable qualities. They are four aspects of a single integrated character, the Stoics believed you could not truly have one without the others.

Wisdom is the capacity to see clearly: to understand a situation as it actually is, rather than as fear, desire, or exhaustion would have you believe. It is the foundational virtue. Courage without wisdom becomes recklessness. Justice without wisdom becomes rigidity. In daily life it is the pause before the reply. The moment of asking, when your child says something that lands wrong: is this about them, or am I already at the end of my rope? For any woman whose cognitive load is already at capacity, wisdom is the single most valuable thing you can add, because it prevents the worst version of reactions that you will spend tomorrow regretting.

Courage is not the absence of fear. It is the willingness to act rightly when acting rightly costs you something. Most of the time this is not physical courage. It is the courage to say the true thing when the easier thing is available. To say I can’t take that on right now when every instinct is telling you to say yes. To ask for help when you have been performing fine for so long that asking feels like failure. To let your child fail at something when stepping in would be so much easier. Women who have spent years accommodating, absorbing, making things work, often find this the most difficult virtue and the most necessary one.

Justice is your conduct toward others in the daily sense. Treating every person you encounter with fairness and dignity, regardless of their status or your mood or what you stand to gain. Epictetus was direct: we are all citizens of a single human community, and our obligations do not stop at the edges of what is convenient. This includes the child who pushed every button before school. It includes the colleague who takes up more space than they should. It includes yourself, which is where most of us fail the test most consistently.

Temperance is the art of enough. The capacity to act from reason rather than from impulse. What keeps you from being governed by your appetites, for food, for comfort, for the scroll when you should be sleeping, for the yes that buys you goodwill you do not have the energy to back up. Marcus Aurelius wrote about this in relation to the smallest temptations: staying in bed longer than he needed to, seeking approval he knew should not matter3. The battles in his journals were ordinary. That was the point. Temperance is not called for in the great renunciations. It is called for in the moment you open Instagram instead of going to bed, or say yes to something you will dread in a fortnight.

These four are not a checklist. They are a living orientation, practiced imperfectly and daily, and the practicing is the point.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The Sharpest Tool: The Dichotomy of Control

From everything the Stoics built, one insight sits above all others in everyday usefulness. Epictetus placed it at the very beginning of the Enchiridion because he understood that everything else in the system depends on it.

Everything in your life falls into one of two categories: within your power, or not.

Within your power: your judgements, your responses, your values, your effort, your character. Outside your power: other people’s choices, outcomes, your body’s behaviour, the hormonal transition happening whether you invited it or not, what the future will bring.

Between the event and your response sits a gap. Sometimes only seconds wide. Between the permission slip that was not in the bag and the tone of voice you are about to use. Between the email from your manager and the catastrophic story you are already building around it. Between the thing your partner did not do and the resentment that is deciding to become a fight. Between the diagnosis and the fear.

That gap, the Stoics argued, is where all your freedom lives. And most of us never notice it is there.

You have power over your mind, not outside events. Realise this, and you will find strength.

For women in perimenopause or menopause, there is an added dimension worth naming: the heightened emotional reactivity of this transition can make the gap feel like it has disappeared entirely. The reaction arrives before you have chosen it. This is, partly, neurologically accurate, the estrogen buffer that was slowing the threat response has reduced. But the gap is still there. It is just shorter and harder to find without practice. Which is precisely why you build the practice before the crisis, not during it.

William Irvine refines this into a trichotomy worth keeping in your back pocket: things fully within your control, things you can partially influence, and things entirely outside your control4. For what is fully yours: invest completely. For what is partially yours: put in your best effort and accept the outcome. For what is not yours at all: practice acceptance without resistance, not because resistance is weak, but because it is wasteful. It costs you twice: once in the futile effort, and again in the suffering that follows.

When you use these instruments consistently, something begins to develop that no single tool can produce on its own. The Stoics called it apatheia, not apathy, but freedom from the destructive emotions that arise when we make false judgements about what is truly good and bad. Inner steadiness that does not depend on circumstances being comfortable. The keel that holds regardless of the weather outside. It is not installed. It is grown, through practice, over time.

The Stoic Compass

Here is the practical problem with most philosophy: you can read an entire book on managing anger and still, in the moment when someone says the thing, the dismissive colleague, the teenager who knows exactly where to push, the appointment that went badly, none of the reading surfaces. What surfaces is the reaction.

The Stoic system does not have this problem, if you use it right. The beauty of Stoicism as a philosophy of life is that it is eminently practical. However, at least for me, the concepts need a spatial home. Something visual enough to reach for in real time, without having to hold the whole architecture in your head.

That is what the Stoic Compass is.

The visual at the heart of this series is a wind rose: the eight-pointed navigational instrument that has guided sailors for centuries. The idea of giving the Stoic concepts a spatial, visual home was inspired by the work of Stephen Dewitt, a cognitive psychologist whose wristwatch framework showed how powerfully these tools hold together when anchored to a structure you can reach for instinctively5. The compass builds that insight into the wind rose.

Eight points. Two groups.

The four cardinal points are the virtues: Wisdom, Courage, Justice, Temperance. The destinations, what you are aiming to embody. There are no compass letters on this wind rose. No prescribed N, E, S, W. Which virtue is your true north at any given moment is something only you can determine. The compass does not prescribe. It orients.

I also come from the southern hemisphere, so I am particularly sensitive to the South as a cardinal point. You may come from the East. The tool is yours to use.

The four intercardinal points are the practical tools (only four out of a plethora coming from Stoicism), what you reach for when a specific situation demands a specific response.

Mind the Gap sits between Wisdom and Courage. The space between what happens and how you respond. This is the first tool you reach for in any difficult moment. Pause. Notice what you are telling yourself. Ask whether it is accurate before you act on it. This is the gap where your freedom lives, even when the gap feels very small.

The Trichotomy of Control sits between Wisdom and Temperance. After the gap has created space to think: is this fully mine, partially mine, or not mine at all? The answer determines where to direct your energy. Fully mine: invest completely. Partially mine: best effort, release the outcome. Not mine: practice acceptance.

Negative Visualisation sits between Courage and Justice. The deliberate practice of imagining the loss of what you value, a relationship, your health, an ordinary Tuesday evening that, if you stopped to notice, contains more than enough. Not pessimism. A deepened gratitude for what is present, and an honest preparation for difficulty before it arrives. A proactive tool, built into the day before the crisis hits.

The View from Above sits between Justice and Temperance. The deliberate act of zooming out, from the room to the city, from the city to the planet, from the planet to the arc of time. Reach for this tool when a situation has grown larger inside your head than it is in the world. The sleepless night that felt catastrophic at 3am looks different in the morning light. The argument that consumed a week looks different from the perspective of a year. Most of what presses on us is, from the long view, small.

How to Use the Compass

You do not need all eight points at once. Most situations call for one or two.

The forgotten permission slip, the tone escalating before school: Mind the Gap first, then Justice, am I treating this child as a full person or as the source of this morning’s problem? The project at work that depends on a colleague who keeps dropping the ball: Trichotomy of Control, what is fully mine here, what is partially mine, and what do I need to release? The sleepless night: Trichotomy again, some of the wakefulness is partially mine (the late screen, the wine, the unfinished conversation); some of it is the hormonal transition and is simply not mine. The relationship you realise you have been taking for granted: Negative Visualisation, today, before you need it. The anxiety that has expanded to fill a week: View from Above.

The compass gets more instinctive the more you reach for it. Small situations are the right place to start, that is where the habit forms.

One practice worth adding: Seneca described a nightly habit of self-examination, three questions before sleep: where did I fall short today, where did I act well, what will I do differently tomorrow. Two minutes. No journal required. This is not a crisis tool. It is what makes the compass yours over time.

The 80/20

Pick one intercardinal tool this week and use it once a day. The Trichotomy of Control is the easiest starting point, it requires no particular calm to apply, and it gives you something concrete to do with anxiety rather than just sitting in it. When something presses on you today, sort it before you do anything else: fully mine, partially mine, not mine at all. The answer tells you where to put your energy. Everything else in the compass deepens from there.

A Note on Learning Stoicism

One post is not nearly enough. What you have here is the skeleton: the destination, the four virtues, the sharpest daily tool, and the compass to navigate by. But the Stoic system has been tested across every imaginable human situation, and the real depth comes from applying it to specific moments, not just understanding it in the abstract. If this landed for you and you want to go further, William Irvine's A Guide to the Good Life is the best first book, full stop. It is readable, practical, and written by someone who actually lives by these ideas rather than just studying them. Massimo Pigliucci's How to Be a Stoic goes deeper into the philosophical machinery for anyone who wants to understand not just what the Stoics said but why it holds up under scrutiny.

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

If the compass landed for you, I’d be grateful if you forwarded this to someone who might need it, or hit the ♥️ or ↻ Restack button. It helps more people find this space.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

References

We opened the Mind Pillar last week. Today we go deep into the first area: Purpose and Philosophy of Life. It is the one I have been building toward since the beginning, and the one that, for me, changed everything else.

The Body Pillar addresses the physiological foundation (sleep, fuel, movement). The Mind Pillar addresses what sits above it. And it turns out the two are less separate than we tend to assume. Ryff's research links purpose in life directly to lower cortisol, better immune function, and faster recovery from adversity. A philosophy of life is not a luxury for the well-resourced. It is a measurable protective factor for long-term health.

This post sits in the Purpose and Philosophy of Life area of the Mind Pillar. If the Mind Pillar is the floor of the building you actually live in, Purpose and Philosophy is the room where you decide what the building is for: what you value, how you want to move through the world, and the framework that lets you filter competing demands without just reacting to whichever is loudest. The Inner World area builds directly from here, because knowing yourself well enough to actually live by a philosophy you have chosen is itself a skill that has to be developed.

The Body Pillar Wasn’t Enough

I spent months building out the Body Pillar, sleep, fuel, exercise, metabolic health. I tracked my glucose. I restructured my training. I fixed my sleep. I did all of it, and I felt physically better than I had in years.

And I still felt off.

Still snapping at the people I loved. Still getting to the end of a packed day and not being able to name a single thing that felt genuinely mine. Still making decisions on autopilot, defaulting to whatever was most urgent rather than whatever actually mattered, and then wondering, at 10pm when the house was finally quiet, why I felt vaguely hollow despite having been busy every minute.

The Body Pillar gave me energy. It didn’t give me a why.

Here is what I didn’t fully appreciate until I started researching the Mind Pillar: this gap, between functioning well physically and feeling well in a deeper sense, is not unique to any particular life stage. It shows up at 36, exhausted after a second maternity leave and not sure who she is outside of work and children. It shows up at 42, watching the career she built no longer feeling like it fits. It shows up at 47, when the hormonal transition adds its own particular chaos to a life that was already at capacity.

The physical changes of perimenopause do sharpen this gap, estrogen was doing a remarkable amount of cognitive and emotional administrative work behind the scenes, modulating serotonin, supporting memory, regulating the stress response, and when it starts to decline it takes some of that scaffolding with it. But the deeper thing, the feeling of reacting rather than choosing, of running without a map, that is not a hormonal symptom. It is a human one. And the Body Pillar, however solid, cannot fix it.

That is what a philosophy of life addresses.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

What a Philosophy of Life Actually Is

Most of us live by default. We absorb values from our culture, from our parents, from whoever shouts loudest on social media, without ever consciously deciding whether those values are actually ours. We optimise for a life we never deliberately designed, and wonder why it doesn’t fit quite right.

We usually don’t worry about one specific thing. We worry about everything, because when you don’t have a clear internal compass telling you what actually matters, every demand has equal urgency. The work inbox and the permission slip and the conversation with your mother and the thing you said to your partner three weeks ago and whether you are raising your children well enough all compete at the same volume. There is no framework for filtering. You have no working system for deciding what actually matters.

A philosophy of life is that framework. Not an abstract set of beliefs for academics to argue about. A working system for what is worth wanting, what is worth pursuing, and how to behave when things go wrong.

The philosopher William Irvine defines it as a coherent set of values that functions as both a map and a compass1. The map tells you where you are going. The compass keeps you oriented when the weather closes in and the path disappears.

Without one, you are not directionless by accident. You are directionless by design. Our culture has a vested interest in keeping you uncertain about what you actually want. Dissatisfied people consume more. People who don’t know their values can be convinced to want almost anything, including a new supplement stack, a different exercise programme, a course that promises to fix the thing that doesn’t actually need fixing.

A philosophy of life is, among other things, an act of resistance.

The ancient Greeks had a word for what we are actually after: eudaimonia. Usually translated as happiness, but the translation misleads. A closer rendering is flourishing: the condition of a life lived well, in accordance with what you actually are and what you are actually capable of. Not a feeling that arrives and departs. A way of living.

The research consistently identifies purpose in life as one of the strongest predictors of psychological well-being, and specifically links it to better outcomes on the exact metrics that matter most to women in midlife: lower cortisol, better immune function, faster recovery from adversity2.

The question is which framework to choose.

Why Stoicism

There are many philosophies of life worth considering. The question is which ones hold up under real conditions, including the conditions most of us are actually living in.

A woman managing a full-time job, a family, ageing parents, and a body that is renegotiating its terms with her does not need a philosophy that works in quiet. She needs one that works in the school run, in the meeting she is dreading, in the moment she realises she has snapped again and doesn’t know why.

Stoicism fits that description better than almost anything I have found. It has been tested not in university seminars but across 2,000 years of actual human difficulty: grief, loss, political chaos, the impossible behaviour of other people, the fear of death, the feeling that time is running out faster than expected. Its practitioners were not people writing from positions of ease.

Three of them have shaped my thinking above all others. Not because they are the most academically important Stoics, but because together they demonstrate something essential: this philosophy works across every condition of human life.

Epictetus was born a slave. He had no property, no freedom, no political power, and every external reason to despair. He developed one of the sharpest practical philosophies in history anyway3. What moves me about Epictetus is not the philosophy itself. It is that he arrived at it from a starting point of absolute deprivation, and that his insights are no less sharp for it. The fact that his philosophy survived at all is a kind of proof of concept.

Marcus Aurelius was a Roman emperor who kept a private journal of his attempts to apply Stoic principles to the impossible demands of governing an empire while managing his health, watching his children die, and sitting with his own mortality. He never intended it to be published. We call it the Meditations, and it reads, two thousand years later, like someone talking to themselves in the early hours of the morning, trying to remember what they actually believe4. Every time I read it I think: this is a person who is tired and overwhelmed and still choosing, deliberately, to try to be better than circumstances require (all of this while being arguably the most powerful person in the world at the time. He could’ve done what he wanted).

Seneca was a statesman who operated at the centre of Roman imperial power. He was brilliant, politically compromised, and entirely clear-eyed about the gap between how he lived and how he believed one ought to live. His Letters to Lucilius are among the most honest documents in the history of moral philosophy: a thinker genuinely trying to do better, in public, without pretending to have already arrived5. He wrote about anger, about grief, about the way we squander time as though we have unlimited supplies of it. Two thousand years on, he sounds like someone you might know.

A slave. An emperor. A statesman who questioned himself constantly. The same philosophy, applied to radically different lives.

This Is Not About Cold Stoicism

I want to address the thing that puts people off.

The word stoic, in modern use, has drifted so far from its origins that it now means something like emotionally unavailable. The stiff upper lip. The person who doesn’t cry at funerals. That is not what this philosophy is.

What Stoicism actually teaches is not the suppression of emotion. It is a different relationship with emotion, specifically, with the emotions that arise from false beliefs about what is truly good and bad. Fear of things that are not actually threatening. Rage at things that were always outside our control. Craving for things whose acquisition would not make us whole.

In practice, this shows up constantly in the life of a busy woman with children. The rage at the school run when you are already running late and someone has forgotten their bag, again. The anxiety about the email from your manager that probably means nothing but that you have re-read six times. The resentment that builds when you are doing the invisible work that no one notices and you cannot even fully articulate without feeling like you are complaining. None of these feelings are irrational. But most of them are being driven by an interpretation of events that deserves examination before you act on it.

Having a sorting tool, a framework for distinguishing what is genuinely worth your emotional energy from what is not, is not a luxury.

Compatible With What You Already Believe

One practical note before we go further. Stoicism does not require any particular set of metaphysical beliefs. You do not need to believe in God, or reject the idea of God, to use it.

The Stoic concept of the Logos, the rational order underlying the universe, maps naturally onto providence for a believer, and onto the rational laws of cause and effect for an atheist or agnostic. The philosopher Massimo Pigliucci makes this point clearly6. The Stoics themselves held a range of views on the theological question and considered it, ultimately, less important than the practical one: how to live.

Modern psychology arrived at the same place by a different route. In the 1950s and 60s, Aaron Beck developed Cognitive Behavioural Therapy, now one of the most evidence-backed psychological treatments in existence7. Its central insight: it is not events that cause our distress, but the interpretations we place on them. Epictetus said exactly this two thousand years earlier: “People are not disturbed by things, but by the views which they take of things.” CBT was built, in part, on Stoic foundations. When you use CBT techniques, you are using ancient philosophy that has been clinically validated.

Why This Matters Specifically After 35

The 35-to-55 window is, for most women, a period of compounding demands and shifting identity. The small children who absorbed everything now have opinions and schedules of their own. The career is either pulling hard or asking you to question whether it’s what you actually wanted. The relationships that felt solid are being tested by years of putting everything else first. And often, somewhere in the background of all of it, a quieter question is starting to form: is this the life I actually chose, or just the one that accumulated?

That question is not a crisis. It is an invitation. But without a framework to meet it, it tends to become background noise: present enough to drain you, not specific enough to act on.

Women in midlife also often find themselves in what the researchers call the sandwich generation, children still needing them, parents beginning to need them too, with their own needs somewhere near the bottom of the list. Having a clear sense of your own values does not make that structural pressure disappear. But it does mean you make better decisions inside it, instead of just reacting to whoever needs you loudest right now.

The goal is not peak performance. It is feeling like yourself again. A philosophy of life is, at its best, the most direct route there.

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building a life with more intention takes a village. If something resonated, I’d be grateful if you forwarded this to someone who might need it, or hit the ♥️ or ↻ Restack button. It helps more people find this space.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

References

Before we get into what the Mind pillar is, I want to take a moment on why it exists separately from the Body pillar at all. Because the honest answer is: it almost didn’t.

When I built out the Body pillar, covering sleep, movement and nutrition, I kept telling myself that was the foundation. Get the basics right. Everything else follows. And I believed it, for a while.

The body was taken care of. The mind was still feral.

The Romans had a phrase for this: mens sana in corpore sano. A healthy mind in a healthy body. It is usually quoted as a goal, a thing to aim for. What gets less attention is the implication underneath it: the two are not the same thing. You can have one without the other. And having only one is not enough.

This is actually what the research predicts. The biopsychosocial model, which underpins modern medicine and psychiatry, is explicit on this point: biological, psychological and social factors all interact in health and illness1. You cannot fix one layer and call it done. The Body pillar and the Mind pillar are not competing frameworks. They are two floors of the same building. The body is the ground floor: it has to be structurally sound or nothing above it works. But you do not live on the ground floor. You live upstairs.

That is where this pillar begins.

This post is the blueprint for the Mind Pillar, the second of the four pillars and the most personal to write. The Body Pillar covers the physical foundations: sleep, fuel, and movement, the infrastructure that keeps the machine running. The Mind Pillar picks up where the Body leaves off, covering the four areas of mental well-being that decades of research consistently identifies as most actionable: Purpose and Philosophy of Life, Inner World, Emotional Resilience and Stress Management, and Connection and Relationships.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

I Used to Think Taking Care of My Mental Health Meant Not Having a Breakdown

If I was functioning: working, showing up for people, getting through the week without anything catching fire, I was fine. Mental health was something you only needed to think about when something went wrong. And since nothing had gone catastrophically wrong, I didn’t think about it much.

Then I started building this framework and kept bumping into the same uncomfortable question: what about everything that isn’t the body?

Because there’s a version of me that sleeps eight hours, exercises regularly, eats well, and still feels vaguely lost. Still snaps at the people she loves. Still spends Sunday evenings with that low-grade hum of dread.

That version of me needs something the Body pillar can't fully give her. She needs the Mind pillar.

This post is the blueprint (the why and the what) before we go deep into each area. If you want the practical stuff, it’s coming. But the framework matters first. When you understand what mental well-being actually is, what it’s made of, what shapes it, and what you can and can’t control, the work starts to make a lot more sense.

What Does “Mental Well-being” Actually Mean?

Most of us grew up with a binary understanding of mental health: you either have a problem, or you’re fine. The absence of a diagnosis meant you were okay. “I’m not depressed” was the same thing as “I’m mentally healthy.”

The World Health Organisation draws a very different picture. Mental health, they say, is a state of well-being in which individuals can cope with life’s stresses, realise their abilities, and contribute to their community2.

It is not the absence of illness. It is the presence of something positive, something active, something that can grow or erode depending on how you tend to it.

That reframe matters. It shifts mental health from a threshold you either cross or don’t, into a landscape you actually live in. And it raises a much more interesting question than am I okay?

It raises: am I actually well?

Researchers have been trying to answer that question for over eighty years.

What the Research Says

The science of mental well-being is richer and more converging than most people realise. Since the 1940s, psychologists, psychiatrists and public health researchers have been building frameworks for what a mentally healthy life looks like. They come from different traditions and emphasise different things. But when you lay them side by side, a remarkably coherent picture emerges.

Here are the major frameworks worth knowing.

Maslow’s Hierarchy of Needs (1943) is probably the one you’ve seen on a poster. A pyramid: physiological needs at the base, then safety, then love and belonging, then esteem, and finally self-actualisation at the top3. The intuition (that basic needs have to be met before you can pursue growth) is genuinely useful. The critique is that life is messier than a pyramid. Modern research finds weak empirical support for the strict prioritization4.

Jahoda’s Ideal Mental Health (1958) was the first serious attempt to define positive mental health: health itself, not just the absence of illness. She proposed six criteria: self-acceptance, personal growth, integration (the capacity to resist stress), autonomy, accurate perception of reality, and environmental mastery5. Ambitious, perhaps idealistic, but remarkably ahead of its time.

Ryff’s Psychological Well-Being model (1989) took Jahoda’s ideas and built something empirically robust out of them. Six dimensions: autonomy, environmental mastery, personal growth, positive relations with others, purpose in life, and self-acceptance6. Backed by over a hundred studies across cultures7. Of all the frameworks here, this is the one I find most useful as a map.

PERMA (Seligman, 2011) comes from positive psychology. Five elements: Positive Emotion, Engagement, Relationships, Meaning, and Accomplishment8. Widely used in schools and workplaces. Its critics argue it may overlap heavily with general life satisfaction, but as a practical lens, it holds up well. Seligman himself revisited the evidence in a 2018 paper9.

Self-Determination Theory (Deci and Ryan, 1985) argues that there are three fundamental psychological needs: autonomy (feeling like your choices are genuinely yours), competence (feeling effective), and relatedness (feeling connected to others)10. When these are met, people thrive. When they are chronically frustrated, they don’t. Ryan and Deci’s 2012 cross-cultural review confirmed this holds across very different societies11.

The Biopsychosocial Model (Engel, 1977) is the model that underpins modern medicine and psychiatry. Health, mental health included, arises from the interaction of biological, psychological and social factors12. Nothing exists in isolation. This is the same principle that makes the Body pillar and the Mind pillar inseparable, even when we treat them in different posts.

Ecological and Social Determinants Models (Dahlgren and Whitehead, 1991) zoom out the furthest. Think concentric rings: at the centre, the individual. Then social networks. Then living and working conditions. Then the broader socio-economic and cultural environment13. Mental health is shaped at all of these levels simultaneously, a framework now standard in public health policy worldwide.

The Frameworks Side by Side

What Keeps Coming Up

When you look across all of these frameworks, certain themes keep surfacing. Researchers label them differently, but the underlying clusters are consistent. They fall into seven broad domains:

• Biological: physical health, sleep, stress physiology, nutrition

• Psychological: self-awareness, emotional regulation, resilience, purpose, autonomy

• Social: relationships, belonging, support networks

• Environmental: safety, housing, access to resources and green space

• Behavioural: movement, rest, constructive leisure, daily habits

• Cultural and economic: identity, belonging, financial security, freedom from discrimination

This map aligns closely with the WHO’s characterization of mental health determinants14.

Seven domains. All real. All evidenced. Not all equally within reach, and that matters, so let’s be honest about it.

What the Mind Pillar Won’t Cover And Why

I want to be straightforward here, because wellness content often isn’t.

The biological domain is already handled in the Body pillar. Sleep, nutrition, movement, the biological stress response: those live there. The mind-body connection is constant and real, and I’ll come back to it throughout this series. If you haven’t read those posts yet, start here.

Two more domains are largely outside our personal control. The environmental domain (safe housing, stable neighbourhoods, access to nature) and the cultural and economic domain (income, employment, freedom from discrimination and inequality) are among the most powerful determinants of mental health in the research. The evidence is unambiguous. The 2018 Lancet Commission on Global Mental Health was explicit: socioeconomic conditions are upstream determinants that individual-level interventions cannot substitute for.

I’m not going to pretend otherwise, and I’m not going to offer you a journaling prompt as a solution to structural inequality. These factors matter enormously. They set the conditions in which everything else we talk about happens. If your circumstances are genuinely constrained in these ways, that is not a personal failure and it is not something a wellness framework can fix.

What the Mind pillar can offer is meaningful work on the dimensions that remain. That’s not nothing. For most of us living reasonably stable lives, it’s quite a lot.

The 4 Areas

Here’s where the research lands, distilled into four areas that are meaningful, actionable and deeply interconnected. The order matters: each one builds on the last.

1. Purpose and Philosophy of Life

Everything starts here.

Before you can manage stress well, or know yourself, or build meaningful relationships, it helps enormously to have some sense of why. What you value. What kind of life you’re trying to live. What you believe, loosely, about how a person should move through the world.

This isn’t about having a five-year plan. It’s about having an orientation.

Ryff’s research links purpose in life to measurable physical outcomes: immune function, cortisol levels, recovery from illness. Seligman places Meaning at the centre of his PERMA model. Self-Determination Theory identifies autonomy (the sense that your choices are genuinely an expression of your own values) as one of the three most fundamental human needs.

This is also where I want to introduce something that will thread through the entire series: Stoicism. Not as a philosophy degree. As a practical toolkit that is nearly 2,000 years old and still quietly radical.

More on this in the dedicated posts. Consider this the seed.

2. Inner World

If Purpose and Philosophy is your why, the Inner World is your who.

This is the quieter area, and harder to talk about without sliding into therapy-speak or generic mindfulness content. So let me try a different angle.

Every other area here requires some basic capacity to actually know what you’re feeling, thinking and needing. Without that inner awareness, stress management becomes distraction, purpose becomes performance, and connection stays surface-level. The inner world is the foundation everything else is built on.

Jahoda was among the first to name this: what she called self-acceptance and accurate reality perception. Ryff built an entire dimension around autonomy: not independence from others, but a stable internal reference point. The ability to know your own mind well enough that you’re not entirely at the mercy of every external signal.

Stoicism returns here too. Marcus Aurelius didn’t just have a philosophy of life. He practiced radical self-examination. His Meditations were never meant to be published. They were private notes he wrote to himself, holding his own thoughts up to scrutiny. That practice (turning inward with honesty and without judgment) is exactly what this area is about.

In practice, it looks less like formal meditation and more like: Do you know when you’re actually overwhelmed versus when you’re bored? Do you know what genuinely restores you versus what just numbs you? Can you sit quietly for ten minutes without reaching for your phone?

Most of the activities I’d put in the wholesome activities post, the slow, solitary, repetitive ones, are inner world work in disguise. Knitting is thinking. Walking without a podcast is processing. Baking from scratch is attention practice. You don’t have to call it mindfulness for it to function like mindfulness.

3. Emotional Resilience and Stress Management

This is the coping dimension, and I want to be careful not to flatten it.

Emotional resilience doesn’t mean not feeling hard things. The research on emotional suppression and avoidance is clear: it backfires, often badly. Resilience is not a wall you build against difficulty. It’s a capacity to move through difficulty (to feel it, process it, and return to equilibrium without getting permanently stuck).

Which brings me to something I want to address directly, even though I know it’s all over the internet right now: nervous system regulation.

The reason it’s everywhere is not because it’s trendy. It’s because the underlying biology is real. When you encounter stress, your autonomic nervous system activates a threat response. The problem isn’t a single stressful event. The problem is chronic activation: when the nervous system never fully returns to baseline, it quietly corrodes mood, cognition, sleep, relationships and physical health over time. Chronic stress is identified by the WHO as one of the primary risk factors for mental ill-health.

So yes, learning to actually regulate your stress response matters. But what does that look like in practice?

This is where restorative activities come in, and I want to make a serious case for them rather than just a cosy one. Knitting, baking, reading, walking the dog, tending a garden: these are not guilty pleasures you earn after being productive enough. The WHO identifies constructive leisure, alongside sleep, movement and diet, as a genuine protective factor for mental health. PERMA calls this Engagement: the flow state where you’re absorbed enough that the inner critic goes quiet. It is one of the most underrated stress regulation tools available, and it costs almost nothing.

I have a whole post coming on this including my own list of wholesome activities and why they actually work.

4. Connection and Relationships

Saving this one for last not because it’s least important (it may be the most) but because it’s the one most of us quietly underestimate in our own mental health accounting.

Loneliness is not a soft problem. A large-scale study published in JAMA Network Open found that loneliness was strongly associated with depressive symptoms, anxiety and suicidal ideation15. Ryff’s positive relations dimension is one of the strongest predictors of long-term well-being in her model. Self-Determination Theory names relatedness as one of the three fundamental human needs: not a nice-to-have, but a core driver of psychological health.

And yet this is the area most of us let erode most quietly. Friendships drift. We get busy. We tell ourselves we’re introverted. We mistake constant digital contact for actual connection.

The quality of your relationships, not the quantity, is one of the most powerful levers you have access to. That includes the relationship you have with yourself, which loops right back to the Inner World area. These four dimensions are not a checklist. They’re a system.

We’ll get into what good connection actually looks like to build and maintain, especially as busy adult women, which is a conversation that doesn’t get had nearly enough.

What’s Coming

Four areas. Four dedicated series. Here’s the road map:

• Purpose and Philosophy of Life: values, meaning-making, an introduction to Stoicism as a practical tool, and what living deliberately actually looks like day-to-day

• Inner World: self-awareness, solitude, and the quiet practices that build an internal reference point

• Emotional Resilience and Stress Management: including a full post on wholesome activities and why the research backs them more than you’d think

• Connection and Relationships: the quality of your bonds, and what it genuinely takes to maintain them

Thank You for Being Here

If you made it this far, genuinely, thank you. This series is something I’ve been building for a while, and the Mind pillar is the one that feels most personal to write. Not because I have it figured out, but because I really don’t, and I think that’s exactly why it’s worth going through together.

If this post resonated with you, the best thing you can do is share it with someone who might need it: a friend who’s been running on empty, or anyone quietly wondering if there’s more to mental health than just getting through the week.

Share Swiss Army Mum

And if you’re not subscribed yet, this is a good moment. The next posts in this series are going to get a lot more specific and a lot more honest.

See you in the next one.

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

References

A few months ago, I published the sleep blueprint. I told you the truth: sleep is the non-negotiable foundation. The glymphatic system clears waste from your brain overnight. REM sleep processes your emotions. Miss enough of it and your biology ages faster than your calendar.

And then I added a footnote, almost as an aside.

If you’re in the thick of early motherhood, that information might feel like an accusation. Here’s what I want you to know: we are biologically designed to rear children.

That means not sleeping well for a period of your life. It’s temporary.

Several of you wrote in asking a version of the same question: if sleep is so critical, why does nature build new mothers to be chronically deprived of it? Was evolution asleep on the job?

This post is the answer to that question.

It’s a Zoom post. No protocols. No hacks. Just the mechanism behind why this happens, what your biology is actually doing in those exhausted first months, and why the science is more reassuring than the headlines suggest.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The Paradox

Start with the stakes.

Mothers sleeping fewer than seven hours a night at six months postpartum show epigenetic markers that suggest their cells are between three and seven biological years older than those of better-rested peers1. That’s not a typo. Six months of poor sleep can age you, at the cellular level, by up to seven years.

And yet: every mammal on earth does this. Every new mother wakes through the night. Every marmoset, every rat, every wolf mother rearranges her sleep for her offspring. This has been happening for tens of millions of years, across wildly different species and environments.

If postpartum sleep disruption were simply a mistake, selection pressure would have fixed it by now. It hasn’t. Which means either nature is extraordinarily indifferent to maternal health, or something more interesting is going on.

The evidence points to something more interesting.

This Is Not a Bug

Sleep fragmentation in new mothers is not a failure of the system. It’s a feature of a different system, one built around infant survival rather than maternal optimization.

Think of it like a factory that temporarily redirects its energy grid. Under normal conditions, the factory runs full production for itself: building, repairing, maintaining. When a critical external demand arrives, power gets redirected. Output elsewhere drops. Efficiency suffers in some departments. But the priority gets met.

Your biology, in early motherhood, is running a version of that redirect.

The Attentional Shift

The first thing sleep deprivation does to new mothers is not what it does to everyone else.

In most people, sleep loss blunts attention, slows reaction time, and creates a general fog. In new mothers, something more specific happens. A study of first-time mothers found that those sleeping fewer than seven hours a night were significantly faster and more accurate when responding to infant-related cues compared to self-related ones2. Well-rested mothers showed no such bias. Their attention was distributed more evenly.

The sleep-deprived mothers, in other words, had been recalibrated. Cognitive resources were scarce, so the system redistributed them. Baby first. Everything else later.

This is not a metaphor for maternal love. It’s a measurable neurological shift. When you’re running on four hours of fragmented sleep and your infant makes a sound, your brain is primed to respond before you’re consciously aware of it. That’s the system doing exactly what it was built to do.

It’s worth noting the flip side: untreated insomnia in parents, the kind that persists beyond early infancy without that protective biological context, is linked to less sensitive caregiving3. The adaptive vigilance of early postpartum sleep loss is not the same thing as general sleep deprivation. The biology has a context.

Oxytocin: The Stress Buffer

New mothers also have a hormonal advantage that non-mothers don’t.

Oxytocin, released during breastfeeding and skin-to-skin contact, is best known as a bonding hormone. But it’s also anxiolytic: it actively dampens the stress response. Women with higher oxytocin levels before a sleep disruption event showed measurably less mood impairment the following day compared to women with lower levels4.

This is not a small effect. It suggests that the same physiological process that feeds your baby is also quietly buffering you against the emotional consequences of the broken night that feeding caused.

Prolactin works alongside it. The hormone that drives milk production peaks at night and appears to promote deeper sleep during the windows when sleep does happen5. Your body seems to be building in a mechanism: wake up to feed, but when you do sleep, make it count.

The result is a sleep architecture that looks terrible on paper but is more functional than the raw numbers suggest. You’re getting less sleep. You’re also getting a hormonal environment that is, to some degree, purpose-built to help you cope with getting less sleep.

The Evolutionary Logic

Zoom out further and the picture gets more interesting.

Infant sleep disruption is almost certainly adaptive for the infant as well as for the mother. Frequent night waking suppresses ovulation through elevated prolactin, extending the inter-birth interval and concentrating parental investment on the current offspring6. One model proposes that postpartum depression, when it co-occurs with high infant night-waking, may function as a signal that triggers support-seeking from others in the social group, in effect broadcasting that the mother is overloaded and needs help7.

These are speculative frameworks. They’re evolutionary hypotheses, not established mechanisms. But they point toward the same conclusion: this system was not designed to be endured alone.

Marmoset mothers with newborns are awake more than three times as often at night as mothers without infants, and this elevated wakefulness persists for at least nine weeks8. That’s not a human quirk. It’s a mammalian pattern.

And in all mammalian species that have been studied, the solution to that pattern has never been individual maternal toughness. It has been social support.

The Modern Mismatch

Here’s where things get uncomfortable.

For most of human evolutionary history, new mothers were not doing this alone in a darkened room in a nuclear family household. They were embedded in multigenerational groups where night duties were shared, where other adults heard the infant, where sleep could be recovered in distributed fragments across a social network.

The anthropological evidence suggests that co-sleeping, alloparenting (care by non-parents), and communal overnight support were the norm rather than the exception in ancestral environments9. The biology adapted to a context where help was available.

Modern isolation is the mismatch. The physiological machinery is not designed to run indefinitely without external support. When researchers look at what actually reduces the health consequences of postpartum sleep loss, the most consistent finding is partner and family involvement in night care. Even occasional relief, a single long block of sleep, a shared feed, a nap while someone else is present, meaningfully reduces sleep debt and its downstream effects.

The answer to the postpartum sleep paradox is not that your body is broken.

It’s that your body was built for a village.

What This Means Practically

A few things follow from the biology.

The fragmentation itself may be less damaging than it looks. One controlled experiment found that a single night of simulated postpartum-like awakenings, three interruptions of roughly thirty minutes each, did not impair psychomotor performance the following day despite subjective reports of poor sleep10. Acute fragmentation, in a context where the rest architecture is otherwise intact, appears more tolerable than chronic total sleep restriction. This doesn’t mean sleep deprivation isn’t real. It means the body has some short-term buffering capacity that most of us don’t give it credit for.

Sleep timing matters more than most new parents realise. Going to bed earlier and keeping a consistent bedtime, even if wake times are unpredictable, is associated with measurably better daytime performance.

If you can do one thing, consistency is it.

Breastfeeding doesn’t shorten your sleep. A large longitudinal study found that breastfeeding itself was not independently associated with reduced maternal sleep duration. What correlated with shorter sleep was the number of feeds.The mechanism is the number of wakings, not the method of feeding. This matters because the oxytocin and prolactin benefits of nursing are real, and the decision to breastfeed should not be driven by fear that it’s making the sleep worse.

The biology is temporary. The cellular aging data is real, but it reflects a specific window. As infant sleep consolidates, the maternal system recovers. The redirect ends, the factory returns to full production, and the biological clock can be wound back. Early postpartum sleep loss does not permanently compromise your health if it is followed by recovery.

And if the postpartum months were brutal for you, physiologically brutal, not just hard in the way people warn you it will be hard: that is data. It means you were running the system without sufficient support, in a context it was not designed for. That’s not weakness.

It’s a modern structural problem wearing the costume of a personal one.

A Note to Non-Mothers

This post is about postpartum biology, but the mechanisms are relevant more broadly.

Oxytocin as a stress buffer during sleep disruption. Circadian consistency as a lever for function under fragmentation. The role of social support in recovery. These are not exclusive to new parents. They are general principles about how sleep interacts with stress, hormones, and social context.

If you’re in a period of disrupted sleep for any reason, the lesson from postpartum biology is not that you should just push through. It’s that your body has more adaptive capacity than you think, that consistency matters more than total hours in the short term, and that trying to do it alone makes everything harder than it needs to be.

Your Turn

Were you a new parent who felt the weight of sleep research as guilt rather than guidance? Or did you come through it and want to share what actually helped?

Drop a comment. I read every one.

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space and build sustainable health without the overwhelm.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

References

If you’re new here, hi!

Swiss Army Mum is a simple, science-based wellness system for busy women. Four pillars. No overwhelm.

Not every tool. Just the right ones.

A few years ago, I had a routine physical. Everything came back normal. My doctor was pleased. Fasting glucose, fine. Cholesterol, fine. Blood pressure, fine. “You’re in good health.”

I walked out feeling like I should be relieved. But something was nagging at me.

My recovery from hard workouts was slower than it used to be. I needed more sleep to feel the same level of alert. My body composition had shifted even though my diet hadn’t. I was slower to learn new physical skills than I had been at 30. Nothing was wrong. But something had clearly changed.

Here’s what my doctor didn’t say, because it is not what annual physicals are designed to tell you: I was already years into physiological decline across multiple systems. Not diseased. Not even close. But measurably below where I had been at my biological best.

A perspective paper published in Aging and Disease in early 2026 puts a name to this state. It’s called Peakspan1.

I want to be clear about what this paper is, and what it isn’t. And then I want to show you why the data behind the concept fits with everything in this system.

The Paper and Its Limits

Zhavoronkov, Ying, and Wilczok introduce Peakspan as a framework: the age interval during which a person maintains at least 90% of their peak functional performance in a specific domain. It is a perspective piece, not a clinical trial. No new data. No methods section. The bar for peer review is lower than for original research.

The lead author, Alex Zhavoronkov, runs Insilico Medicine, an AI drug discovery company whose business model rests on biological aging tools. The paper’s proposed solutions reference his company’s products by name. He discloses this. It does not invalidate the framework, but it means you should read it as a commercially-adjacent proposal, not a neutral scientific report.

The 90% threshold is also, by the authors’ own admission, arbitrary. “Provisional,” they write. The headline table of Peakspans across organ systems, which has been widely shared, is explicitly labeled “for illustrative purposes rather than as precise quantitative estimates.”

So: not a breakthrough discovery. Not a validated clinical tool. The hype is ahead of the evidence.

What it is: a useful synthesis of well-established data, assembled into a frame that sharpens the question. And the underlying science it draws on is solid. I cross-referenced the key claims against primary literature before including them here.

The Gap Nobody Measures

Here is the core observation, stripped of jargon.

Most biological systems peak in early adulthood. Cardiovascular fitness, raw cognitive processing speed, muscle strength, hormone output, the immune system’s fresh-cell reserves: all of them reach their apex somewhere in the 20s to mid-30s. Then they begin a slow, largely silent decline.

By the time chronic disease appears, the typical woman in her 60s or 70s has often been declining for 30 to 40 years. The disease is the endpoint of a very long trajectory.

But here is the point I want to make, because it is different from how wellness is usually framed.

The goal was never just avoiding disease. Everybody wants to avoid disease. That is not a particularly interesting goal to organise your health decisions around. The more interesting question is: what is the slope doing?

Between peak function and the first clinical diagnosis sits most of your adult life. That stretch is not neutral ground. It is a continuous drift downward through what the Peakspan authors call a “healthy but declined” state. Labs normal. Doctor unconcerned. Functioning, just not as well as you once did.

Think of it like this. You start your adult life with a full battery. Disease is when the device stops working. But there is a very long middle stretch where the battery reads 70%, 60%, 50%, and you are still getting through the day, still told by every test that you are fine. The device works. It just works less well than it used to.

The question worth asking is not “how do I avoid the battery dying?” The question is: how do I keep the battery close to full for as long as possible, so that the final drop is short, late, and fast rather than long, early, and slow?

That is what changing the slope means. And that is what the SAM system is actually designed to do.

What the Data Actually Shows

Here is what the published literature says, system by system. The Peakspan paper synthesises these trajectories; the individual studies are well-established.

Cardiovascular fitness. VO2max, your maximal aerobic capacity and one of the strongest predictors of lifespan, peaks in the mid-20s and declines with age2. It does not plateau. It falls continuously, faster as you age.

Muscle strength. Peak knee extension torque is reached around age 20-28. For women, statistically significant decline begins at 40 to 50 and accelerates substantially between 60 and 70. Grip strength in women holds longer, plateauing until the mid-50s, but the underlying losses in muscle quality start earlier than the grip test reveals.

Fluid cognition. Processing speed, working memory, visual-spatial reasoning: these peak between age 20 and 243. After that, the decline is gradual but continuous. You are at your fastest and most computationally efficient at an age when most women have not yet figured out what they want to do with their lives.

Hormones. More on this in the next section, because female hormonal decline has a different shape from every other system on this list.

Kidney function. Glomerular filtration rate, the measure of how efficiently your kidneys filter your blood, starts declining in the early 30s and accelerates after 45. No symptoms. The decline is silent.

Immune function. Naive T-cells, the immune system’s fresh recruits that have never encountered a specific pathogen, peak before puberty and are already falling steeply by age 20. Thymic output falls to around 5% of its pre-puberty level by 55. This is part of why older adults respond less robustly to novel infections and new vaccines.

Plot all of this together and you see a cascade of systems beginning their descent in the 20s and 30s, while the clinical events medicine focuses on appear decades later. The gap between the two is most of your adult life.

Why Women Need a Different Map

The paper makes a point that Stacy Sims has been making for years: female physiology requires separate models, not adjusted versions of male ones.

For most systems, men and women follow qualitatively similar trajectories, with differences in timing and rate. But for the endocrine system, the shape of the curve is completely different.

Male testosterone declines gradually, roughly 1% per year, for decades. Female estradiol holds relatively stable through the peak reproductive years, then drops sharply and permanently at the menopausal transition4. The authors note this is a “qualitatively different trajectory,” not just a quantitative shift.

This matters because estrogen was not only a reproductive hormone. It was a systems manager, coordinating insulin sensitivity, muscle protein synthesis, bone turnover, inflammatory regulation, cardiovascular function, and aspects of cognitive processing. When it drops, those systems lose a coordinating signal that influenced a remarkable number of downstream processes.

The menopausal transition is therefore not just a hormone event. It is an inflection point across multiple Peakspan trajectories simultaneously.

What Actually Moves the Slope

Here is the honest version.

Some of these declines are not reversible. You are not going to restore the VO2max of a 25-year-old. Postmenopausal estradiol levels are what they are, and no lifestyle intervention restores them to premenopausal levels.

But the slope is modifiable. And the slope is what determines whether you are functional, strong, sharp, and independent at 75, or not.

A 10% per decade decline in VO2max in a sedentary woman produces a very different outcome at 70 than a 5% per decade decline in a woman who trains consistently. The line ends at the same wall, but it hits it later and from a higher starting point. That is the difference between independence and dependence in your final decade.

Cardiovascular fitness

Zone 2 cardio builds mitochondrial density and aerobic base. HIIT boosts VO2max directly. Two 10-minute sessions per week and 150 minutes of moderate cardio is 1.7% of your week.

Muscle strength and bone density

Progressive heavy resistance training is the most powerful tool for slowing musculoskeletal decline. The LIFTMOR trial5 showed that twice-weekly heavy lifting with impact loading improved bone mineral density in postmenopausal women with osteopenia. Not maintained it. Improved it.

Bone density via impact

Ten maximum vertical jumps, three times per week, significantly improved hip bone mineral density over six months6. Less than two minutes of actual jumping per week.

Fluid cognition

Aerobic exercise increases BDNF, the brain’s growth and repair signal. Sleep is when the glymphatic system flushes metabolic waste. Glucose stability reduces neuroinflammation. None of these reverse the underlying decline trajectory, but all of them slow it.

The endocrine system

This is where I want to be precise, because the answer is neither “nothing works” nor “exercise fixes everything.”

You cannot reverse the menopausal estrogen drop with lifestyle. That is true.

But Sims’ work in Next Level7 makes a specific, evidence-grounded argument: brief, intense exercise provides a metabolic and hormonal stimulus that partially substitutes for what declining hormones no longer deliver. HIIT increases human growth hormone and testosterone, decreases estrone (the less favourable form of estrogen produced by fat tissue), and counteracts cortisol when done at two sessions per week. Heavy strength training maintains the anabolic signalling that estradiol used to support.

The mechanism is not restoration. It is substitution. You are not replacing estrogen. You are finding other routes to some of the same downstream effects: muscle maintenance, metabolic function, bone protection. The routes are less efficient without the hormonal environment of your 30s. That is precisely why the dose matters more after 40, not less.

Think of it like this. Estrogen was the main power grid feeding those systems. It has gone offline. HIIT and heavy lifting are the backup generator you have plugged in. Not as seamless. Not as comprehensive. But the lights stay on.

The One Piece of Good News

Not every system follows the same downward slope.

Fluid cognition declines early. But crystallized intelligence, your accumulated knowledge, judgment, vocabulary, verbal reasoning, and pattern recognition built from decades of experience, peaks between ages 45 and 54. It remains relatively stable until around 80.

This is not a consolation prize. It is a distinct cognitive asset. The kind of thinking that requires experience rather than raw speed, that involves integrating complex information, navigating ambiguity, and knowing which questions to ask before rushing to an answer: that is where older expertise genuinely outperforms younger speed.

You are losing processing speed. You are gaining judgment. The goal is to protect both as long as possible.

The SAM Angle

Here is what Peakspan actually changes, if you let it.

Most healthcare advice is designed for the sick: manage your cholesterol, control your blood pressure, reduce disease risk. Most longevity content is designed for the worried-but-healthy: biohacking protocols, expensive tests, targeting the last 1% of variance.

SAM is designed for the gap. The 20 to 30 years between when biological decline begins and when clinical disease appears. That gap is not neutral ground. It is where the slope is set. It is where the trajectory becomes destiny.

The Peakspan framework does not change what SAM recommends. It sharpens why it matters, and what you are actually aiming for.

Sleep is not just about feeling rested. It is about slowing the cognitive and metabolic slope while you are still near the top of it. Heavy lifting is not about looking strong. It is about staying close to peak musculoskeletal function for as long as possible. Glucose stability is not just about avoiding diabetes eventually. It is about protecting systems that are already declining from the additional damage that chronic spikes layer on top.

The goal was never zero disease at age 90. The goal is a long plateau close to your best, followed by a short, late decline. Strong, sharp, and functional through most of your life, and a fast ending rather than a long one.

Changing the slope is how you get there.

A Note on the Research

The Peakspan concept comes from Zhavoronkov, Ying, and Wilczok (2026), published in Aging and Disease. As I flagged earlier, the lead author has commercial interests in the tools the paper proposes. The framework is speculative and the 90% threshold is provisional. What I have used from the paper is its synthesis of existing peer-reviewed data on functional decline trajectories, each cross-referenced independently. The individual references are solid. The unified frame is suggestive, not proven.

Your Turn

What function do you notice has shifted in the last five years, even though nothing is technically wrong?

Comment below. I read every one!

Thank you

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

If you’re new here, hi!

Swiss Army Mum is a simple, science-based wellness system for busy women. Four pillars. No overwhelm.

Not every tool. Just the right ones.

Over the last few weeks, we covered the full exercise pillar: strength training, cardio done smart and balance, mobility and plyometrics.The science is solid. The protocols are clear. But I promised you a behind-the-scenes post. What does this home workout setup actually look like in a real week, with a real life?

This is that post.

No ideal setup. No gym contract. No perfect gear.

Just what I actually use, and the system that makes it effortless to start.

I Don’t Go to the Gym

I used to. In my 20s, a gym membership made sense. I had more time, fewer competing priorities, and no strong opinion about commuting for a workout.

I don’t anymore.

Adding a gym trip to my day now means commute, changing rooms, equipment queues, coming back. That is not a motivation problem. It is a friction problem. And friction is the enemy of consistency, which is the only thing that matters over decades.

So I removed it.

Now it looks like this: I finish work, I pull out the rebounder, I am moving within ten minutes. That is it.

If the gym works for you, keep it. But if you are struggling to show up consistently, do not ask “what is optimal?”

Ask: “what makes this easy to start?”

You Don’t Need Fancy Clothes Either

Before we get to the gear: I do not have cute gym outfits. I wear my trusty old leggings and oversized t-shirts, and yes, sometimes a second sports bra on top of my regular bra when I rebound, because gravity.

Reality over aesthetics. Always.

The Gear: My Complete Home Workout Setup

This is everything I use for a complete workout week. Five items. No machines. No complicated assembly. Each one earns its floor space.

The Rebounder

This is my most-used piece of equipment. Not by a small margin. By a lot.

My first mini trampoline was a cheaper model, also thrifted. I had no idea whether I would actually use it. But I found myself getting on it regularly, almost without thinking, which is the clearest possible signal that something is working. Once I knew rebounding was genuinely part of my routine, it felt worth investing in a better model. I found a Bellicon secondhand, and the difference is real: the bungee cord system is noticeably softer underfoot, which matters when you are using it almost every day.

The reason a rebounder earns so much floor space is that it covers three exercise categories with one tool. It is HIIT when you go hard. It is plyometrics when you focus on jump quality and impact. It is balance training because the elastic surface activates the proprioceptive system (your body’s position sensors in muscles, tendons, and joints) far more intensely than standing on flat ground. That is the same neuromuscular system we broke down in the balance and mobility post, the one that keeps you upright when you stumble, and it gets a serious workout every time you step on an unstable surface.

There is also something harder to quantify. It is genuinely fun. After years of forcing myself through workouts I resented, that matters more than I expected.

The Weights

Two adjustable dumbbell sets. Both thrifted.

The first goes up to 6.25 kg (14 lb).

The second, which I added once the first felt comfortable, goes up to 11.3 kg (25 lb).

In practice, the heavier set handles lower body and back work: squats, deadlifts, rows. These are the large muscle groups, and they need more load to generate a real training signal. For upper body, I stay around 6 to 7 kg (13 to 15 lb) for now. That is the range where I still have to genuinely work through the last few reps, which is the whole point.

Adjustable dumbbells are worth knowing about because they give you an enormous range of loads in a very small footprint. Rather than a rack of fixed weights taking up half a room, you have two compact sets that cover everything from light accessory work to heavy compound movements. The trade-off is that changing the weight mid-workout takes a few extra seconds. I have never found this to be a real problem.

A word on progressive overload in practice: I did not buy both sets at once. And they were both thrifted. I started with the lighter pair, used it until the exercises started feeling manageable rather than challenging, and then added the heavier option. That is exactly how it is supposed to work. You do not need the full range on day one. You earn your way up.

One thing I notice on every new cycle through my program: I have gone heavier, I have slowed the movements down, and I focus more carefully on the muscle I am actually working rather than just completing the rep. That is what strength progress looks like in practice. Not dramatic. Measurable.

The Walking Pad

Also thrifted, also used constantly. This is probably the most invisible part of my routine, but not the least impactful.

On days I work from home, I can easily walk an hour without noticing. Every evening after dinner, I step back on for 10 to 30 minutes, depending on where my step count sits. No planning, no outfit change, no transition. Just walking.

This is how I hit my daily movement baseline without it feeling like exercise. My morning dog walk covers part of it. The pad covers the rest, particularly on days when I need to commute and the morning walk is shorter.

The Yoga Mat and the Foam Roller

The one item I bought new is the yoga mat. I use it for everything: strength work, mobility, yoga, stretching, foam rolling. It has not left the floor.

My foam roller is old. Still perfectly functional. Foam rollers do not wear out the way people think. This is the kind of tool that does not feel exciting but keeps everything else working. 10 minutes twice a week is enough to make a real difference to how you move and recover.

The YouTube System That Runs Everything

I do not plan individual workouts. Or more accurately, I plan them once, at the start of the year, and then that decision does not exist anymore.

This is a Flow pillar principle applied directly to exercise: remove the decision entirely. When it is time to train, I do not search, scroll, or wonder what to do. I press play.

Here is how each category works.

Strength: Lift with Cee

This is the backbone of my lifting. There are tons of YouTube fitness channels. I’ve tried quite a few and I kept coming back to Cee. She does real lifting, does not talk incessantly (which is something I do not appreciate in fitness videos), and has a clear objective and structure to her videos. We’re here for strength and strength is what we get.

If you are new to lifting weights, watch her introduction video first. She explains her method clearly, and it saves you the confusion of trying to figure it out where to start.

I use two of her full-body combo set playlists, 21 videos each.

• Playlist A

• Playlist B

I alternate them week by week: week 1 from playlist A, week 1 from playlist B, week 2 from playlist A, and so on. Each workout repeats three times in a week before I move to the next. 42 videos total. With holidays factored in, this covers almost a full year before cycling back to the beginning.

Both playlists have identical total volume, 24 working sets per session, just structured differently. Playlist A uses a 40 seconds on, 20 seconds rest timing. Playlist B is rep-based. I ignore both systems. I choose a weight I can lift for 6 to 8 clean reps, and I use whatever time remains to recover and reset.

The content is what matters. The timer is just scaffolding.

These playlist have been real game changers to achieve consistency.

Rebounding: Earth & Owl

Earth and Owl is my primary rebounding resource. Nikki’s pace, her attention to tempo, and the overall feel of her sessions suit how I like to move. It is not high-adrenaline or performative. It is focused and deliberate, which is exactly what I want.

For HIIT, I rotate through her menopause playlist, particularly the 30/90 versions (30 seconds on, 90 seconds recovery). On lower-energy days, I choose one of her lighter flow or gentle sessions instead. The range she covers means I always have something that fits the day I am actually having, not the ideal day I planned for.

A few other channels worth knowing:

Jump and Jacked has a more upbeat, high-energy feel. Great if you respond well to that kind of motivation and want something with more momentum behind it.

SanFran Fitness is more grounded and athletic in tone. I keep their lymphatic drainage video on my quick-access list for days when I want to move but nothing intense sounds appealing.

Michelle Briehler is high-intensity and very focused. Her sessions are short but genuinely demanding. On days when I have the energy and want something punchy, 10 minutes with her is plenty.

Mobility & Yoga

Charlie Follows is my go-to for stretching and yoga. Her 10 to 15-minute videos sit in a useful middle ground: long enough to actually open things up, short enough to slot into a day without a second thought.

Depending on where I am in my cycle or how the body feels, I pick something gentler or something more dynamic. I will come back to how I adapt training across my cycle when we get to the Glow pillar.

For foam rolling, I rotate between two videos I have bookmarked: the 15-minute routine from Well and Good, and Tom Peto’s 10-minute version. Both work well. Which one I use depends entirely on available time.

On days when I have skipped a strength session, a longer mobility flow from Strength and Flow Fitness is what I reach for. 15 minutes of deliberate movement, and I never regret it.

The Calendar System (This Is What Actually Makes It Work)

The gear and the videos are tools. The calendar is the system that ties them together.

Here is exactly how I structure it.

42 weekly events, set up once a year. For strength training, I create a recurring weekly event for each workout in the Lift with Cee rotation. Each event has the title of that week’s session and the direct link to the video embedded in the notes. Set up 42 of these at the start of the year and you are done. No searching, no deliberating, no friction. When the event appears, I open it, click the link, and train.

A Sunday “YouTube Resources” block. Every Sunday, I have a recurring all-day event that holds all my other go-to links: rebounder sessions for different energy levels, yoga and mobility videos, foam rolling routines. It is not a task. It is a reference library. On any given day, I open one event and choose from what is already there.

Color-coded exercise blocks. All my exercise commitments, strength, cardio, mobility, use the same calendar color, distinct from my work and personal commitments. This is a small thing that makes a real difference. At a glance, I can see how my movement is distributed across the week without reading a single event title. If a week looks light on that color, I know before it happens.

The result is a week that runs on autopilot. The decisions were made in once a year. Everything else is just following the plan.

Please take a minute to appreciate the fact that most of the calendar is free! You actually need less than 3% of your time to hit the recommended amount of exercise.

Links for your resource block (Copy This Into Your Calendar)

Build your Sunday block today. It takes about 20 minutes to set up and removes a decision you would otherwise make dozens of times a year. Remember my strength videos are in my calendar but as weekly events, since I change each week.

Everyone’s preferences will differ, so adjust for yours, but this is mine:

Rebounder

HIIT

• 30/90 - Earth & Owl

• 30/90 - Earth & Owl (v2)

• Tabata - Earth & Owl

High energy cardio

• 10 min - Michelle Briehler

Lymphatic drainage

• Lymphatic care - Earth & Owl

• Lymphatic care - SanFran Fitness

Plyometrics

• Bone health - Earth & Owl

Yoga

• Charlie Follows - 15 min sessions

Foam rolling

• Well and Good - 15 min

• Tom Peto - 10 min

Primal mobility flow

• Strength and Flow Fitness - 15 min

What This Looks Like in Practice

Some weeks are clean. I lift three times, rebound four times, do a yoga session on Sunday, and hit my step count without much effort.

Other weeks are not. There is a deadline, or someone is sick, or I just have no energy for anything demanding. Those weeks, I walk. I do 10 minutes on the rebounder. I stretch on the mat. I do something small.

Because everything is simple, at home, and pre-decided, I show up consistently even when motivation is low. That is the whole point. Systems do not require you to feel like it. They just require you to start.

The Home Workout Setup You Actually Need

You do not need a gym. You do not need expensive equipment. You do not need a different routine every week.

You need low friction, a few versatile tools, and a system you can repeat without thinking.

Rebounder. Weights. Walking pad. Mat. Calendar.

That is it. That is the whole thing.

Your Turn

What is your current workout setup? Home, gym, both?

Is friction the thing stopping you, or something else entirely?

And if you are already rebounding: which channels or videos are you using? I would love to expand the list.

Drop a comment below. I read every one.

Thank you

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

If you’re new here, hi!

Swiss Army Mum is a simple, science-based wellness system for busy women. Four pillars. No overwhelm.

Not every tool. Just the right ones.

Over the last few weeks, I’ve been breaking down the exercise pillar: the overview blueprint, then deep dives into strength training, cardio, as well as balance, mobility and plyometrics. The science is solid. But one question kept surfacing: why does standard exercise advice so often fail women in perimenopause and beyond? This week, I’m pulling back the curtain on the book that answers that question most honestly: Stacy Sims’ Next Level.

This isn’t a summary. It’s my take on what hit me hardest, what felt off, and how I distilled 300 pages into the SAM exercise framework so you get the protocols without needing to stress about remembering everything.

Welcome to the SAM Book Club

Here’s how this works: I don’t write summaries. I share critical reads from a busy woman’s perspective (and a mum!) - what surprised me, what I’d challenge, and how it fits into the SAM system.

Why books, not just studies?

Books - especially from trained specialists like Sims - are pre-curated syntheses of hundreds of scientific publications. She has already read the literature and kept the most relevant findings (though probably with a bias toward her own research). I use primary studies sparingly, either when I want to go deeper on a specific mechanism or to fact-check.

SAM is the synthesis layer

I make thorough mindmaps of the books I read (or listen to), then pull what’s most impactful and actionable into the overall SAM blueprint.

You get the protocols without needing to take notes or stress about implementation. Read the books for enjoyment, context, and conviction - not as homework.

Time investment?

Next Level is around 300 pages, roughly 8 to 9 hours of reading or listening. As always, audiobooks are the best thing since sliced bread for nonfiction. Stack it onto a long walk or your commute and it becomes entirely manageable. That’s how I got through it.

In a nutshell

Why I Recommend Next Level for Women Over 40

Stacy Sims is an exercise physiologist and nutrition scientist who has spent her career studying how female physiology responds to training and nutrition. Her central thesis is one of the most important ideas in women’s health right now: women are not small men.

This is not rhetoric. It reflects a long-standing structural bias in biomedical research.

In 1977, the U.S. Food and Drug Administration issued guidance recommending the exclusion of women of childbearing potential from early-phase clinical trials. The policy emerged after the thalidomide and diethylstilbestrol (DES) tragedies and was intended to protect potential pregnancies from drug exposure. The practical result, however, was that for more than a decade early clinical research was conducted largely in men.

Although the policy was reversed in 1993 with the NIH Revitalization Act1, which required the inclusion of women in NIH-funded research, the legacy persisted. Large analyses of clinical trials continue to show that women are somewhat underrepresented. A review of clinical trials published between 2000 and 2020 found that sex differences in clinical trials varied by clinical trial disease category, with male and female participants underrepresented in different medical fields. Although sex equity has progressed, these findings suggest that sex bias in clinical trials persists within medical fields, with negative consequences for the health of all individuals.2 Early-phase trials still tend to include fewer women, often around 30% of participants, reflecting probably ongoing caution around pregnancy risk and reproductive safety.3

The picture in exercise science is even more skewed. A large review of sport and exercise medicine publications between 2014 and 2020 (covering millions of participants) found that roughly two-thirds of participants were men, while women accounted for only about one-third. More strikingly, just 6% of studies investigated women exclusively, whereas male-only studies were far more common.4

Even when women are included, they are often treated as a secondary group rather than the primary subject of investigation. Many studies recruit young adults (often university students or athletes) and do not control for menstrual cycle phase, hormonal contraception, or menopause status. As a result, post-menopausal women, whose physiology differs substantially from both younger women and men, remain relatively understudied in exercise research, despite being one of the populations most likely to benefit from tailored exercise guidance.

The imbalance appears even earlier in the scientific pipeline. For decades, preclinical biomedical research relied heavily on male animals and male cells. A highly cited study found that single-sex studies of male animals outnumbering those of females 5.5 to 1, largely because researchers assumed female hormonal cycles would introduce unwanted variability.5

The irony is that this assumption turned out to be wrong. When researchers finally tested it directly, they found that female animals are not more variable than males.6 In fact, male physiology fluctuates substantially due to pulsatile testosterone secretion and environmental factors. The supposed “female variability problem” was largely a myth, yet it shaped decades of experimental design.

This bias has had real consequences. Several experimental stroke drugs that showed strong neuroprotective effects in male rodents ultimately failed in human trials. Later analyses suggested the drugs interacted differently with estrogen signaling pathways, meaning the preclinical evidence had been biased from the start. When female animals were included, the protective effect often disappeared.

Taken together, these patterns illustrate a broader problem: biomedical science has historically treated the male body as the default template. The result is a research literature that often tells us how men respond to drugs, exercise, and nutrition and then assumes women will respond the same way.

Stacy Sims’ argument challenges that assumption directly. If we want evidence-based guidance for women, we need research that actually studies female physiology.

It’s also worth knowing how Next Level sits relative to Sims’ earlier book, ROAR, which I started and stopped halfway through. ROAR is about optimising athletic performance around the menstrual cycle for younger women who are actively competing. Excellent science, wrong audience for me. I was never an athlete at 20. I’m not one at 40. I don’t need race-day protocols. I need to understand what’s actually happening in my body and what to do about it.

Next Level is for that woman. Normal, active, not trying to podium, just trying to age well.

What makes it worth reading

The female-specific framing, sustained throughout. Not a chapter on “women’s considerations” tucked in at the back. The whole book is built around female physiology, which is still, in 2025, rarer than it should be.

The hormonal context for everything. Once Sims explains what estrogen was doing behind the scenes, every protocol recommendation clicks into place. You stop following instructions and start understanding the reasoning.

The honest acknowledgment of research gaps. She doesn’t pretend the literature on women over 40 is complete. She’s contributing to building it.

The SAM angle

Read this for the “why.” Get the “how” from the blueprint.

You don’t need to remember every detail from 300 pages. I’ve already pulled the 80/20 into the exercise framework - so you can read this book for conviction and context without the pressure of implementing it all yourself.

The Busy Woman’s Perspective

Time investment: 300 pages, around 8 to 9 hours. Manageable, especially on audio.

Tone: Sims is direct and no-nonsense, which I appreciated. No hand-holding, no wellness-speak. She talks to you like an adult who can handle science and deserves a straight answer.

Emotional weight: Lighter than Why We Sleep. Sims is motivating rather than alarming. The message is: your biology has changed, here is what to do about it. That feels empowering rather than anxiety-inducing.

One honest caveat: both Next Level and ROAR can tip into overwhelm. Specific meal composition before training. Exact salt and glucose grams per litre for your hydration mix. Precise post-workout timing windows that close after 30 minutes.

If you’re in full biohacking mode and love fine-tuning every variable, this is heaven.

If you’re a busy woman trying to move consistently and not overthink it, some of this detail is noise.

A note on supplements and adaptogens: the relevant sections are genuinely interesting, and I’ll come back to them properly in the Glow pillar. For now, I’m not personally using any of them, so I’ll leave that thread for later.

Habit stack reminder: don’t let the page count intimidate you. I got through it on long dog walks and weekend mornings. Audiobook, headphones, done.

Bottom line: worth reading for conviction and context - but don’t stress about implementing every protocol. That’s what SAM is for.

What Hit Me Hardest: Key Takeaways

Estrogen Was Doing Far More Than You Knew

Most of us grew up thinking of estrogen as the hormone that runs the reproductive system and then causes trouble at menopause. That framing undersells it by an enormous margin.

Estrogen - your primary female sex hormone - is also metabolically active, anti-inflammatory, and neuroprotective. It regulates insulin sensitivity, supports muscle protein synthesis (the process of building and repairing muscle tissue), maintains bone density, modulates inflammation, and plays a role in how your brain consolidates memory and manages mood. It was, quietly, doing a lot of the administrative work your body relies on.

Think of estrogen as a systems manager, running in the background, keeping multiple departments coordinated. When it declines during perimenopause, those departments don’t just slow down. Some of them start running without their usual oversight.

This is why the physiology of perimenopause matters so much to understand. It is not a cosmetic inconvenience. It is a full organisational restructure.

Responding to it with the same tools you used in your 20s and 30s - eating less, doing more cardio, pushing through fatigue - is a bit like telling an understaffed factory to increase production. The inputs haven’t changed. The infrastructure has. The strategy needs to change with it.

What stuck with me: once I understood what estrogen was actually doing, the specific protocol shifts Sims recommends stopped feeling arbitrary. They’re not preferences. They’re logical responses to a real biological shift. That distinction matters for motivation.

The Three Hormones Behind the Shift

Estrogen gets most of the attention when perimenopause comes up, but the full picture involves three hormones working together - and understanding all three makes the “why” behind every training and nutrition adjustment much clearer.

Estrogen exists in three forms. Estradiol (E2), produced by the ovaries, is the dominant sex hormone during your reproductive years and the one you feel the loss of most sharply at perimenopause. Estrone (E1), produced by fat tissue, becomes the main circulating form after menopause. Estriol (E3) is produced during pregnancy. When people talk about declining estrogen, they mostly mean the drop in E2.

And E2 was doing an extraordinary amount of work. It promotes muscle growth and strength, supports mitochondrial function (the energy-producing machinery inside your cells), regulates inflammation, manages blood sugar, controls appetite, influences mood, regulates body temperature and blood pressure, and builds bone. If this list feels surprisingly long, that’s the point. Estrogen was not just a reproductive hormone. It was a systems hormone, with a hand in almost every physiological process that keeps you feeling well.

Progesterone is less discussed but equally important. It increases connective tissue stability, protects the brain, provides some pain relief, builds bone alongside estrogen, and supports heart rate variability - your cardiovascular system’s ability to adapt to stress. It also plays a role in cooling inflammation and regulating immune response. One function worth noting specifically: progesterone actively breaks down muscle tissue (catabolism). This is counterbalanced during reproductive years by estrogen’s anabolic (muscle creation) effects. When both decline together, that balance shifts.

Testosterone is the supporting actor. Women produce far less of it than men, but it matters. It works in concert with estrogen and progesterone to maintain healthy bones and muscles, supports libido, and helps protect the brain. Unlike estrogen and progesterone, your ovaries and adrenal glands continue producing testosterone even as the other hormones decline - but that doesn’t fully compensate. As Sims explains, the loss of estrogen and progesterone makes your body less sensitive to the muscle-building stimulus of exercise and protein. Muscle tissue begins to be threaded with fat tissue during this transition, which is why your muscle tone, power, and recovery can change even when you haven’t changed anything about how you train. It isn’t a failure of effort. It’s a shift in the hormonal environment that effort alone can’t override.

This is the biological backdrop to everything that follows. These three hormones were maintaining more than most of us realised - and their decline is why the strategies that worked before need to be updated, not abandoned.

Long, Steady Cardio Is the Wrong Tool for This Stage

This was the most counterintuitive shift for me, and Sims earns it with clear mechanistic reasoning.

The default response to weight gain and metabolic changes at perimenopause is usually more cardio. Run more. Cycle more. Burn more. It feels logical. The problem is that chronic steady-state cardio keeps cortisol - your primary stress and mobilisation hormone - elevated. And cortisol is already harder to regulate when estrogen is declining.

In short bursts, cortisol is essential: it releases stored energy to fuel sustained effort. Chronically elevated, it becomes counterproductive. It accelerates muscle breakdown (catabolism, or the process of breaking tissues down for fuel), shifts fat storage toward the abdomen, and impairs recovery. You’re adding more of a stress signal to a system that’s already struggling to manage it.

Sims’ prescription is almost the inverse of conventional wisdom: brief, intense effort followed by complete recovery. Short, hard intervals that provoke a strong adaptation signal, then rest. The intensity is the stimulus. The recovery is where the adaptation actually happens.

What stuck with me: I covered the cardio science in the exercise series, but this was the hormonal context that made it click. It’s not that cardio is bad. It’s that the dose, the intensity, and the recovery ratio matter enormously at this stage - and most of us have been getting the ratio wrong for years.

Your Muscles Are Less Forgiving Now, So You Have to Be More Deliberate

This one requires a concept: anabolic resistance.

Anabolic refers to the biological processes that build and repair tissue. Anabolic resistance means your muscles have become less sensitive to the signals that trigger growth and repair. The same protein intake that maintained muscle in your 30s may no longer be sufficient. The same training stimulus that built strength before may now require a stronger signal to produce a comparable result.

Think of it as a dimmer switch that has been turned down. The signal is still there, but the response is quieter. You need to turn the volume up.

Sims argues two things follow from this. First, protein targets for women over 40 need to increase - most women are eating well below what current evidence suggests is needed for muscle maintenance at this stage. Second, training needs to include genuinely heavy loads, because light resistance work no longer provides a strong enough signal for muscle to respond and rebuild.

This isn’t about extremes. It’s about recognising that what worked at 30 is no longer the right calibration - and that adjusting is not defeat. It’s just good biology.

What stuck with me: I had already covered the loading science in the strength training post - lifting heavy, progressive overload, compound movements. But this is the biological explanation for why it matters more after 40, not just for aesthetics or performance, but for preserving the metabolic machinery that keeps you well for decades.

What Sims Gets Right (And What Felt Off)

What She Nails

The female-specific lens, applied consistently across exercise, nutrition, and recovery. This is the book’s greatest strength and what makes it genuinely different from almost everything else in the fitness space.

Her sections on how visceral fat distribution shifts in peri and post-menopause, and the hormonal mechanisms behind it, are clarifying in a way I hadn’t encountered elsewhere. The HIIT protocols for menopausal women are well-evidenced and practical. And the honest acknowledgment that research on women over 40 is historically sparse is refreshing - she’s not just synthesising existing literature. She’s contributing to building it.

What Felt Off

The hydration chapter. Sims gets into exact grams of sodium per litre for training drinks, with formulas adjusted for different conditions and intensity levels. For a competitive athlete preparing for a long race, that precision matters. For a woman doing three exercise sessions a week and living a normal life, water is genuinely fine. We evolved to hydrate with it (while eating foods which delivered the electrolytes along with it).

The post-workout eating window also received more emphasis than it deserves for a general audience. Sims frames it as a narrow, time-sensitive opportunity that closes after 30 minutes. For performance athletes, the window matters. For everyday health? The principle is what counts: eat protein after training and in general. I exercise, and then I eat. I don’t track the exact time frame. Most women reading this don’t need to either. It adds friction.

Why Read It Anyway

Because even where Sims occasionally tips into over-specification, the core framework is rock-solid: female physiology at perimenopause and beyond requires a different approach, and the approach she lays out is evidence-based, practical, and designed for the right person.

The female-specific framing also makes the science stick in a way that generic exercise advice never does. You stop reading about “people” and start reading about yourself.

If you want conviction and context for why the SAM approach is structured the way it is, this book delivers.

How This Became the SAM Exercise Blueprint

After reading Next Level, I pulled the 80/20 - the interventions that actually move the needle - and built them into the exercise framework.

What made the cut:

• The biological case for brief, intense work over chronic steady-state cardio, given the cortisol-estrogen interaction.

• Heavy compound lifts as non-negotiable for bone density, metabolic health, and anabolic signaling.

• The importance of plyometrics, stability and mobility.

• Upward recalibration of protein targets for women over 40 Recovery as a training variable, not an optional extra.

• The “women are not small men” framing as the lens for all exercise and nutrition decisions at this stage

What I left out:

• The performance athlete protocols and race-day nutrition strategies.

• The precise nutrient timing windows (the 30-minute post-workout rule).

• The electrolyte formulas for training drinks.

• The supplement and adaptogen protocols (coming in the Glow pillar)

The result: you get the actionable version, calibrated for a normal, active woman who wants to age well - without needing to remember 300 pages.

If you want to go deeper on the science, the context, and the conviction behind the framework, here’s the book.

Your Turn

Have you read Next Level or ROAR? Did the “women are not small men” framing land for you the way it did for me - or did parts of it feel like too much to act on? Drop a comment below. I read every one.

Next week: the exercise setup that actually works for a busy woman - my thrifted equipment, the free resources I use every week, and proof that you don't need a gym membership or expensive gear to hit your targets.

See you there.

Subscribe so you don’t miss it.

Subscribe now

Thank you!

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space and build sustainable health without the overwhelm.

Share Swiss Army Mum

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

This is Part 3 of a 3-part deep-dive series on exercise.

We have covered the Exercise Blueprint: the overview of all six movement types and the 80/20 minimum (steps + strength 2x/week).

Now we’re zooming in. This mini-series breaks down the three essential categories of exercise:

• Part 1: Strength Training - How muscle is built, the 6-step bracing protocol, lifting heavy

• Part 2: Cardio - Zone 2 mechanism, HIIT hormonal advantages

• Part 3 (this post): Balance, Mobility & Plyometrics - Neuromuscular control, falls prevention, improving bone density

This post sits in the Exercise area of the Body Pillar, specifically in the Balance, Mobility and Plyometrics component. This is the part of Exercise that gets cut first when time is short, which is exactly why it earns its own post. Strength and Cardio tend to absorb the available training time; Balance and Mobility do their most important work quietly in the background, reducing injury risk, maintaining functional range, and keeping the other two components sustainable for decades. Skip it long enough, and the other two suffer for it.

This post is your complete guide to balance and mobility training for women over 35: preventing falls, building bone density, and staying functional for decades.

I Ignored Mobility Until I Couldn’t Squat

I thought mobility work was optional. Extra. Something you do if you have time after the “real” workout.

I was wrong.

A few years ago, I couldn’t squat to depth without my heels lifting off the ground. My ankles were so stiff from years of sitting that I couldn’t get into a proper squat position. I compensated by rounding my lower back, which is exactly how you get injured.

My physical therapist gave me one exercise: sit in a deep squat for 2 minutes every day. That’s it.

Within 3 weeks, my ankle mobility improved enough to squat properly. Within 6 weeks, I could deadlift without my back rounding.

Then she added balance work and plyometrics. Single-leg stands on unstable surfaces. Jumping on a rebounder (mini trampoline). At first, I felt ridiculous. But after a few weeks, I noticed something: my proprioception (my body’s awareness of where I was in space) improved dramatically. I could catch myself when I stumbled. My lifting form got better because my body knew how to stabilize automatically.

And the bone density benefits? Research shows that impact loading significantly improves hip bone density. Combined with heavy lifting, it’s one of the best protections against osteoporosis after menopause.

That’s when I learned: mobility, balance, and plyometrics aren’t extra. Here’s what they do:

• Prevents falls. Falls are the leading cause of injury and death in older adults. Not the fall itself—the complications. Hip fracture → hospital → infection → decline. One fall can cascade into loss of independence.

• Keeps you functional. Bending down to pick something up. Reaching overhead. Twisting to look behind you. Getting up from the floor without using your hands. These movements require mobility and stability.

• Protects your joints. Tight hips, stiff shoulders, weak ankles: these compensations lead to injury. Mobility and stability work keeps your joints healthy so you can keep lifting, running, and moving for decades.

• Builds bone density. Jumping (plyometrics) creates impact forces that signal bones to remodel and strengthen: critical for preventing osteoporosis after menopause.

A Cochrane systematic review1 found that exercise reduces fall rate by ~23% overall in older adults, with the strongest evidence for balance/functional training and multicomponent programs.

This isn’t extra. You can’t lift heavy safely (Part 1: Strength Training) without it. You can’t do HIIT effectively (Part 2: Cardio) without it. You can’t stay functional without it.

This post breaks down three essential activities:

1. Stability & Balance Training - Neuromuscular control, proprioception, core strength

2. Plyometric Training - Impact loading for bone density

3. Mobility Training - Range of motion, fascia health, flexibility

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

Why It Matters

Falls Are Not Inevitable

Most people think falls are just part of aging. They’re not.

Falls happen when your neuromuscular control system (the integration of your brain, sensory systems, and muscles) fails to make the precise adjustments needed to maintain balance.

The evidence is clear: exercise reduces fall rate significantly. This matters most from age 60 onward, but prevention starts earlier. If you’re 35-55, this work is “prehabilitation”: building capacity before you need it.

Here’s what I think about: my grandmother fell at 78. Hip fracture. Surgery. Hospital for 3 weeks. She never fully recovered. Within 6 months, she lost her independence: needed help dressing, couldn’t drive, moved into assisted living.

One fall. That’s all it took.

Mobility Declines Without Use

“Use it or lose it” applies to joints, fascia, and range of motion.

Sitting 8+ hours per day creates tight hip flexors, stiff shoulders, and limited ankle mobility. Over time, restricted mobility leads to compensatory movement patterns (lifting with a rounded back because you can’t hinge properly), joint pain (knee pain from tight hips), and injury (shoulder impingement from limited thoracic mobility).

Hormonal changes matter: During perimenopause and menopause, declining estrogen affects connective tissue integrity. Tendons, ligaments, and fascia become less pliable. Without mobility work, stiffness accelerates.

Bone Density Requires Impact Loading

After menopause, women lose bone density rapidly. Estrogen decline accelerates bone loss: women can lose up to 20% of bone density in the 5-7 years following menopause.

Heavy strength training helps (remember the LIFTMOR trial from Part 1: +2.9% lumbar spine bone mineral density with twice-weekly heavy lifting plus impact loading). But the impact loading component is critical.

Jumping creates multidirectional stress on bones: your skeleton adapts by laying down new bone tissue2. Research shows that just 10 maximum vertical jumps, 3 times per week, significantly increases hip bone mineral density in 6 months3. That’s 30 jumps per week total. Less than 2 minutes of work.

Weight-bearing cardio (walking, jogging) helps, but high-impact plyometrics (jumping) produces superior bone-building stimulus. The key: ground reaction forces from jumping are 2-4 times higher than walking or jogging.

Without impact loading, your bones don’t get the signal to strengthen. Plyometrics isn’t optional after menopause: it’s essential.

Core Strength Is Not Just “Abs”

Most people think core strength means visible abs. It doesn’t.

Core = 360° torso stability. It’s everything except your limbs: abdominals (front), obliques (sides), spinal erectors (back), pelvic floor (bottom), diaphragm (top).

Remember the 6-step bracing protocol from Part 1 (Strength Training)? That’s 360° core stability in action: not just abs, but your entire torso working as a pressurized cylinder.

A strong core protects your spine during lifting, prevents urinary incontinence (common after menopause), allows safe force transfer when throwing or lifting overhead, and maintains posture. Think of it as the foundation that holds everything together.

A weak core leads to back pain, poor posture (rounded shoulders, anterior pelvic tilt), injury risk from compensations during lifting, and urinary incontinence.

Core strength is foundational for everything else.

How to train for it

Stability & Balance Training

What it is: Your ability to control your body position during movement (stability) and maintain equilibrium through proprioception and postural control (balance).

Why it matters: Your neuromuscular control system integrates three sensory inputs: (vision, vestibular (inner ear), and proprioception (body position sensors in muscles, tendons, joints)) to keep you upright. With aging, proprioceptive acuity declines (fewer mechanoreceptors, less sensitive, slower signals), increasing fall risk. Balance training recalibrates these sensors and strengthens brain-muscle communication.

Think of it like a car’s stability control system: sensors detect when you’re starting to skid (proprioception, vision, inner ear), the computer processes the data (your brain), and corrective actions happen automatically before you even realize you were losing traction (muscle adjustments).

Core Stability Exercises

If you’re doing the strength training protocol from Part 1, you’re already building core stability through:

• 360° Diaphragmatic Breathing - Creates intra-abdominal pressure (IAP), the internal brace that protects your spine. Lie on back, breathe into belly/sides/lower back (not chest), exhale while tightening abdominal wall.

• Planks - Trains anti-extension (resisting lower back arch). Forearms on ground, body in straight line, squeeze glutes, breathe.

• Dead Bugs - Trains anti-extension + coordination. Lie on back, arms up, knees bent 90°, press lower back flat, lower opposite arm and leg.

• Bird Dogs - Trains anti-rotation. Hands and knees, extend opposite arm and leg, keep hips level.

• Pelvic Floor Exercises - Kegels. Contract pelvic floor (imagine stopping urination mid-stream), hold 5-10 seconds.

Balance Exercises

• Single-Leg Stands - Stand on one leg, hold 30 seconds each. Progress to eyes closed, unstable surface (pillow), or adding movement (reach arms overhead).

• Heel-to-Toe Walk - Walk in straight line, placing heel directly in front of toes (like walking tightrope). 10 steps forward, 10 backward.

• Balance Board / Wobble Cushion - Stand on unstable surface for 30-60 seconds. Progress to single leg.

• Tai Chi - Slow, controlled movements with weight shifts. Strong evidence for falls prevention.

• “Toe Yoga” - Lift big toe while keeping other toes down, then reverse. Improves foot strength and ankle stability. 10 reps each.

• Rebounder Work - Jump on mini trampoline with single-leg bounces, heel-to-toe walks on rebounder surface, dynamic balance drills. The unstable surface activates proprioceptors intensely while being joint-friendly. This is my personal favorite and I’ll come back to it later on.

Plyometric Training

What it is: Jumping exercises. Squat jumps, box jumps, jumping jacks, skipping, rebounder jumps.

Why it matters: Jumping creates impact forces that signal bones to remodel and strengthen, especially important for preventing osteoporosis after menopause. Ground reaction forces from jumping are 2-4 times higher than walking or jogging, creating superior bone-building stimulus.

Research shows that just 10 maximum vertical jumps, 3 times per week, significantly increases hip bone mineral density in 6 months. That’s 30 jumps per week total, less than 2 minutes of actual jumping.

Plyometric Exercises

Low-Impact (Start Here):

• Rebounder jumps - Mini trampoline reduces joint impact while providing bone-building stimulus. My fav!

• Marching in place - Lift knees high, land with impact

• Step-ups with hop - Step up onto box, add small hop at top

Moderate-Impact:

• Jumping jacks

• Skipping

• Side hops

• Squat jumps

High-Impact (Advanced):

• Box jumps (start low, 6-12 inches)

• Jump rope

• Tuck jumps

• Broad jumps

Critical note: If you have joint issues, low bone density (osteoporosis), or haven’t exercised in years, get medical clearance first. The LIFTMOR researchers specifically caution against unsupervised high-impact programs in women with osteoporosis—supervision and proper progression matter.

Start low-impact: Use a rebounder (mini trampoline) for joint-friendly plyometrics. The unstable surface also trains balance and proprioception while you jump.

Mobility Training

What it is: Range of motion in joints + flexibility + fascia health.

Why it matters: Without mobility, daily movements become difficult: reaching overhead, bending down, twisting, getting up from the floor. During perimenopause and menopause, declining estrogen affects connective tissue integrity. Tendons, ligaments, and fascia become less pliable. Without mobility work, stiffness accelerates.

You need two things: Yoga or stretching (for flexibility, range of motion, and mental health) and Foam Rolling (for fascia care and muscle tension release).

Yoga: Mobility + Mental Health

Yoga is great for mobility. It stretches tight areas (hip flexors, hamstrings, chest, shoulders, thoracic spine), improves range of motion, and reduces stress.

How to approach yoga:

• Frequency: 1-2x/week (20-30 min sessions)

• Styles for mobility:

  • Yin yoga: Long holds (3-5 min), deep stretches

  • Vinyasa flow: Dynamic movement, full-body mobility

  • Restorative yoga: Gentle, supportive stretches

Focus areas for women:

• Hip flexors - Couch stretch, lunge stretch

• Hamstrings - Forward fold, strap stretch

• Chest/shoulders - Doorway stretch, wall angels

• Thoracic spine - Cat-cow, thread the needle

Mental health bonus: Yoga reduces cortisol, improves sleep quality, and helps with perimenopausal/menopausal symptoms like mood swings and anxiety. You’re getting mobility and mental health in one session.

Foam Rolling: Fascia Care

What is fascia? Fascia is connective tissue that wraps muscles, organs, and bones. With inactivity, repetitive movements, or stress, fascia gets “stuck”: adhesions form, restricting movement and causing pain.

Foam rolling breaks up adhesions, improves blood flow, and restores mobility.

How to foam roll:

• Pressure: Uncomfortable but not painful (6-7 out of 10)

• Duration: 30-60 seconds per area

• Technique: Slow rolls, pause on tender spots (don’t roll back and forth quickly)

• Frequency: 5-10 minutes, 1-2x/week

Target areas for women:

• Hips (IT band, TFL, glutes) - Roll outer thigh, front of hip, glutes

• Feet (plantar fascia) - Roll with lacrosse ball or frozen water bottle

• Shoulders/upper back (traps, rhomboids) - Roll upper back on foam roller

• Achilles/calves - Roll calves, stretch Achilles

How Much You Need: The 80/20 Approach

Here’s the best part: you can combine stability, balance, and plyometrics in a single tool: the rebounder (mini trampoline).

A 15-minute rebounder session covers:

• Balance work - Single-leg bounces, dynamic balance drills on unstable surface

• Plyometrics - Jumping for bone density (squat jumps, high knees, tuck jumps)

• Core stability - Maintaining stability while jumping activates deep core muscles

You can even use the rebounder to sneak in your HIIT in the same amount of time! Add yoga for mobility and foam rolling for fascia care, and you’re done.

Minimum effective dose:

• Rebounder: 3-4 sessions × 10-15 min = 30-60 min/week

• Yoga: 1 session × 20-30 min = 20-30 min/week

• Foam rolling: 1-2 sessions × 10 min = 10-20 min/week

Total time: 60-110 min/week (1-2 hours = 0.6-0.9% of your week)

Sample Weekly Routine

Here’s how I actually structure my week. This is the minimum effective dose for stability, balance, plyometrics, and mobility:

Monday: Day off

Tuesday: Rebounder session (10 min) - HIIT + Foam rolling (10 min)

Wednesday: Rebounder session (10 min) - Balance and stability work

Thursday: Day off

Friday: Rebounder session (10 min) - HIIT

Sunday: Rebounder session (10 min) - Plyometrics + Yoga (20 min)

Total time per week: 70 min/week

This sample focuses on balance/mobility/plyometrics only. In the BTS post, I'll show you how I integrate this with strength training and cardio in one cohesive weekly schedule. Google calendar and all!

Common Mistakes

Mistake 1: Skipping This Entirely

“I don’t have time” → You’ll have time for physical therapy after you get injured.

Falls, joint pain, and mobility restrictions cost more time (and money) than 10 minutes of preventive work twice a week.

Mistake 2: Rolling Too Fast

Foam rolling isn’t about speed. Slow, deliberate, pause on tender spots.

If you’re rolling back and forth quickly, you’re not breaking up adhesions: you’re just bruising tissue.

Mistake 3: Only Stretching Tight Muscles

You also need to strengthen weak/inhibited muscles. Sometimes, the reason a muscle is tight is because of an antagonist being tight too.

Example: Tight hip flexors often mean weak glutes. Stretching hip flexors helps, but strengthening glutes fixes the root cause.

Mistake 4: Ignoring Feet

Your feet are your foundation. Weak, stiff feet = problems upstream (knees, hips, back).

Do toe yoga. Roll your feet. Strengthen your ankles with single-leg balance work on the rebounder.

Mistake 5: Waiting Until You’re In Pain

This is preventive maintenance, not reactive treatment.

Don’t wait until you’re injured to start mobility work. By then, you’re in recovery mode (which takes longer).

Resources

I’ll be sharing all my resources in upcoming posts: the YouTube channels I use for form checks and programming, the gear I’ve collected (mostly second-hand and budget-friendly), and exactly how I structure my week to cover all of the exercise pillar (strength, cardio, balance, mobility, and plyometrics) in less than 3% of my time.

You don’t need expensive equipment or a gym membership. You need the right tools and a simple system.

More on that soon.

What’s Next

Next week: Book Club: Next Level by Stacy Sims

Stacy Sims wrote Next Level specifically for women navigating perimenopause and menopause. It’s THE book on exercise and nutrition for hormonal changes.

We’re breaking down:

• What Sims gets right (a lot)

• What to skip (some recommendations don’t align with SAM)

• How Next Level fits the Swiss Army Mum approach

• Who should read it

After that: Behind the scenes - My Exercise Routine and setup. How I make sure I lift, do HIIT, plyometrics and balance/stability/mobility in less than 3% of my time. I’ll also share my setup (mostly thrifted!) and the free YouTube ressources I use every week.

Subscribe so you don’t miss it!

Subscribe now

Your Turn

Do you do any mobility or balance work currently?

What’s the tightest area in your body right now (hips, shoulders, lower back)?

Have you experienced any falls or near-falls? What happened?

Drop a comment. I read every one.

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

Thank you!

Thanks for reading Swiss Army Mum! If this resonated, forward it to someone who might benefit or hit the ♥️ button. It helps more people discover this work.

Share Swiss Army Mum

This is Part 2 of a 3-part deep-dive series on exercise.

We have covered the Exercise Blueprint: the overview of all six movement types and the 80/20 minimum (steps + strength 2x/week).

Now we’re zooming in. This mini-series breaks down the three essential categories of exercise:

• Part 1: Strength Training - How muscle is built, the 6-step bracing protocol, lifting heavy

• Part 2 (this post): Cardio - Zone 2 mechanism, HIIT VO₂ max and hormonal advantages

• Part 3: Balance, Mobility & Plyometrics - Neuromuscular control, falls prevention, improving bone density

This post sits in the Exercise area of the Body Pillar, specifically in the Cardio component. Within Exercise, Cardio contains two distinct training modes: Zone 2, which charges your metabolic battery slowly so it holds more capacity, and HIIT, which drains it completely and forces adaptation. They do different jobs at the cellular level, and both belong in the programme. This post covers what separates them, why each matters specifically after 35, and how to use both without the time investment most people assume is required.

Most Women Get Cardio Wrong

Me included! I’ve never liked cardio. Running felt like punishment. Spin classes left me drained. I’d rather lift weights or do bodyweight work: anything but steady-state cardio.

So I skipped it. For years. I figured strength training was enough.

Like me, most women either skip cardio entirely or do too much of the wrong kind. They think cardio means running on a treadmill for an hour. Or they do spin classes 5x/week and wonder why they’re exhausted, constantly hungry, and not seeing results.

Then I learned about VO₂ max. Cardiovascular fitness is one of the strongest predictors of lifespan: stronger than BMI, stronger than cholesterol. People in the top 20% for VO₂ max live significantly longer than those in the bottom 20%. And you can’t build VO₂ max with strength training alone.

That got my attention.

But here’s what changed my mind completely: you don’t need hours of cardio. You need 150 minutes of Zone 2 per week (five 30-minute walks) and 20 minutes of HIIT (two 10-minute sessions). That’s 1.7% of your week.

I can do 1.7%.

There are two types of cardio that matter, and they serve two different purposes.

• Zone 2 cardio (moderate intensity, conversational pace) builds your aerobic base: mitochondrial health, fat oxidation, cardiovascular efficiency.

• HIIT (high-intensity interval training) boosts your VO₂ max and provides hormonal advantages that are especially valuable for women navigating perimenopause and menopause.

You need both. But you don’t need hours. And you definitely don’t need to do HIIT every day (more on that later, it’s a fast track to burnout).

This post breaks down what each type of cardio does, the mechanisms behind the adaptations, how much you actually need, and how to do it right.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

Why It Matters

Cardio Isn’t Just “Burning Calories”

Most women think cardio is about burning calories. Burn 300 calories in a 30-minute run, eat 300 fewer calories, lose weight.

But that’s not how it works. You can’t outrun a bad diet. One muffin and a latte = 500 calories. A 30-minute run burns ~300 calories. The math doesn’t work.

Here’s what cardio actually does:

• Improves cardiovascular fitness (VO₂ max): Your VO₂ max (the maximum amount of oxygen your body can use during intense exercise) is one of the strongest predictors of lifespan. Not weight. Not BMI. Aerobic capacity.

• Builds aerobic efficiency (Zone 2): Moderate-intensity cardio increases mitochondrial density, improves fat oxidation, and enhances metabolic flexibility. Your body gets better at using fat for fuel, which stabilizes energy and reduces glucose spikes.

• Provides hormonal stimulus (HIIT): High-intensity intervals trigger hormonal responses that declining estrogen and progesterone no longer provide. For women in perimenopause and menopause, HIIT “picks up the slack” for hormonal changes.

The Dose-Response Data

A landmark study1 on sedentary postmenopausal women tested different doses of moderate cardio to see what actually works.

Here’s the key insight: ~150 min/week captured roughly 80% of the maximal fitness gain. Think of it like charging a battery: the first 80% charges fast, the last 20% takes forever.

You get most of the cardiovascular benefit at 150 minutes per week (2.5 hours, or five 30-minute walks). More helps, but returns diminish sharply.

Zone 2 Cardio

What it is

Zone 2 is moderate-intensity aerobic exercise. You’re working, but you can still hold a conversation. Your breathing is elevated, but you can speak in full sentences.

Heart rate: 60-70% of your max heart rate (220 - your age)

Examples:

• Brisk walking

• Easy cycling

• Swimming at a steady pace

• Light jogging (if you can still talk)

• Elliptical or rowing at moderate pace

The “talk test”: If you can speak in full sentences but your breathing is noticeably elevated, you’re in Zone 2. If you’re gasping for air, you’re too high. If you can sing, you’re too low.

The Mechanism

You’ve probably heard that “Zone 2 is optimal for mitochondrial health” or “Zone 2 is the best for fat burning.” That’s not entirely accurate. Recent research challenges this.

A 2025 review by Storoschuk et al. titled “Much Ado About Zone 2” examined the claim that Zone 2 training is uniquely optimal for mitochondrial adaptations. The reality: in non-elite populations, higher-intensity training produces greater mitochondrial adaptations than Zone 22.

Zone 2 is still valuable. It builds more mitochondria (your cells' energy factories), grows new capillaries around muscle fibers (better oxygen delivery), and trains your body to burn fat efficiently. The big advantage: you can accumulate 150-300 minutes per week without burning out or getting injured—something you can't do with high-intensity work. Over time, your body gets better at switching between burning carbs and fat depending on what you're doing. Think of Zone 2 as building your aerobic engine's capacity without redlining it.

How Much You Need

The evidence shows 150 min/week captures ~80% of the maximal fitness gain. You can do more (up to 300 min/week for additional benefit), but returns diminish.

How to know if you’re in Zone 2

Method 1: Calculate your Zone 2 heart rate

If you track your heart rate, you can target zone 2 by knowing what that means to you.

• Max HR = 220 - your age

• Zone 2 = 60-70% of max

Example (40 years old):

• Max HR = 220 - 40 = 180 bpm

• Zone 2 = 180 × 0.6 to 180 × 0.7 = 108-126 bpm

Method 2: Talk test

Can you speak in full sentences? Breathing is elevated but you’re not gasping? You’re in Zone 2.

Method 3: Rate of Perceived Exertion (RPE)

On a scale of 1-10: Zone 2 = 5-6 out of 10 (moderate effort, sustainable for 30-60 minutes)

HIIT - High Intensity Interval Training

What It Is

HIIT (High-Intensity Interval Training) is simple: short bursts of maximum effort followed by rest. You go all-out for 10-30 seconds (as hard as you possibly can) then rest for 20-60 seconds while you recover. Repeat. The entire session, including warm-up and cool-down, takes 10-20 minutes.

Here’s the test: during the work intervals, you should be breathless, unable to speak. If you can hold a conversation during a work interval, you’re not going hard enough. It’s not HIIT—it’s just moderate cardio with breaks.

HIIT is uncomfortable. That’s the point. The intensity is what triggers the hormonal cascade and metabolic adaptations. Without that intensity, you’re missing the entire benefit.

A women-only systematic review and meta-analysis found that HIIT and moderate-to-vigorous continuous training produce similar VO₂max improvements in women3.

So HIIT’s main advantage isn’t superior cardio gains: it’s time-efficiency but also hormonal benefits.

The Mechanism + Hormonal Advantages

HIIT works because it creates massive metabolic stress: your body scrambles to adapt.

The Metabolic Mechanism

When you go all-out during a HIIT interval, you’re essentially draining your cellular battery. Your muscles burn through ATP (the energy currency cells use) faster than your body can replenish it. Breakdown products accumulate—like a low-battery warning light flashing on your dashboard.

That warning light triggers your cell’s energy sensor, which acts like a metabolic fire alarm: “We’re running out of fuel! Adapt!” The response is immediate: build more mitochondria (energy factories), improve glucose uptake (cells become more insulin-sensitive), and enhance fat-burning capacity.

Meanwhile, your cardiovascular system scrambles to keep up. Your heart, lungs, and blood vessels are pushed to their limit. They adapt by increasing capacity—improving your VO₂ max (peak aerobic capacity), which happens to be one of the strongest predictors of how long you’ll live.

The result: your muscles become dramatically more responsive to insulin, pulling glucose out of your bloodstream more efficiently than they would with steady-state cardio. HIIT rewires your metabolism in ways that moderate exercise simply doesn’t.

The Hormonal Mechanism

During perimenopause and menopause, estrogen and progesterone decline. These hormones previously supported muscle mass, bone density, metabolic function, cardiovascular health, and mood.

HIIT doesn’t replace hormones, but it provides similar metabolic signals: telling your body to maintain muscle, burn fat efficiently, and keep your metabolism running. Think of HIIT as a metabolic wake-up call for a body that’s losing its hormonal “volume control.”

Here’s what HIIT does:

• Increases human growth hormone (HGH) and testosterone (supports muscle, libido, energy, bone density)

• Decreases estrone (the less favorable estrogen from fat tissue)

• Counteracts cortisol (when done 2x/week, overdoing it backfires)

• Boosts BDNF (brain-derived neurotrophic factor, combats brain fog)

This is why HIIT is particularly valuable for women over 35. It “picks up the slack” for declining estrogen and progesterone.

How Much You Need

Frequency: 2x/week maximum

More is not better. HIIT is strong medicine. Overdoing it leads to cortisol overload, burnout, injury, diminishing returns.

Duration: 10-20 minutes per session (including warm-up/cool-down)

Critical Rules for HIIT

Go HARD during work intervals

RPE 9-10 (as hard as you can go). You should be breathless, unable to speak. If you can hold a conversation, it’s not HIIT.

Rest adequately between intervals

Use the full rest period. Walk around, breathe, recover. You need to be able to go hard again on the next interval. Make sure you can fully recover during rest so you can go all in again on the next round.

2x/week maximum

More = diminishing returns + burnout.

How Little Cardio You Actually Need

Here’s the breakdown:

• Zone 2: 150 min/week = 1.5% of your week

• HIIT: 20 min/week = 0.2% of your week

• Total: 170 min/week = 1.7% of your week

That’s five 30-minute walks and two 10-minute HIIT sessions.

Compare that to:

• Average TV/Netflix: 3 hours/day = 21 hours/week = 12.5% of your week

• Average social media: 2.5 hours/day = 17.5 hours/week = 10.4% of your week

You have time. It’s about priorities, not availability.

Sample weekly schedule

This is how I organise my cardio throughout the week (as well as the strength training) Your schedule will look different, but this gives you a template.:

• Monday: Morning walk with my dog (30 min) + Walking pad after dinner (10-20 min)

• Tuesday: Morning walk with my dog (30 min) + Walking pad after dinner (10-20 min)

• Wednesday: Morning walk with my dog (30 min) + HIIT (10-15 min) + Strength training (30 min) + Walking pad after dinner (10-20 min)

• Thursday: Morning walk with my dog (30 min) + Walking pad after dinner (10-20 min)

• Friday: Morning walk with my dog (30 min) + Strength training (30 min) + Walking pad after dinner (10-20 min)

• Saturday: Morning walk with my dog (30 min) + Walking pad after dinner (10-20 min)

• Sunday: Morning walk with my dog (30 min) + HIIT (10-15 min) + Strength training (30 min) + Walking pad after dinner (10-20 min)

You’ll notice that makes more than 150 min of moderate cardio. That’s because some days I walk less in the morning (the days I need to commute) and others I walk more (typically on the weekends). I also don’t always use the treadmill after dinner.

It’s not about perfection, it’s about making it work with you and showing up consistently.

Common Mistakes

Mistake 1: Doing HIIT Every Day

HIIT is not cardio for daily use. 2x/week max.

More = cortisol overload, burnout, injury, sleep disruption. If you’re exhausted all the time, you’re doing too much HIIT.

Mistake 2: Not Going Hard Enough in HIIT

If you’re not breathless and needing the rest interval, you’re not doing HIIT. You’re doing moderate cardio with intervals.

HIIT should feel hard. Uncomfortable. That’s the point.

Mistake 3: Skipping Zone 2 Entirely

HIIT alone won’t build your aerobic base. You need volume (Zone 2) + intensity (HIIT) for complete cardiovascular fitness.

Mistake 4: Doing “Moderate” Cardio in No Man’s Land

Too hard to be Zone 2 (not building aerobic base efficiently), too easy to be HIIT (not getting hormonal benefits).

Pick a lane: Zone 2 or HIIT. Don’t live in the middle.

Mistake 5: Adding HIIT Before Building a Base

If you’re completely new to exercise, build a Zone 2 base first (8-12 weeks), then add HIIT.

HIIT is advanced work. You need cardiovascular and neuromuscular readiness.

What’s Next

Next week: Balance, Mobility & Plyometrics

We’re diving into:

• The neuromuscular control system (how balance actually works—visual, vestibular, proprioceptive systems)

• Proprioception explained (mechanoreceptors in muscles, tendons, joints)

• Why balance training reduces fall risk by 23%

• Core stability (360° breathing, not just abs)

• Fascia care (foam rolling, why it matters)

This is the “boring” work that prevents falls, keeps you functional, and allows you to lift heavy and do HIIT safely.

After that: Book Club: Next Level by Stacy Sims. The exercise and nutrition book written specifically for women navigating perimenopause and menopause. What she gets right, what to skip, and how it aligns with SAM.

Subscribe so you don’t miss it!

Subscribe now

Your Turn

Are you doing Zone 2? Or have you been living in “moderate cardio no man’s land”?

Have you tried HIIT? What protocol worked for you?

What’s holding you back from adding cardio to your routine?

Drop a comment. I read every one.

Thank You

Thanks for reading Swiss Army Mum! If this resonated, forward it to someone who might benefit or hit the ♥️ button. It helps more people discover this work.

Share Swiss Army Mum

This is Part 1 of a 3-part deep-dive series on exercise.

We have covered the Exercise Blueprint: the overview of all six movement types and the 80/20 minimum (steps + strength 2x/week).

Now we're zooming in. This mini-series breaks down the three essential categories of exercise:

• Part 1 (this post): Strength Training - How muscle is built, the 6-step bracing protocol, lifting heavy

• Part 2: Cardio - Zone 2 mechanism, HIIT hormonal advantages

• Part 3: Balance, Mobility & Plyometrics - Neuromuscular control, falls prevention, improving bone densitya

This post sits in the Exercise area of the Body Pillar, specifically in the Strength component. The Exercise area has three components: Strength, Cardio, and Balance/Mobility/Plyometrics. Strength is the non-negotiable one: it has the most direct impact on metabolic health, bone density, and functional independence across the decades, and it is the component most women over 35 are still under-investing in. If you only do one thing in the Exercise area, this is it.

I Was Lifting, But Not Heavy Enough

I’ve always hated cardio. Running on a treadmill felt like torture. I’d rather lift weights, do bodyweight exercises, anything but steady-state cardio.

So I lifted. I did squats and lunges. I used dumbbells. I felt strong. But I wasn’t lifting heavy enough.

I was doing 15-20 reps with light weights. I thought that’s what women were supposed to do: ”tone” without “bulking.” I avoided the heavy barbell. I never pushed myself to lift 6 reps or less with maximum weight. I stayed comfortable.

Then I learned about sarcopenia.

Sarcopenia is the age-related loss of muscle mass and strength. After 30, you lose 3-8% of muscle mass per decade. This isn’t just “aging.” This is neglect.

And here’s the thing: light weights for high reps won’t save you from sarcopenia. If you can do 15-20 reps, you’re building muscular endurance, not strength. You’re not signaling your body to keep (or build) muscle mass. Only heavy resistance training does that.

Muscle isn’t vanity. It’s your metabolic engine. It regulates glucose, protects your bones, supports your joints, and keeps you functional at 75, 80, 85. Lifting heavy isn’t about looking huge. It’s about staying strong.

This post breaks down why strength training is non-negotiable for women over 35, how muscle is actually built, and how to lift safely.

Why It Matters

Sarcopenia is Not Optional

The European consensus on sarcopenia defines it as progressive loss of skeletal muscle mass, strength, and function. It’s associated with increased risk of falls, fractures, disability, loss of independence, and mortality.

After 30, you lose 3-8% of muscle mass per decade.

This isn’t “normal aging.” It’s preventable. Progressive resistance training reverses sarcopenia at any age. This graph gave me a new perspective:

After 30, muscle decline is physiological. However, depending on how active you are and, especially how much you lift, the trajectory is vastly different. We’re talking about avoiding the “disability threshold” altogether.

That right there is why you lift.

Muscle is a Metabolic Organ

Most people think of muscle as structural: it helps you move. But muscle is also metabolic. It regulates glucose, influences insulin sensitivity, and has a favorable effect on metabolic syndrome.

Here’s what muscle does:

• Regulates glucose: Muscle acts as a glucose sink. When you move, your muscles pull glucose out of your bloodstream without needing insulin. The more muscle mass you have, the better your glucose regulation.

• Protects bones: Strength training doesn’t just build muscle: it builds bone. The LIFTMOR trial1 in postmenopausal women with osteopenia/osteoporosis showed that twice-weekly heavy resistance training plus impact loading improved lumbar spine bone mineral density by +2.9% compared to −1.2% in controls over 8 months. Functional measures also improved significantly.

• Supports joints: Strong muscles take load off vulnerable joints. Weak quads = more stress on knees. Weak glutes = more stress on hips and lower back. Strength training protects your joints by distributing load properly.

• Maintains metabolic rate: More muscle tissue means your body burns more energy at rest. This isn’t about “burning calories”: it’s about metabolic health. Muscle is metabolically active tissue.

“But I Don’t Want to Get Bulky”

Let’s address this directly: women do not have enough testosterone to “bulk up” without significant, intentional effort.

The women you see with large, defined muscles are either:

• Genetic outliers

• Training specifically for hypertrophy (bodybuilding) with high volume, high frequency, and precise nutrition

• Using performance-enhancing drugs

What you’ll get from lifting heavy 2-3x/week:

• Better posture

• Functional strength (carrying groceries, lifting kids, climbing stairs)

• Bone density

• Metabolic health (insulin sensitivity, glucose regulation)

• Injury prevention (strong muscles protect joints)

You’ll look strong, not huge. You’ll be able to get off the floor without using your hands. That’s the goal.

How Muscle is Built: The Mechanism

Understanding how muscle actually grows helps you understand why certain training approaches work and others don’t.

Think of muscle building like construction: lifting weights sends the signal, your body does the building, and protein provides the materials.

The Process

1. You send the signal: Mechanical tension + metabolic stress

When you lift heavy weights2, you’re essentially telling your body: “We need to be stronger for this.”

You create two types of stress:

Mechanical tension = The physical force of contracting against resistance. Imagine stretching a rubber band to its limit. That tension signals your muscles that they need to get stronger to handle the load.

Metabolic stress = Depleting your energy stores (like draining a battery) and accumulating byproducts (like lactic acid: the burn you feel). Think of this as your muscle cells saying “We ran out of fuel doing that work. We need more capacity.”

Both types of stress trigger molecular signals that tell your body: “Build more muscle to handle this better next time.”. An excellent example of a biological system getting stronger from stress.

2. Your body responds: Muscle protein synthesis (MPS) kicks in

After you lift, your body initiates a repair-and-upgrade process called muscle protein synthesis: building new muscle proteins to make your muscles bigger and stronger.

Here’s the timeline3:

• 4 hours after lifting: Protein synthesis up ~50%

• 24 hours after lifting: Protein synthesis up ~109% (more than double baseline)

• 36 hours after lifting: Back to normal

The key insight: You don’t build muscle during the workout. You build it during the 24-48 hours of recovery.

This is why rest days matter. This is why sleep matters. This is why you can’t train the same muscles every day: you’d interrupt the construction process.

Key Takeaway From The Mechanism

Recovery is where growth happens: Each workout triggers a 24-48 hour window of elevated MPS. If you train the same muscles again before this window closes, you interrupt the growth process. This is why 48-72 hours rest between sessions targeting the same muscle groups is critical.

Protein intake matters: Consuming protein post-workout maximizes MPS. Your muscles are primed to use amino acids for repair and growth during this window.

Progressive overload is essential: Your body adapts to the stimulus you give it. If you lift the same weight for the same reps every session, MPS won’t be triggered as strongly. You need to progressively increase weight, reps, or sets over time to keep signaling growth.

The 6-Step Bracing Protocol

Most lifting injuries happen because of poor form, not because the weight is too heavy. This bracing protocol teaches you how to create 360° core stability before you lift and protect your spine.

Master this unloaded first. Practice it standing with no weight. Then with an empty barbell. Then add load.

Step 1: Screw Your Feet Into the Ground

Stand with feet shoulder-width (or slightly wider for squats/deadlifts). Exert outward force from your hips as if you’re trying to twist the ground apart with your feet. You’re not actually moving your feet: you’re creating external rotation force from the hip joint.

Why this matters: Activates your glutes and stabilizes your pelvis. Creates a stable base for everything above.

Step 2: Squeeze Your Glutes

With feet screwed into the ground, squeeze your glutes hard. This sets your pelvis in a neutral position and prevents hyperextension of your lower back.

Why this matters: A neutral pelvis is critical for spinal safety. If your pelvis tilts forward (anterior pelvic tilt), your lower back hyperextends and becomes vulnerable to injury.

Step 3: Inhale and Lock It In

Take a big breath into your diaphragm (not your chest) while keeping your glutes engaged. Your belly, sides, and lower back should expand. This locks your pelvis and rib cage together, creating a stable cylinder.

Why this matters: Creates intra-abdominal pressure: the internal “brace” that protects your spine. Intra-abdominal pressure acts like a pressurized balloon inside your torso, stiffening your core.

Step 4: Exhale and Balance Your Rib Cage

Exhale slowly while tightening your belly. You’re not sucking in: you’re stiffening your abdominal wall to maintain IAP. Your rib cage should sit directly over your pelvis (not flared up or jutting forward).

Why this matters: Balances the rib cage over the pelvis, maintaining IAP while allowing you to breathe during the lift. This is the “locked” position you’ll maintain throughout the movement.

Step 5: Neutralize Head and Shoulders

Rotate your shoulders back (external rotation). Imagine widening your collarbones. Turn your palms up slightly. Your head should be in a neutral position: ears over shoulders, eyes looking slightly forward (not up or down).

Why this matters: Optimal spinal alignment from head to pelvis. This position allows force to transfer efficiently through your kinetic chain without compensations.

Step 6: Stand Fully Braced

This is your braced position. Every rep of every lift starts and ends here.

This protocol is synthesized from Dr Kelly Starrett (Becoming a supple leopard) and Stacy Sims, PhD (Next Level).

Compound Lifts: The Big 5

Compound lifts work multiple large muscle groups at once. They’re functional (mimic real-life movement patterns), efficient (you can train your whole body in 30-45 minutes), and effective (you can lift heavy with compound movements).

These five movements cover all the major patterns you need.

1. Squat (Lower Body Push)

What it works: Quads, glutes, hamstrings, core

Why it matters: Sitting and standing is a fundamental life skill. Squatting keeps you functional.

How to do it:

• Feet shoulder-width or slightly wider

• Toes slightly turned out

• Brace (6-step protocol)

• Push hips back, bend knees, lower until hips are below knees (full depth)

• Knees track over toes (don’t cave inward)

• Drive through heels to stand

Common mistakes: Not squatting to depth, knees caving in, losing bracing, heels lifting off ground

Variations: Back squat (barbell on back), front squat (barbell on front), goblet squat (dumbbell or kettlebell)

2. Deadlift (Hip Hinge)

What it works: Posterior chain (glutes, hamstrings, lower back, upper back)

Why it matters: Picking things up off the ground is the most functional movement there is. Deadlifts teach you to hinge at the hips without rounding your back.

How to do it:

• Feet hip-width, barbell over mid-foot

• Brace (6-step protocol)

• Hinge at hips, grab bar (hands just outside legs)

• Flat back (neutral spine), chest up

• Drive through heels, extend hips and knees simultaneously

• Bar stays close to body the entire time

• Lock out at top (glutes squeezed, hips fully extended)

Common mistakes: Rounding lower back, starting with hips too low (turning it into a squat), bar drifting away from body

Variations: Conventional deadlift, sumo deadlift, Romanian/russian deadlift (RDL)

3. Chest Press (Horizontal Push)

What it works: Chest (pectorals), shoulders (anterior deltoids), triceps

Why it matters: Pushing movement: pushing open doors, pushing a stroller, getting up from the floor.

How to do it:

• Lie on bench (or floor)

• Feet flat on ground

• Brace (6-step protocol)

• Grip barbell slightly wider than shoulder-width

• Lower bar to chest (elbows at ~45° angle, not flared out to 90°)

• Press bar up until arms fully extended

Common mistakes: Elbows flared out to 90° (puts shoulder at risk), arching back excessively, not using leg drive

Variations: Barbell bench press, dumbbell bench press, floor press, push-ups

4. Overhead Press (Vertical Push)

What it works: Shoulders (deltoids), triceps, core

Why it matters: Lifting things overhead: putting luggage in overhead bin, lifting boxes onto shelves.

How to do it:

• Standing, feet shoulder-width

• Brace (6-step protocol)

• Barbell or dumbbells at shoulder height

• Press straight up (bar path should be vertical, close to face)

• Lock out arms overhead (biceps by ears)

• Lower under control

Common mistakes: Leaning back excessively (compensating for weak core or tight shoulders), not locking out fully, pressing forward instead of straight up

Variations: Barbell overhead press, dumbbell overhead press, push press (uses legs)

5. Row (Horizontal Pull)

What it works: Back (lats, rhomboids, traps), biceps, rear deltoids

Why it matters: Pulling movements, posture (counteracts hunched-over desk posture).

How to do it:

• Bent-over: Hinge at hips, flat back, knees slightly bent

• Brace (6-step protocol)

• Barbell or dumbbells hanging straight down

• Pull weight to lower rib cage (not to chest)

• Squeeze shoulder blades together at top

• Lower under control

Common mistakes: Rounding back, using momentum (swinging), pulling too high (to chest instead of ribs)

Variations: Bent-over barbell row, dumbbell row (single-arm), seated cable row, inverted row (bodyweight), pull-ups

How Heavy is “Heavy”?

Heavy means 6 reps or less with as much weight as you can safely handle.

If you can do 10+ reps, the weight is too light for building strength. You’re training muscular endurance, not strength.

The last 1-2 reps of each set should be hard. You should feel like you could maybe do one more rep with good form, but not three more.

If your form breaks down, the weight is too heavy. Drop the weight, fix your form, then progress.

Progression for Beginners

Don’t jump straight into heavy lifting. Build a foundation first.

Weeks 1-6: Learn the movements

• Load: Moderate (you could do 8-15 reps)

• Volume: 2-3 sets of 8-15 reps

• Focus: Perfect form, bracing protocol, full range of motion

Weeks 7-12: Increase intensity

• Load: Heavy (5-6 reps per set)

• Volume: 5 sets of 5 reps

• Focus: Progressive overload (add 2.5-5 lbs per week)

Weeks 13+: Heavy lifting

• Load: Heavy to very heavy (3-5 reps per set)

• Volume: 4-6 sets of 3-5 reps

• Focus: Consistent progression, maintain form

Frequency & Recovery: How Much Do You Actually Need?

This is where the research gets specific for women over 35. Recent studies distinguish between strength gains (how much you can lift) and hypertrophy (muscle growth). The dose you need depends on your goal.

Strength Gains: Less Than You Think

Here’s surprising news: research on women over 35 shows that even 1x/week produces measurable strength gains. You won’t optimize muscle growth at that frequency, but you’ll get stronger.

Think of it like learning a language: one lesson per week keeps you progressing, but three lessons per week gets you fluent faster4.

Key takeaway: If your primary goal is strength (getting stronger, building functional capacity), 2x/week is optimal for women over 35, but even 1x/week produces substantial gains if you train hard (close to failure).

Hypertrophy: You Need More Volume

For muscle growth, frequency matters more. A 12-week study in postmenopausal women (average age 60) compared high-volume vs low-volume training. Both groups got stronger, but only the high-volume group built significant muscle mass5.

Key takeaway: For hypertrophy (muscle growth), you need 2-3x/week with higher volume (3-6 sets per exercise).

Recovery Between Sessions

48-72 hours rest between sessions targeting the same muscle groups because muscle protein synthesis stays elevated for 24-48 hours post-workout. Training the same muscles again before this window closes interrupts the growth process.

Progressive Overload is Non-Negotiable

Your body adapts to stress. If you lift the same weight every session, muscle protein synthesis won’t be triggered strongly enough.

Ways to progress:

1. Add weight: 2.5-5 lbs (1-2.5 kg) on lower body, 2.5 lbs (1 kg) on upper body

2. Add reps: If you hit 12 reps, increase weight and drop back to 6-8 reps

3. Add sets: Go from 2 sets to 3 sets over 4-6 weeks

Your body adapts to the stimulus you give it. If you lift the same weight for the same reps every session, MPS won’t be triggered as strongly.

Full body or body-part specific?

Most strength training programs fall into two categories: full-body (training all major muscle groups each session) or split training (upper/lower, push/pull/legs, or body-part splits).

I do full-body workouts, and here’s why:

1. Shorter sessions: You rotate between muscle groups, so rest time is minimized. Legs recover while you do chest press. Chest recovers while you row. You can finish a session in 30-45 minutes instead of 60+ minutes for a body-part split.

2. If you miss a session, you haven’t neglected an entire body part: Life happens. With full-body, every session hits everything. You’re never more than 3-4 days from training any muscle group. With splits, missing “leg day” means 7-10 days without training legs.

3. Frequency is built in: Training each muscle group 2-3x/week maximizes hypertrophy. With full-body 2-3x/week, you automatically hit optimal frequency. With splits, you need 4-6 days/week to match that.

If you’re training 4-6 days/week and have time for longer sessions, splits can work. But for most women juggling work, kids, and life? Full-body 2-3x/week is the 80/20 answer.

The 80/20 for Women Over 35

Based on evidence in women over 35:

Optimal dose (Strength + Hypertrophy) - The balanced approach:

• 2-3x/week, 3-6 sets per exercise

• Moderate-to-heavy loads (70-85% 1RM, 6-12 reps)

• Compound lifts with progressive overload

• This maximizes both strength and muscle growth

Even 1x/week produces strength gains, but 2x/week is the evidence-based minimum for muscle maintenance and growth in women over 35.

Good news, there are free programs on YouTube that do precisely this, so you don’t need to plan for all of this for your workouts (see resources below).

Common Mistakes

Mistake 1: Not Lifting Heavy Enough

If you’re doing 15-20 reps, you’re not building strength. You’re building muscular endurance.

For strength and muscle mass, you need to lift heavy (6 reps or less). The weight should be challenging (but you should always maintain good form).

Mistake 2: Skipping the Bracing Protocol

Most lifting injuries happen because of poor form, not because the weight is too heavy.

Practice the 6-step bracing protocol unloaded first. Make it automatic. Then add weight.

Mistake 3: Not Resting Between Sets

Strength training is not cardio. Rest is part of the protocol.

If you’re breathless and can’t complete the next set with good form, you didn’t rest long enough.

Mistake 4: Doing Too Much Volume

More is not better. 3-5 sets per exercise is sufficient for most people.

If you’re doing 10 sets of squats, you’re either:

1. Not lifting heavy enough

2. Overtraining (diminishing returns + injury risk)

Lift heavy, rest adequately, go home.

Mistake 5: Training the Same Muscles Every Day

You build muscle during recovery, not during the workout. If you train the same muscles every day, you interrupt the muscle protein synthesis window.

Train each muscle group 2-3x/week with 48-72 hours rest between sessions.

Resources

All this information may seem too much to handle. But it’s not!

You don’t need a $1,500 dumbbell set. You don’t need a gym membership. You don’t need fancy equipment.

I strength train at home with second-hand gear (I’m thrifty!). It works. For form checks and programming, I use free YouTube channels. I’ll share which ones later in this series. Once a year, I sit down and program my strength sessions using those videos, and then every workout is ready with a few clicks. No thinking, no decision fatigue, just lift.

What’s Next

Next week: Cardio - Zone 2 + HIIT

We’re breaking down two types of cardio for two different purposes:

• Zone 2: Builds aerobic base, mitochondrial health, fat oxidation

• HIIT: Boosts VO₂ max and provides hormonal advantages for menopausal women

How much you need (less than you think), how to calculate your zones, and why HIIT is especially valuable for women over 35.

After that: Balance, Mobility & Plyometrics. The neuromuscular control system explained, proprioception, and why this “boring” work prevents falls and keeps you functional.

Subscribe, so you don’t miss it!

Subscribe now

Your Turn

Have you been avoiding strength training? What’s holding you back?

Are you lifting, but not lifting heavy enough (15-20 rep range)?

Which of the Big 5 lifts are you most intimidated by?

Drop a comment. I read every one.

Thank you!

Thanks for reading Swiss Army Mum! If this resonated, forward it to someone who might benefit or hit the ♥️ button. It helps more people discover this work.

Share Swiss Army Mum

We started with the Body pillar, because without physical foundations, nothing else sticks. First up was Sleep - the non-negotiable foundation, followed by Fuel - the master lever for metabolic health.

This week: Exercise. Not for aesthetics. For metabolic health and functional independence.

This post sits in the Exercise area of the Body Pillar. Exercise is the third leg of the Body triad: Sleep sets the conditions, Fuel sends the signals, and Exercise builds the structure. This is the blueprint for the whole Exercise area, making the case for why muscle is a metabolic organ long before it is an aesthetic one, and why that matters specifically for women over 35. The detailed posts on Strength training, Cardio, and Balance and Mobility follow from here.

I Used to Think Exercise Was About Losing Weight

I used to think exercise was about losing weight. Burn calories. Get smaller. Look better.

Then I read the research.

Exercise isn’t about aesthetics. It’s medicine. The single best intervention for metabolic health, disease prevention, and functional independence.

And here’s the part that surprised me: you need less than you think.

Large prospective studies show that ~75 min/week of moderate-intensity activity is already associated with meaningfully lower risk of premature death (compared to being inactive). ~150 min/week achieves near-maximal risk reduction for all-cause mortality, and further gains from ~300 min/week are smaller. That’s 1.5% of your week for most of the benefit1.

Fat loss might happen as a side effect if you sleep well, eat for glucose stability, and move consistently. But that’s not the main goal. The goal is staying functional at 75. Getting off the floor without using your hands at 80. Carrying groceries, hiking, playing with grandkids.

This post breaks down the types of exercise that matter, how much you actually need, and the 80/20 that gives you the most bang for your buck.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

Why It Matters

"If exercise could be packed into a pill, it would be the single most widely prescribed, and beneficial, medicine in the nation."

— Robert Butler, MD

Exercise is Metabolic Medicine

Most women associate exercise with weight loss. The fitness industry has drilled this into us: burn calories, shrink your body, fit into smaller clothes.

But exercise doesn’t work that way. You can’t outrun a bad diet. A 30-minute run burns ~300 calories. One muffin and a latte = 500 calories. The math doesn’t add up, and chasing weight loss through exercise alone is exhausting and demoralizing.

Here’s what exercise actually does:

Regulates glucose: Muscle acts as a glucose sink. When you move, your muscles pull glucose out of your bloodstream without needing insulin. Strength training improves insulin sensitivity, meaning your body needs less insulin to manage blood sugar. This matters for metabolic health, energy stability, and disease prevention.

Protects against chronic disease: Regular exercise reduces your risk of type 2 diabetes, cardiovascular disease, dementia, and certain cancers. Not because you’re thinner. Because your mitochondria work better, your inflammation is lower, and your metabolic pathways are healthier.

Supports bone density: Weight-bearing exercise signals your bones to stay strong. After menopause, when estrogen drops, bone density declines rapidly. Strength training and plyometrics counter this. The LIFTMOR trial2 in postmenopausal women with osteopenia/osteoporosis showed that twice-weekly heavy resistance training plus impact loading improved bone mineral density in controls over 8 months. Functional measures also improved significantly: timed-up-and-go and leg strength.

Maintains muscle mass: After 30, you lose 3-8% of muscle mass per decade (sarcopenia3). By 80, you’ve lost 30-50% unless you lift. Muscle isn’t vanity: it’s your metabolic engine, your glucose regulator, and your structural support.

Exercise is Functional Independence

Forget the scale. Here’s what matters:

• Can you get off the floor without using your hands?

• Can you carry a suitcase up stairs?

• Can you play with your grandkids without getting winded?

• Can you hike, garden, travel, and live on your own terms at 75? 80? 85?

Sedentary aging means losing independence. You can’t climb stairs. You can’t lift a bag of groceries. You need help getting dressed. Falls become life-threatening.

A Cochrane systematic review4 found that exercise reduces fall rate by ~23% overall in older adults, with the strongest evidence for balance/functional training and multicomponent programs.

Exercise is insurance against that future.

The Longevity Connection

VO₂ max, your cardiovascular fitness, measured as how much oxygen your body can use during intense exercise, is one of the strongest predictors of lifespan.

People in the top 20% for VO₂ max live significantly longer than those in the bottom 20%.

Body Recomposition: The Side Effect, Not the Goal

If you sleep well, eat for glucose stability, and move consistently (strength training + cardio + daily steps) body recomposition will happen. You’ll build muscle, lose fat, and change your body composition.

But it happens as a side effect of metabolic health, not as the primary goal.

Focus on the metrics that matter: strength gains, improved endurance, stable energy, better sleep, functional fitness. The aesthetics follow.

Key Science-Based Takeaways

Daily Steps: The Foundation

10,000 steps/day is not required for most health benefits.

The evidence: A study of 16,741 older women5 (mean age 72) found that mortality risk decreased progressively with higher step counts until ~7,500 steps/day, where the curve leveled. Importantly, ~4,400 steps/day was already associated with substantially lower mortality compared to ~2,700 steps/day.

A newer systematic review/meta-analysis6 (57 studies, device-measured steps) found that 7,000 vs 2,000 steps/day was associated with markedly lower risk for all-cause mortality, cardiovascular mortality, type 2 diabetes, dementia, falls.

The inflection point across multiple outcomes was around ~ 7,000-8,000 steps/day.

Practical thresholds:

• Moving from ~2,000-3,000 steps/day toward ~4,000-5,000 steps/day = meaningful risk reductions

• ~7,000-8,000 steps/day is where many curves flatten

• 10,000 steps/day is beneficial if you enjoy it, but not required for most mortality/morbidity benefit

Some days, you just won’t be able to hit your target steps, and it’s OK. Don’t beat yourself about it. Rather than aiming at 7,500 steps a day and losing motivation when you can’t hit them, aim for a weekly average of, say 50,000 steps.

Strength Training: Build Muscle or Lose It

Muscle mass starts declining after 30. This isn’t just about looking strong - it’s about metabolic function and independence.

Why it matters:

• Muscle regulates glucose. More muscle = better insulin sensitivity.

• Muscle protects bones. Strength training increases bone density, especially critical after menopause. The LIFTMOR trial showed that progressive heavy loading with impact can actually reverse bone loss in postmenopausal women.

• Muscle supports joints. Strong muscles take load off vulnerable joints (knees, hips, shoulders).

• Muscle maintains metabolic rate. More muscle tissue means your body burns more energy at rest.

How to do it:

• Compound lifts: Squat, deadlift, chest press, overhead press, rows. These work multiple large muscle groups at once.

• Lift heavy: 6 reps or less per set, with as much weight as you can handle safely. Heavy resistance signals your body to keep (or build) muscle and bone.

• Frequency: 2-3x/week. Full recovery between sessions (48-72 hours).

• Progressive overload: Gradually increase weight, reps, or sets over time. Your body adapts only when challenged.

Critical: Proper bracing is non-negotiable. Lifting without core stability = injury risk.

Moderate Cardio: Aerobic Efficiency

In this kind of activity you’re working, but you can still hold a conversation. Think brisk walking, easy cycling, swimming at a steady pace.

Why it matters:

• Builds mitochondrial density. More mitochondria = better energy production, fat oxidation, and endurance.

• Improves cardiovascular health. Moderate cardio strengthens your heart without overloading your system.

• Supports metabolic flexibility. Your body gets better at using fat for fuel, which stabilizes energy and reduces glucose spikes.

How much you need: 150 minutes/week is the sweet spot.

Heart rate target: ~60-70% of your max heart rate (220 - your age).

Example: 40 years old → (220 - 40) x 0.6 / (220 - 40) × 0.7 = 108 - 126 bpm.

Good news: this will already build towards your step count!

HIIT: Peak Aerobic Capacity + Hormonal Advantages for Women

High-Intensity Interval Training (HIIT) or Sprint Interval Training (SIT) = short bursts of maximum effort followed by rest.

Why it matters, especially for women in perimenopause and menopause:

A women-only systematic review and meta-analysis7 found that HIIT and moderate-to-vigorous continuous training produce similar VO₂max improvements in women. So HIIT’s main advantage isn’t superior cardio gains - it’s time-efficiency and hormonal benefits.

For perimenopausal and postmenopausal women, HIIT provides metabolic stimulus that declining hormones no longer provide. This is why HIIT is particularly valuable for women navigating hormonal changes: it “picks up the slack” for declining estrogen and progesterone.

How to do it:

• 2x/week, 10-15 minutes each

• Example: Tabata protocol - 20 seconds all-out effort, 10 seconds rest, 8 rounds (4 minutes total). Repeat 2-3 times with 1-2 min rest between rounds.

• Exercises: Sprints, cycling, rowing, jump squats, burpees

• Go as hard as you can go during work intervals

Critical: HIIT is strong medicine. 2x/week max. Overdoing it = cortisol spike, burnout, injury. If you’re exhausted and sore all the time, you’re doing too much.

Plyometrics: Bone Remodeling

Plyometrics = jumping exercises. Squat jumps, box jumps, jumping jacks, skipping.

Why it matters:

• Jumping creates impact forces that signal bones to remodel and strengthen. This is especially important for preventing osteoporosis.

• Improves power, reaction time, and balance.

• Boosts mitochondrial function and insulin sensitivity.

The key is that impact creates multidirectional stress on bones, which is more effective than steady-state running.

How much you need:

• 10 minutes, 3x/week

• Examples: Squat jumps, side hops, skipping, tuck jumps, mountain climbers, box jumps

Note: If you have joint issues or low bone density, start with low-impact options (mini trampoline/rebounder) or get medical clearance first. The LIFTMOR researchers specifically caution against unsupervised replication of high-impact programs in women with osteoporosis - supervision and proper progression matter.

Stability & Mobility: Stay Functional, Prevent Falls

Stability = core strength, balance, joint integrity.
Mobility = range of motion, flexibility, fascia health.

Why it matters:

• Falls are a leading cause of injury and loss of independence in older adults. The Cochrane review found that balance/functional training and multicomponent programs show the strongest effect for falls prevention.

• Mobility keeps you functional - bending, reaching, twisting, getting up from the floor.

• Fascia care (foam rolling, stretching) reduces stiffness, improves recovery, and prevents injury.

• Core strength protects joints and helps prevent urinary incontinence (common after menopause).

What to do:

• Core work: Planks, dead bugs, bird dogs, pelvic floor exercises, diaphragmatic breathing

• Balance drills: Single-leg stands, balance board, yoga, Tai Chi

• Fascia rolling: Foam roller or lacrosse balls on hips, lower back, feet - 5-10 min, 2-3x/week

• Mobility flows: Yoga, stretching, hip openers, shoulder mobility drills, “toe yoga”

Time commitment: 10-15 minutes, 2-3x/week

How Little Exercise You Actually Need

You really don’t need that much exercise to reap the most benefits. Let me put this in perspective. The average woman spends8:

• 2.5 hours a day watching TV/Netflix

• 2 hours a day on social media

• 8 hours a day sleeping (if you’re lucky!)

• 2.5 hours a day doing household activities

• 8 hours a day working (if you work)

Even the complete routine with strength 3x/week, Zone 2 cardio, HIIT, plyometrics, and mobility - is about 5 hours per week of structured exercise.

That’s 3% of your week!

I’m not saying delete Instagram or never watch Netflix. I’m saying: you have time. We all have time. It’s just buried under habits we don’t even enjoy that much.

Maybe you’re a visual person, well here’s a graph that shows you how little exercise you need per week (it’s the little red sliver):

I promise, even a busy mum like us can find 3% of their time to invest in their long-time health.

The 80/20: Start Here

This is the bare minimum that gives you most of the benefit. Start here. Build slowly. Consistency beats intensity.

1. Move More: 7,000-10,000 Steps/Day

Start with 7,000-8,000 steps/day (or 50,000 a week) if you’re currently sedentary. Build toward 10,000 steps/day if you can sustain it.

Daily movement improves insulin sensitivity, cardiovascular health, and mental clarity. Break up sitting every hour - stand up and move intentionally for at least 2 minutes.

Why this works: The dose-response data is clear—moving from very low steps (~2,000-3,000/day) to moderate steps (~7,000/day) captures most of the mortality benefit. Every additional 1,000 steps matters, especially from a low baseline.

2. Strength Train 2-3x/Week (30 Minutes Each)

Focus on compound lifts: squat, deadlift, chest press, overhead press, rows. Lift heavy (6 reps or less). Full recovery between sessions (48-72 hours).

Prioritize lower-body patterns (squat/hinge/lunge), pushing, pulling, and loaded carries.

Why this works: research in older women consistently show that 2x/week produces substantial strength and functional improvements. This is the minimum frequency that reliably improves strength when done progressively. Adding a third session can help, but 2x/week is the evidence-based minimum.

Don’t Try to Do Everything at Once

Add one thing at a time:

• Weeks 1-4: Add 7,000-8,000 steps/day

• Weeks 5-8: Add 2x strength training

• Weeks 9-12: Reassess and add more if desired (see “Next Level”)

Consistency beats intensity. Small steps compound over decades.

Common Mistakes

Mistake 1: Exercising for Weight Loss

Exercise for metabolic health, functional fitness, and longevity. Weight loss might happen as a side effect, but it’s not the goal. If you’re chasing weight loss through exercise alone, you’ll burn out.

The research is clear: exercise improves metabolic markers, cardiovascular fitness, and functional capacity independent of weight change. Focus on what your body can do, not what it looks like.

Mistake 2: Cardio-Only Approach

Running won’t save you from sarcopenia. You need to lift. Cardio + strength = long-term health.

After 30, you lose muscle every year unless you actively resist it with progressive strength training. Aerobic exercise is important, but it won’t maintain muscle mass or bone density.

Mistake 3: Skipping Mobility Work

“I don’t have time” is the excuse. Falls and injuries cost more time.

Fascia care and mobility are non-negotiable after 40. Your joints need range of motion, your fascia needs movement, and your balance needs practice. 10 minutes twice a week is enough to maintain capacity.

Mistake 4: Overdoing HIIT

HIIT is strong medicine. 2x/week max for most women. More = cortisol spike, burnout, injury, and diminishing returns.

If you’re exhausted, constantly sore, or your sleep is suffering, you’re doing too much high-intensity work. Scale back.

Mistake 5: Not Bracing Properly

Lifting without core bracing = injury risk, especially as connective tissue changes with hormonal fluctuations.

We’ll cover the 6-step bracing protocol in next week’s Strength Training deep dive. This is foundational for safe, effective lifting.

Mistake 6: Thinking You Need a Gym

You don’t. Bodyweight exercises, dumbbells, resistance bands, and a rebounder cover everything you need.

Later in this series I will show you my second-hand home gym setup and the free YouTube resources I use every week.

The Next Level

For those who’ve nailed the 80/20 (steps + strength 2x/week) and want more.

Once you’ve built the foundation - consistent daily steps and 2x/week strength training for at least 8-12 weeks - you can tackle the comprehensive routine:

Moderate Cardio: 150 min/week

• 5x 30-minute brisk walks or 3x 50-minute sessions

• Heart rate at ~60-70 % max (conversational pace, 220 - your age)

HIIT: 2x/week, 10-15 min each

• Tabata protocol (20 sec on / 10 sec off, 8 rounds)

• For hormonal benefits in perimenopause/menopause

• Time-efficient VO₂ max booster

Plyometrics: 2x/week, 10 min each

• Squat jumps, side hops, skipping, box jumps

• Bone remodeling stimulus

• Can be done on a rebounder for joint-friendly option

Stability/Mobility: 2x/week, 10-15 min

• Foam rolling, yoga, balance drills

• Falls prevention, injury prevention

Resources Coming in This Series

• Strength Training: the 6-step bracing protocol, how to lift heavy safely, the hard truth about muscle loss

• Cardio: Zone 2 + HIIT explained, how to calculate your zones

• Plyometrics, Balance & Mobility: falls prevention, fascia care, functional movement

• Book Club: Next Level by Stacy Sims (THE exercise book for women)

• BTS: My rebounder setup (HIIT + plyometrics + balance in 10 minutes)

• Resources: My second-hand home gym + free YouTube channels I use

Subscribe (free) so you don’t miss it.

Subscribe now

Your Turn

Which of the two 80/20 strategies are you starting with - daily steps or strength training?

Have you been doing cardio-only and skipping strength? What’s holding you back from lifting?

Drop a comment. I read every one.

Thank you!

If you made it this far, congratulations! You now have an understanding of why metabolic health is important and how to tweak your eating habits to get there.

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space and build sustainable health without the overwhelm.

If you’re just joining, welcome!

Swiss Army Mum is a science-based wellness system for busy women. Four pillars - Body, Mind, Glow, Flow.

Not every tool, just the right ones.

Most metabolic health biomarkers aren’t tested until disease appears. By the time your doctor diagnoses prediabetes or metabolic syndrome, insulin resistance has been building for years. But there are blood tests that catch dysfunction early — fasting insulin, HOMA-IR, inflammatory markers — and most doctors don’t order them.

Over the past month, we’ve covered the Fuel pillar in depth: how to stabilize blood sugar, prevent insulin resistance, support your microbiome, and eat for long-term metabolic health. You learned how insulin resistance develops silently, years before fasting glucose looks abnormal.

So the obvious question: What should you actually test? How do you track metabolic health before it becomes a problem?

This post answers that. The biomarkers your doctor isn’t testing (but should be). What low-risk ranges are (versus “normal”). And a look at the Google Sheet I built to track them (it even has colors on it!)

Let’s close the Fuel pillar with a practical tool.

Why Standard Blood Tests Miss Metabolic Dysfunction

Your standard annual physical probably tests:

• Fasting glucose

• Total cholesterol, LDL, HDL

• Triglycerides

• Blood pressure

What’s missing:

• Fasting insulin (the earliest indicator of insulin resistance)

• HOMA-IR (insulin resistance calculation)

• HbA1c (3-month glucose average)

• Triglyceride:HDL ratio (insulin resistance proxy when fasting insulin isn’t available)

• Inflammatory markers (hsCRP, uric acid)

• Liver enzymes (AST, ALT, GGT — fatty liver indicators)

Why this matters:

Standard panels are designed to diagnose disease, not prevent it. The “normal” ranges are population averages - often based on populations with silent conditions. By the time a marker crosses into “abnormal,” you’ve often had dysfunction for years.

The SAM approach:

• Test more comprehensively (annually at minimum, but not too often. lifestyle changes take a while to show in your bloodwork)

• Track trends over time (not just single snapshots)

• Aim for low-risk zones, not just “normal”

What 'Normal' Blood Sugar Really Means (And Why Low-Risk Zones Matter)

Before we dive into the biomarkers, let’s clarify what these terms mean:

“Normal” (Clinical Range): The range used by labs and doctors to diagnose disease. Often based on population averages that may include people with subclinical dysfunction. These are the thresholds that trigger a diagnosis or prescription. You want to stay away from this.

“Low-Risk Zone”: The range associated with lowest risk in population studies. This is where I focus — not just avoiding disease, but aiming for long-term metabolic health.

When I say “low-risk zone” or “optimization target,” I’m referencing research showing where risk is lowest — not an official medical guideline. This distinction matters.

Also important: some markers have ethnicity-specific thresholds (like waist circumference), and some vary by sex (like liver enzymes). The tables below reflect this where relevant.

The Essential Biomarkers

One note on sources: the biomarker list in this post was partly inspired by Casey Means' Good Energy. I reviewed the book in my metabolic health reading list. I had real misgivings about its tone and some of its recommendations. But the biomarker framework she presents is genuinely useful and actionable, and it's grounded in solid underlying science. I cross-referenced every marker against primary research and clinical guidelines before including it here. That's the SAM approach: take what works, leave what doesn't.

I’m breaking this into two tiers:

Tier 1: Basic metabolic panel — essential, test annually
Tier 2: Advanced panel — highly recommended if accessible

Essential Metabolic Health Tests (Tier 1)

1. Fasting Glucose

Why it matters: Blood sugar after an overnight fast. It’s a lagging indicator — by the time it’s abnormal, you’ve had dysfunction for years. But even within the “normal” range, higher fasting glucose predicts diabetes risk.

Normal: <100 mg/dL (5.6 mmol/L)
Low-risk zone: 70-85 mg/dL (3.9-4.7 mmol/L)

Clinical data1: A study of over 46,000 people found that those with fasting glucose 95-99 mg/dL had significantly higher diabetes risk than those <85 mg/dL — despite both being “normal. The low end (70 mg/dL) is a standard clinical lower bound.

2. Hemoglobin A1c (HbA1c)

Why it matters:
Measures your 3-month average blood sugar by looking at the percentage of hemoglobin with sugar attached via glycation. More stable than fasting glucose and captures trends, not just snapshots.

Normal: <5.7%
Low-risk zone: 5.0-5.4%

Clinical data: The ARIC study (over 11,000 participants) used 5.0-5.4% as the reference category for heart failure risk, with risk increasing in categories above 5.5%2. Other large cohorts show similar patterns3. This isn’t an official target — it’s the category consistently associated with lowest risk in research.

3. Triglycerides

Why it matters: Triglycerides are fats carried in the bloodstream, largely packaged by the liver. When you eat more sugar and carbs than your liver can handle — especially fructose — the excess gets converted to fat and packaged as triglycerides. Elevated fasting triglycerides are therefore a well-established marker of metabolic dysfunction and are strongly associated with insulin resistance, metabolic syndrome, and non-alcoholic fatty liver disease.

Normal: <150 mg/dL (1.7 mmol/L)
Low-risk zone: Well below 100 mg/dL; <80 mg/dL often seen in very insulin-sensitive profiles

Clinical data : The clinical threshold (<150 mg/dL) is well-established. But research suggests that triglycerides in the “normal-high” range (100-150 mg/dL)4 may already be associated with inflammation and increased coronary risk.

4. HDL Cholesterol

Why it matters:
The “good” cholesterol that helps remove cholesterol from your bloodstream and carries it back to the liver for processing. Low HDL correlates with insulin resistance. The real signal is the pattern: low HDL + high triglycerides = atherogenic dyslipidemia, a hallmark of metabolic dysfunction.

Normal: Women >50 mg/dL (1.3 mmol/L), Men >40 mg/dL (1.0 mmol/L)
Desirable: ≥60 mg/dL (1.5 mmol/L)

How to interpret: Low HDL is clearly unfavorable. Higher HDL (≥60 mg/dL) has historically been considered protective, though recent studies show a U-shaped relationship in some populations — very high HDL isn’t always better5. Most useful when viewed alongside triglycerides (see next marker).

5. Triglyceride:HDL Ratio

Why it matters:
A simple calculation (triglycerides ÷ HDL, using mg/dL or mmol/L for both) that serves as an insulin resistance proxy when you don’t have access to fasting insulin testing. Studies show this ratio correlates well with underlying insulin resistance and can reveal dysfunction even when individual markers look “normal.”

Low-risk zone: <1.5 (lower is better)
Concerning: >3 strongly suggests insulin resistance

Clinical data: A ratio ≥3 identifies insulin-resistant individuals fairly well in many populations. Critical: if you’re using mmol/L instead of mg/dL, the numerical ratio will be different — you need to convert units6. A ratio >3 in mg/dL units corresponds to approximately >1.8 in mmol/L units.

6. Blood Pressure

Why it matters:
Measures the force of blood against your artery walls. High blood pressure is the most common preventable risk factor for cardiovascular disease, stroke, heart failure, kidney disease, and dementia. Chronic hyperinsulinemia raises blood pressure because insulin causes sodium retention.

Normal: <120/<80 mmHg

Clinical data: European guidelines define “optimal” as <120/<80 explicitly7 as optimal. A massive meta-analysis showed that cardiovascular risk increases continuously without an obvious threshold, at least down to 115/75 mmHg. Interpret with context: age, symptoms, pregnancy, medications.

7. Waist Circumference

Why it matters:
Proxy for abdominal fat, specifically visceral fat stored around your organs. Unlike subcutaneous fat (under the skin), visceral fat is metabolically active — it drives insulin resistance, inflammation, and metabolic dysfunction. Central adiposity predicts metabolic disease even when BMI is “normal.”

Normal (ATP III, often US): Women <88 cm (35 in), Men <102 cm (40 in)

Ethnicity-specific thresholds (International Diabetes Federation, IDF): European, Sub-Saharan African, Middle Eastern, Eastern Mediterranean: Women <80 cm (31.5 in), Men <94 cm (37 in)

How to interpret:
These aren’t “optimal” targets — they’re risk thresholds. The IDF cutoffs recognize that risk varies by ancestry and are widely used internationally8.

Advanced Insulin Resistance Tests (Tier 2)

8. Fasting Insulin

Why it matters:
THE earliest indicator of insulin resistance. Measures how much insulin your pancreas is pumping out after an overnight fast. Insulin rises years before glucose does — this is the marker that catches dysfunction earliest, often a decade before your doctor says “prediabetes.”

Normal: <25 mIU/L (varies by lab and population)
Low-risk zone: 2-5 mIU/L

Clinical data: There’s no universal consensus on cut-offs because methods vary, but patterns emerge: An NHANES analysis defined “hyperinsulinemia” as >10 µU/mL9; The 2-5 mIU/L range represents very insulin-sensitive profiles — it’s an optimization target, not a clinical guideline.

9. HOMA-IR (Homeostatic Model Assessment of Insulin Resistance)

Why it matters:
A calculation that combines fasting glucose and fasting insulin to quantify insulin resistance. More informative than either marker alone. Think of it as a snapshot of how hard your pancreas is working to keep glucose “normal” — high HOMA-IR means your body needs lots of insulin to manage blood sugar.

Formula: Formula: (Fasting Glucose in mg/dL × Fasting Insulin in mIU/L) ÷ 405 OR (Fasting Glucose in mmol/L × Fasting Insulin in mIU/L) ÷ 22.5

Low-risk zone: <1.0
Normal: <2.0
Insulin resistant: >2.5
Severely insulin resistant: >5.0

Clinical data: Cut-offs vary widely by population, age, sex, and ethnicity. The original HOMA paper notes day-to-day variability, reinforcing the value of tracking trends10. Bottom line: <2.0 is broadly consistent with “normal”; <1.0 represents very insulin-sensitive profiles.

10. High-Sensitivity CRP (hsCRP)

Why it matters:
Measures C-reactive protein, an inflammation marker made by your liver. Chronic low-grade inflammation drives metabolic dysfunction, cardiovascular disease, and accelerates aging (”inflammaging”). High hsCRP indicates your body is in a persistent inflammatory state, which damages tissues and worsens insulin resistance over time.

Risk categories (AHA/CDC):

• Low risk: <1.0 mg/L

• Average risk: 1.0-3.0 mg/L

• High risk: >3.0 mg/L , higher suggests acute inflammation

11. Uric Acid

Why it matters:
A metabolic byproduct of fructose metabolism and purine breakdown (from meat and alcohol). Elevated uric acid is associated with metabolic dysfunction, gout, hypertension, and cardiovascular disease. It’s both a marker of metabolic stress and potentially a contributor to it - high levels can damage blood vessels and worsen insulin resistance.

Normal: Women 1.5-6.0 mg/dL, Men 2.5-7.0 mg/dL
Low-risk zone (optimization target): Women 2.0-4.0 mg/dL, Men 3.0-5.5 mg/dL

How to interpret:
Serum becomes saturated in urate around 6.8 mg/dL, favoring crystallization (gout)11. But risk increases gradually even within “normal” ranges. A large cohort found that hypertension risk increases with uric acid starting as low as 4 mg/dL in some subgroups12. Caveat: Causality is debated — uric acid may be a marker rather than a cause.

12. Liver Enzymes: AST, ALT, GGT

Why they matter:
Proteins released when liver cells are damaged or inflamed. Elevated enzymes suggest fatty liver (NAFLD), the most common chronic liver disease and a hallmark of metabolic dysfunction. They catch liver stress before clinical disease appears.

Normal (typical lab ranges):

• ALT: 7-55 U/L

• AST: 8-48 U/L

• GGT: 6-61 U/L

Low-risk zone (proposed “healthy normal”):

• ALT: Women ~19-25 U/L, Men ~29-33 U/L

• AST: Similar to ALT

• GGT: Women <20 U/L, Men <25 U/L

How to interpret:
Standard lab upper limits have been criticized because they include people with silent liver disease. A landmark study proposed lower upper limits for ALT (~30 men, ~19 women) in truly healthy populations13.

How to Read Your Metabolic Health Results

Metabolic dysfunction doesn’t happen overnight. It develops slowly, over years or even decades. The point of tracking these biomarkers isn’t to obsess over every tenth of a point or panic when one number isn’t perfect.

The goal is awareness and trends.

• One abnormal result doesn’t mean disaster. Biomarkers fluctuate based on hydration, stress, sleep quality, recent meals (even when fasting), menstrual cycle, and more. Single data points can be noisy.

• Trends matter more than snapshots. Test annually. Are your markers moving in the right direction or stable? That’s what counts.

• Lab ranges vary. Different laboratories use different methods and reference populations. What’s “normal” at one lab may differ slightly at another - especially for insulin and liver enzymes.

• Individual variation is real. Age, sex, ethnicity, genetics, and activity level all affect what’s “normal” for you. The ranges below are population-based guidelines, not hard rules.

• Use this as a tool, not a source of anxiety. The tracker makes the invisible visible so you can see whether the Fuel principles (and Sleep, Exercise) are working. It’s feedback, not judgment.

If results are concerning or you’re unsure how to interpret them, work with a healthcare professional. This is educational information, not medical advice.

Why Tracking Your Own Biomarkers Empowers Better Health Decisions

Here’s what changed for me when I started tracking these markers: I stopped being a passive patient.

For years, I’d go to my annual physical, get a printout with numbers I didn’t fully understand, and my doctor would say “everything looks normal” or “your cholesterol is a bit high, let’s recheck in six months.” I’d leave with vague anxiety and no clear action plan.

Now? I understand what the numbers mean. I know which markers predict future problems years before diagnosis. I can ask specific questions.

This isn’t about replacing my doctor. It’s about being an informed partner in my own health. That’s empowering.

My doctor is the expert. She has medical training, clinical experience, and context I don’t have. She can interpret results in light of my full health history, prescribe medication when needed, and catch things I’d miss.

But I am the expert on my body and my daily choices. I’m the one implementing the Fuel principles. I’m the one tracking sleep, managing stress, exercising consistently. I’m the one who sees patterns the lab can’t capture.

When I bring data, not just one test result, but trends over time, my doctor and I can have deeper, more productive conversations. We can make decisions together based on evidence, not guesswork.

The goal isn’t perfection. It’s agency.

The Metabolic Health Tracker (Google Sheets Template)

That's why I built this tracker - not to replace medical expertise, but to make myself a better partner in my own health. I wanted to see patterns, not just single snapshots. I wanted to know if the Fuel, Sleep and Exercise principles were actually working. I wanted a visual reference I could return to annually.

What’s included in the tracker:

• All biomarkers listed above

• Date tracking (annual testing with trend visualization)

• Automatic color-coding (green = low-risk zone, yellow = normal but not optimal, red = out of range)

• HOMA-IR auto-calculation (input fasting glucose + insulin → calculates HOMA-IR)

• Triglyceride:HDL ratio auto-calculation

• Two sheets for SI and US units

How it works:

1. Input test date + values

2. Sheet auto-calculates HOMA-IR and TG:HDL ratio

3. Cells color-code based on low-risk/normal/out-of-range

Note: This tracker will be available to paid subscribers when I launch the Swiss Army Mum Toolkit later this year. For now, I’m showing you what it looks like and why it works. But you can also make one yourself! This is the made-for-you option.

My results

When I look at this tracker, I don’t see numbers. I see patterns.

Green dominates. That means my metabolic system isn’t quietly deteriorating. The markers that predict dysfunction years in advance - fasting insulin, HOMA-IR, triglyceride:HDL ratio - aren’t creeping into yellow or red. They’re stable in the low-risk zone.

Blood sugar control is holding. Fasting glucose and HbA1c haven’t drifted upward over time. No slow escalation. No quiet progression toward prediabetes. The system that regulates glucose isn’t under chronic stress.

Lipids are coordinated. Triglycerides and HDL are behaving like they belong in the same metabolic system - which they do. When those two move together in the right direction, it usually reflects how efficiently your liver handles fuel over the long term. Not one meal. Not one week. The trend.

The insulin markers matter most to me. Fasting glucose can stay “normal” for years while insulin quietly climbs in the background, compensating. I only have one measurement of fasting insulin. I’ll make sure to get another one at my next physical.

Blood pressure is stable. No progressive tightening. No upward creep. A cardiovascular system that doesn’t look chronically irritated.

There’s one red cell. Inflammation spiked once. And I have context for that - I was recovering from an acute illness when I tested. Inflammatory markers are supposed to respond to acute stress. What would concern me is persistent elevation across multiple time points without explanation, which is not what I see. I wish I had tested hRCP on a different occasion, will make sure to add that one too next time.

Liver enzymes fluctuate slightly between tests. That’s normal biology. Training intensity, illness, stress, even a disrupted week can move them. What matters is trajectory - are they climbing progressively over time? No. Just normal variation within a stable range.

That’s the theme across this tracker: stability, not perfection.

No silent deterioration. No quiet metabolic unraveling.

I still have pizza nights. I still have dessert. I still live like a human. But I don’t graze all day. I prioritize protein and fiber. I lift weights. I walk after meals. I sleep like my life depends on it. And when I zoom out across years of data, the patterns reflect that.

The Fuel principles aren’t about perfect labs. They’re about a metabolism that doesn’t quietly break down over time.

What the Tracker Can’t Tell You (Limitations)

This Isn’t a Substitute for Medical Care

If results are abnormal, work with a doctor.

Don’t diagnose yourself or self-treat based on spreadsheet colors.

Some conditions require medication (e.g., very high BP, diabetes) — lifestyle isn’t always enough.

Individual Variation Exists

Low-risk zones are population-based guidelines, not hard rules.

Genetics, ancestry, age, sex, activity level all affect what’s “normal” for you.

Use the tracker as a guide, not gospel.

Single Tests Can Be Noisy

Hydration, stress, sleep quality, recent meals (even if fasting), menstrual cycle — all affect results.

One abnormal result doesn’t mean panic.

Trends matter more than single data points.

What’s Next

We’ve now covered Sleep and Fuel in depth — 2 out of 3 Body sub-pillars.

Next: Exercise: muscle as the longevity organ, the 80/20 workout routine, and why strength training matters more than you think.

See you February 25.

Subscribe (free) so you don’t miss Exercise!

Subscribe now

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share

See you next week.

— Mica

Your Turn

Have you had comprehensive metabolic testing done? What surprised you?

Which biomarker are you most interested in tracking?

If you’ve been following the Fuel principles, have you retested to see if they’re working?

Comment below — I read every one.

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. Work with a qualified healthcare professional.

Last week, I published the insulin resistance deep dive - how insulin resistance develops, why your body responds differently than mine, and what two weeks of glucose data taught me about my metabolism.

This week: gut health.

Not because it’s trendy. Because your microbiome is a metabolic organ that directly affects insulin sensitivity, inflammation, mood, and disease risk. And because fermented foods - kombucha, kefir, kimchi, sauerkraut - are a great way to support it.

This is a Zoom post: the mechanism behind why gut health matters, the science on fermented foods, and the behind-the-scenes on why I’ve been brewing kombucha for years.

No miracle claims. No detox nonsense. Just curiosity, context, and a bit of fun.

The Drink on My Counter

Right now, there are three glass jars on my kitchen counter.

One is actively fermenting - a thick, gelatinous disc floating on top of sweet tea that’s slowly turning acidic. One is in second ferment with frozen berries, building carbonation. One is in the fridge, ready to drink.

I’ve been brewing kombucha for years. Not because it’s a superfood. Not because I’m trying to optimize every variable of my health.

I brew it because it’s a wholesome activity that brings me joy. It’s creative. It’s satisfying to make something from scratch. My family loves trying new flavors - my kids gave me 10/10 on the first blackberry-mint brew.

And honestly? It fits perfectly into Nassim Taleb’s suggestion: only consume drinks that are at least 1,000 years old.

Water. Tea. Coffee. Wine. Kombucha.

Kombucha has been around for over two millennia. Personally, I find it’s amazing that we can still make something that’s been around for such a long time. The fact that we’re still drinking things that people were making 2,000 years ago tells me there is something special about it and that it will probably stick around for another 2,000 (unlike the latest bright blue ultra-sweet bubbly monster you can find in the supermarket).

But here’s another bonus of being curious and wanting to know the workings behind what you’re doing. The science on gut health and fermented foods is fascinating. Your microbiome isn’t just “gut bacteria.” It’s a metabolic organ that influences insulin sensitivity, inflammation, nutrient absorption, and even mood regulation through the gut-brain axis.

Kombucha won’t fix a terrible diet. But as part of the Fuel framework - whole foods, stable glucose, adequate protein, fat and fiber - it’s a low-effort addition that supports the metabolic allies you’re already feeding.

Keep reading for the mechanism behind why your microbiome matters. What fermented foods actually do. Why kombucha fits my life - not as medicine, but as one of those 1,000-year-old drinks that aligns with metabolic health and brings me joy.

Let’s start with the history. Because understanding where kombucha came from helps frame what it actually is - and what it isn’t.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The 2,000-Year-Old Story

Kombucha didn’t start as a bottled functional beverage in Whole Foods. It started as a local fermented tea in northeast China over 2,000 years ago.

Most academic reviews trace kombucha’s origins to the region historically known as Manchuria or the Bohai Sea area. The earliest references date back to around 220 BCE, based on historical food records and scholarly interpretations of fermented tea drinks in early Chinese texts12. Around 414 AD, the beverage was introduced to Japan by a Korean physician named Kombu, who reportedly used it to treat intestinal disorders in the Japanese emperor. The drink later became known as kombucha in his honor. From Asia, kombucha spread westward via commercial routes. Historical sources suggest it first reached Russia, before expanding to Germany and Italy in the early 20th century, shortly after World War II. By the 1950s, kombucha had also gained popularity in France and North Africa3.

Here’s the key: fermented foods predate written records. Humans have been fermenting milk, vegetables, grains, and tea for millennia because fermentation made food safer, tastier, and more nutritious. No one “invented” kombucha in the way you’d invent a new technology. It emerged from tea culture and fermentation practices that were already widespread.

The drink spread gradually through Eurasian trade routes. By the 19th and early 20th centuries, kombucha had reached Russia and Eastern Europe. Scientific and industrial interest picked up mid-20th century.

The exact timeline is murky - but the pattern is clear. Fermented foods persist across cultures and centuries because they deliver real benefits. Kombucha is ancient because it works.

Now let’s talk about why.

Your Gut Microbiome Is a Metabolic Organ

I introduced the microbiome briefly in the Fuel blueprint post. Here’s the deeper dive.

Your gut contains trillions of bacteria, fungi, and other microorganisms. This isn’t a passive collection of hitchhikers - it’s an active metabolic organ that influences insulin sensitivity, inflammation, nutrient absorption, appetite regulation, and mood4.

Think of your microbiome as a second metabolic system running in parallel with your own cells.

What Beneficial Bacteria Do

They ferment fiber into short-chain fatty acids (SCFAs) - specifically butyrate, propionate, and acetate. These SCFAs are metabolic powerhouses:

• Improve insulin sensitivity

• Reduce systemic inflammation

• Strengthen the gut barrier (preventing “leaky gut”)

• Provide energy to colon cells

• Regulate appetite hormones (ghrelin, leptin)

They synthesize vitamins (K, B12) that your body can’t produce on its own.

They modulate your immune system - about 70% of immune cells live in your gut.

What Harmful Bacteria Do

Fed by ultra-processed foods, refined sugars, and artificial sweeteners, harmful bacteria:

• Weaken the gut barrier, allowing bacterial fragments to leak into the bloodstream and trigger inflammation

• Produce inflammatory metabolites (lipopolysaccharides, trimethylamine N-oxide)

• Worsen insulin resistance

• Disrupt appetite signaling

The composition of your microbiome predicts metabolic health independently of diet quality. Two people can eat the same diet and have wildly different metabolic outcomes based on their gut bacteria5.

A disrupted microbiome is linked to: obesity, type 2 diabetes, cardiovascular disease, neurodegeneration (Alzheimer’s), mood disorders (depression, anxiety), autoimmune conditions.

The good news? You can reshape your microbiome relatively quickly - weeks to months - through diet and lifestyle changes6.

The stakes are clear: your gut bacteria aren’t a side story. They’re central to metabolism, inflammation, and long-term health.

How to Support Your Microbiome (The Fundamentals)

Before we talk about kombucha or any fermented food, let’s establish the foundation.

These are the fundamentals - not optional, not advanced. If you’re not doing these consistently, kombucha or any other fermented food won’t save you.

Eat Fiber (Prebiotics)

Fiber is food for beneficial bacteria. Without it, they starve.

Sources: vegetables, legumes, whole fruits, whole grains Target: 25-50g per day (start where you are and increase gradually)

This is Principle 4 from the Fuel blueprint. Non-negotiable.

Avoid Ultra-Processed Foods

Ultra-processed foods are stripped of fiber and micronutrients. They starve beneficial bacteria and feed harmful ones.

This is Principles 1 & 2 from the Fuel blueprint. Also non-negotiable.

Eat Fermented Foods (Optional But Beneficial)

Fermented foods deliver live probiotics (beneficial bacteria) plus the metabolites they produce during fermentation.

Examples: yogurt, kefir, sauerkraut, kimchi, miso, tempeh, kombucha

Not enough on their own, but beneficial.

Minimize Antibiotics When Possible

Antibiotics are necessary for bacterial infections - use them when needed and as directed. They do wipe out beneficial bacteria along with harmful ones.

If you take antibiotics, rebuild your microbiome afterward with fiber and fermented foods.

Key takeaway

Fiber-rich whole foods are step one. Kombucha is NOT step one.

Fermented foods are a bonus - they add diversity and deliver probiotics, but they can’t compensate for a poor foundation.

If you’re eating ultra-processed foods, drinking kombucha won’t fix your microbiome. But if you’re already eating whole foods and adequate fiber, fermented foods amplify the benefits.

Fermented Foods and Gut Health: What the Science Says

Fermentation is ancient food preservation. Before refrigeration, humans fermented milk, vegetables, grains, and tea to make them last longer, taste better, and become more digestible.

What fermentation does

• Preserves food (survival strategy before refrigeration)

• Produces beneficial metabolites (organic acids, B vitamins, enzymes)

• Delivers live probiotics (beneficial bacteria and yeast)

Different fermented foods = different bacteria

This matters. Different fermented foods deliver different strains of bacteria: Variety builds a more resilient microbiome. I eat multiple fermented foods - kefir, kimchi, sourdough, kombucha - not because one is magic, but because diversity matters.

Multiple studies show that fermented foods increase microbiome diversity - a key marker of metabolic health. A 2021 Stanford study found that a diet high in fermented foods increased microbiome diversity and reduced markers of inflammation more effectively than a high-fiber diet alone78.

What is Kombucha?

Kombucha is fermented tea. That means it starts with tea (black, green, or oolong from Camellia sinensis) and sugar, then gets transformed by a SCOBY - a symbiotic culture of bacteria and yeast.

The SCOBY is what makes kombucha work. It’s a gelatinous film dominated by acetic acid bacteria (like Acetobacterand Gluconobacter) plus various yeasts. During fermentation, yeasts produce ethanol from sugar. Acetic bacteria then convert that ethanol into acetic acid - which gives kombucha its characteristic tangy flavor.

The fermentation process takes several weeks, depending on temperature and how acidic you want the final product. The longer it ferments, the more acidic it becomes.

It is usually followed by a second, shorter fermentation, done in air tight bottles, meant to carbonate the drink and flavor it with various fruits and spices.

What’s Actually in Kombucha

The chemical composition of kombucha is more complex than you’d think - and it varies based on tea type, sugar amount, fermentation time, and temperature.

Organic acids: The acidity comes from multiple organic acids produced during fermentation:

• Acetic acid (predominant - this is vinegar)

• Gluconic acid

• Glucuronic acid

• Citric, malic, tartaric, and lactic acids

These acids aren’t just flavor - they contribute to kombucha’s antimicrobial properties and may support liver detoxification pathways.

Polyphenols (from tea): Kombucha inherits the polyphenols from tea - especially flavonoids like catechins and their derivatives. These are antioxidant compounds that reduce oxidative stress and inflammation.

Other compounds:

• Trace ethanol: Typically <0.5% alcohol (below legal threshold for “alcoholic beverage”), though homebrewed kombucha can have slightly higher levels

• Residual sugars: Mostly glucose and fructose, plus some unfermented sucrose. A properly fermented kombucha has low sugar content - most of it gets consumed during fermentation.

• Vitamins: B-complex vitamins (B1, B2, B6, B12) and vitamin C

• Minerals: Iron, zinc, manganese (from tea leaves)

• Amino acids: From tea and yeast metabolism

• Live probiotics: Both bacteria and yeast remain viable in the final beverage

What the Research Shows (and Doesn’t)

Most kombucha research involves in vitro (cell culture) or animal studies. Human clinical trials are limited. That matters - what works in a petri dish or in mice doesn’t always translate to humans.

Let’s be clear about what kombucha is not:

Not a cure-all. It won’t reverse type 2 diabetes, fix a terrible diet, or replace medication.

Not a detox miracle. Your liver and kidneys handle detoxification. kombucha doesn’t “cleanse” you of toxins - that’s marketing nonsense.

Not well-studied in humans. Most evidence comes from cell cultures and animal models. We need large, well-designed clinical trials to confirm health benefits in humans.

Highly variable quality. Commercial kombucha brands vary in sugar content, live bacteria count, fermentation quality, and polyphenol concentration. Some are glorified sweet tea with minimal functional benefit.

My Take

Kombucha has plausible mechanisms for supporting gut health and metabolism:

• Organic acids may modulate gut pH and suppress harmful bacteria

• Polyphenols reduce oxidative stress and inflammation

• Live probiotics (if present in sufficient quantities) add microbiome diversity

• Low sugar content (if fermented properly) aligns with metabolic health

But it’s not magic. It’s a functional beverage with moderate evidence supporting antioxidant and anti-inflammatory effects - mostly from animal studies and lab tests.

If you’re doing the Fuel fundamentals (whole foods, fiber, protein, stable glucose, cut sugars and processed grains), kombucha is a reasonable addition. It supports the gut bacteria you’re already feeding. And if you brew it yourself, you control the sugar and fermentation. However, if you’re not doing the fundamentals, kombucha won’t save you.

Why I Brew Kombucha

You may be wondering, if I don’t sell kombucha as a miracle cure, then why write so much about it?

I brew kombucha also as part of my Mind and Flow pillar practices: mind because is what I call a “wholesome activity” that makes me happy, and flow because it’s a system that virtually runs on autopilot and doesn’t require willpower (plus it costs a fraction of what commercial kombucha costs!). Once you set it up, it’s 30 minutes of active work every 2-3 weeks. The rest is passive fermentation.

I don’t drink much alcohol anymore. But I like having something interesting to sip on movie nights or when hosting friends. Kombucha fits. It’s fizzy, flavorful, and aligns with metabolic health. It is basically aligned with my values: simple, sustainable, evidence-backed.

We have a few staple flavors, but my daughter loves coming up with new combinations. The usual rotation: lemon-ginger, raspberry-rosemary, blueberry-mint.

How about you? Do you brew kombucha? Do you drink it?

Should you brew Kombucha?

I brew kombucha because I’m a nerd who ferments everything. You don’t have to.

The goal isn’t perfection - it’s finding sustainable practices that bring you joy and align with metabolic health.

If buying good commercial kombucha fits your life better than brewing, do that. If you’re not interested in kombucha at all but you eat sauerkraut and yogurt regularly, you’re fine! Variety matters more than any single food.

Kombucha is a low-effort, evidence-backed addition that supports the gut bacteria you’re already feeding through whole foods.

And for me, it’s also just fun!

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share

Your Turn

Do you brew kombucha? Drink it? What fermented foods are part of your routine?

Have you noticed any changes in digestion, energy, or mood from adding fermented foods?

Comment below - I read every one.

Medical note: This is educational, not personal medical advice. Your biology, history, and context matter. For significant changes, work with a qualified healthcare professional.

References

Last week, I published the Fuel blueprint - the 80/20 of eating for metabolic health: stabilizing blood sugar, preventing insulin resistance, prioritizing whole foods, and letting insulin do what it’s designed to do.

This post is not a continuation of that blueprint.

This is a Zoom post: the story underneath it.

No protocols. No hacks. No food rules.

Just mechanism, context, and a better way to think about metabolism.

You Can Have Normal Glucose and Still Be Metabolically Broken

For decades, metabolic health has been treated as something you can assess with a single number.

If fasting glucose is “normal,” you’re fine.
If it isn’t, you’re not.

That framing is comforting - and deeply misleading.

Fasting glucose is measured at the most forgiving moment possible: after an overnight fast, when insulin has already had hours to quietly clean up the system. It tells you almost nothing about how metabolism behaves the rest of the day — after meals, under stress, with imperfect sleep, in real life.

You can have completely normal fasting glucose and still be metabolically dysfunctional.

Fasting glucose is a lagging indicator. By the time it becomes abnormal (crosses 100 mg/dL), you’ve likely had insulin resistance for a decade. The damage starts much earlier - when your body is pumping out excess insulin to keep glucose “normal.”

And your doctor usually won’t tell you to do anything until a guideline value prompts a prescription drug - for life.

This post is about that story.

• How insulin resistance actually develops.

• Why fructose plays a disproportionate role.

• Why identical foods produce radically different responses.

• And what my CGM data taught me about my own metabolism.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The Insulin Mechanism: How Metabolic Dysfunction Actually Develops

What Insulin Does

Insulin is a storage hormone. When you eat, your blood glucose rises. Your pancreas releases insulin to shuttle that glucose into cells (muscle, liver, fat) where it can be used for energy or stored for later.

In a healthy metabolism, this works beautifully. Glucose goes up, insulin goes up, glucose gets cleared from the bloodstream, insulin drops back down.

Clean, efficient, no problems.

But when you eat foods that spike glucose repeatedly - refined carbohydrates, added sugars, especially liquid sugar - your cells get flooded with fuel over and over.

Eventually, they stop responding to insulin’s signals.

This is insulin resistance.

The Progression: From Healthy to Dysfunctional

Here’s how it unfolds, often over decades:

Stage 1: Normal metabolism

• You eat, glucose rises, insulin rises, glucose clears, insulin drops

• Cells respond properly to insulin signals

• Everything works as designed (being young has its perks!)

Stage 2: Early insulin resistance (silent phase)

• You eat, glucose rises, but cells don’t respond as well to insulin

• Pancreas compensates by producing MORE insulin to get the same glucose-clearing effect

• Fasting glucose still looks normal (because the extra insulin is doing its job)

• But you now have hyperinsulinemia - chronically elevated insulin levels

This stage can last years. You feel fine. Your doctor says your glucose is normal. But insulin is quietly doing damage: promoting fat storage, raising your body-weight set-point, triggering inflammation.

Stage 3: Advanced insulin resistance

• Cells are significantly insulin resistant

• Pancreas pumps out even more insulin, but it’s not enough anymore

• Post-meal glucose stays elevated longer (you’d see this on a CGM, but not on a fasting test)

Stage 4: Prediabetes/Type 2 Diabetes

• Pancreas can’t keep up anymore

• Fasting glucose finally crosses 100 mg/dL (prediabetes) or 130 mg/dL (diabetes)

• Now it shows up on standard tests - but the damage has been accumulating for decades

The critical insight from Jason Fung’s The Obesity Code: By the time your fasting glucose is abnormal, you’re already deep into metabolic dysfunction. Insulin resistance starts long before glucose becomes a problem.

Why Insulin Matters More Than Glucose

Glucose is the symptom. Insulin is the cause.

When insulin is chronically elevated:

• Fat storage increases. Insulin signals your body to store energy as fat and blocks fat breakdown (lipolysis). You literally cannot access stored fat for energy when insulin is high.

• Your set-point rises. Your body defends a higher weight because insulin has recalibrated what it considers “normal.”

• Cells starve despite abundance. Insulin-resistant cells can’t take in glucose properly, so they’re energy-deprived even though your bloodstream is full of fuel. Meanwhile, excess glucose gets shunted into fat storage.

• Inflammation increases. Hyperinsulinemia triggers inflammatory pathways, worsening the feedback loop.

This is why calorie restriction often fails for weight loss. If insulin is high, your body stays in fat-storage mode no matter how little you eat. You can’t out-starve a hormonal problem.

Casey Means’ perspective from Good Energy: Chronic hyperinsulinemia also damages mitochondria - your cellular powerhouses. Damaged mitochondria produce less ATP (energy) and more free radicals (oxidative stress), which further drives inflammation and insulin resistance. It’s a vicious cycle: insulin resistance → mitochondrial damage → more oxidative stress → worsening insulin resistance.

The Two-Compartment Model

Think of your body as having two compartments:

1. Bloodstream (where glucose circulates)

2. Cells (where glucose should go for energy)

In a healthy metabolism, glucose moves easily from bloodstream to cells. Insulin opens the door.

In insulin resistance, the door is stuck. Glucose piles up in the bloodstream (eventually leading to high blood sugar), but cells are starving. Your body’s solution? Store the excess glucose as fat.

This is why people with insulin resistance often feel tired despite eating plenty. Their cells aren’t getting fuel efficiently.

Swiss Army Mum angle

This insulin-driven fat storage mechanism is why Principle 2 from the Fuel blueprint (cut added sugars and refined grains) matters so much. Refined carbs and sugars spike glucose repeatedly, forcing your pancreas to pump out insulin over and over. Eventually, you develop insulin resistance. And why Principle 5 (space your meals and fast overnight) is critical - constant grazing keeps insulin chronically elevated, never giving your body a chance to drop into fat-burning mode.

Fung's work taught me that metabolic health isn't about willpower or calorie restriction. It's about managing the hormonal signals that control fat storage.

Fructose: The Hidden Villain

If insulin resistance is the fire, fructose is the gasoline.

How Fructose Differs from Glucose

Glucose and fructose are both sugars, but they’re metabolized very differently.

Glucose:

• Enters bloodstream → triggers insulin release → shuttled into cells (muscle, liver, fat) for energy or storage

• Every cell in your body can use glucose

• Regulated by insulin

Fructose:

• Bypasses normal glucose regulation entirely

• Goes straight to the liver (the only organ that can metabolize it in significant amounts)

• Rapidly converted to liver fat through a process called de novo lipogenesis1 (literally “making new fat”)

• Does NOT trigger insulin release (which sounds good but isn’t - it means fructose sneaks past your body’s regulatory mechanisms)

Why Liquid Sugar Is Worse

When you eat an apple, you get fructose + fiber. The fiber slows absorption, feeds your gut bacteria, and moderates the glucose/insulin response. Your liver can handle the fructose load from one apple.

When you drink a glass of orange juice, you get the fructose of 4-5 oranges with ZERO fiber. Your liver gets slammed with fructose all at once. It converts the excess to fat and stores it directly in the liver - hello, non-alcoholic fatty liver disease (NAFLD).

Your liver doesn’t distinguish between fresh-pressed juice and a can of Coke. Both deliver a fructose bomb without fiber.

From Jason Fung’s The Obesity Code: Liquid sugar - soda, juice, sweetened lattes, energy drinks - is the single fastest route to insulin resistance and fatty liver. The combination of glucose (spikes insulin) and fructose (creates liver fat) is metabolically catastrophic.

The “Fruit Is Fine, Juice Is Not” Rule

Whole fruit: fiber buffer + micronutrients + polyphenols = moderate, manageable fructose load

Fruit juice: fructose bomb + no fiber = metabolic disaster

Dried fruit: concentrated fructose + no water content = easy to overeat, blood sugar spike

If you’re going to eat fruit (and you should!), eat it whole. Skip the juice.

Swiss Army Mum angle

This is why liquid sugar - soda, juice, sweetened lattes - is explicitly called out in Principle 2 of the Fuel blueprint. It's not just that they're "empty calories." It's that fructose bypasses your body's regulatory mechanisms and creates liver fat directly.

And why Nassim Taleb's rule (consume drinks that are at least 1,000 years old) isn't just clever - it's metabolically sound. Water, tea, coffee, wine, kombucha - these drinks don't assault your liver with fructose.

Most everything invented in the last century does.

Why Your Body Responds Differently Than Mine

Now here’s where it gets interesting.

I just explained the insulin mechanism (from Fung) and the fructose problem (from Fung and Means). These are universal - they apply to everyone. But HOW MUCH any given food spikes YOUR glucose depends on factors unique to you.

This is where Eran Segal and Eran Elinav’s research for The Personalized Diet becomes critical. Their research involved putting continuous glucose monitors on 800+ people and tracking their responses to identical foods.

The results? Wildly different.

One person’s glucose spiked from bananas but stayed flat after ice cream. Another person showed the exact opposite pattern. Same foods, opposite responses.

What Determines Your Unique Response?

1. Genetics

• Some people have genetic variants that affect insulin sensitivity, glucose metabolism, and fat storage

• You can’t change your genetics, but you can work with them

2. Gut microbiome composition

• Beneficial bacteria ferment fiber into short-chain fatty acids (SCFAs) that improve insulin sensitivity

• Harmful bacteria produce inflammatory metabolites that worsen insulin resistance

• Your microbiome composition determines how you process specific foods

3. Sleep quality

• Poor sleep increases insulin resistance acutely (even one bad night impairs glucose tolerance)

• Chronic sleep deprivation worsens it long-term

4. Stress levels

• Cortisol (stress hormone) raises blood glucose and worsens insulin sensitivity

• Chronic stress = chronically elevated cortisol = metabolic dysfunction

5. Activity level and muscle mass

• Muscle is a glucose sink

• More muscle = better glucose disposal = lower insulin demand

6. Meal timing and circadian rhythm

• Insulin sensitivity is highest in the morning, lowest in the evening (as melatonin rises)

• Eating the same meal at 8 AM vs. 8 PM produces different glucose responses

The Limitation of Universal Dietary Advice

This is why rigid dietary dogma fails. “Eat this, not that” advice assumes everyone responds the same way. We don’t.

The fundamentals still apply universally - whole foods, stable glucose, adequate protein, healthy fats, plenty of fiber. But the details (rice vs. potatoes, oatmeal vs. eggs, intermittent fasting vs. regular meals) are individual.

The only way to know how YOUR body responds is to test. Either with a CGM (if accessible) or with careful symptom tracking (energy levels, cravings, mood, how you feel 2-3 hours post-meal).

Which brings me to my own experiment.

My CGM Experiment: What Two Weeks of Data Taught Me

I wore a continuous glucose monitor for two weeks as part of the FoodAndYou clinical trial at EPFL. The goal wasn’t optimization - I did this before reading deeply about glucose hacks - it was observation.

Inspired by the work of Fung, Segal and Elinav, I wanted to see how my body actually responded to the foods I eat regularly.

It was actually super fun to look at this data.

Here are the four key lessons.

Lesson 1: My Breakfasts Are On Point

What I eat most mornings:

• Skyr/Greek yoghurt parfait with fruits (kiwi, passion fruit, frozen berries), nuts/nut butter, chia seeds/flax seed, psyllium husks, cacao nibs.

• Chia pudding with a coulis of berries and nut butter.

Glucose response: Flat. Look at this graph where you see the days I ate my breakfasts (green) vs. the days I had to eat the “standard breakfasts” for the study (red - white bread alone, with butter or a standard glucose drink - yuk):

Why this works: Protein + fat + fiber - a perfect combo for stabilizing blood sugar and feeling full. I can go 3-4 hours easily after these breakfasts.

Lesson 2: Sweet Potatoes Spike Me (Sadly)

What happened: I love sweet potatoes. I thought they were a “healthy carb” and ate them regularly - roasted, mashed, in bowls.

Glucose response: Spike. Every. Single. Time.

Even when I added protein and fat (grilled chicken, olive oil), sweet potatoes still spiked me significantly. Not as high as eating them alone, but still well above my baseline.

Why this surprised me: Sweet potatoes have a lower glycemic index than white potatoes (in theory). But clearly, my body doesn’t handle them well.

What I changed: I didn’t eliminate sweet potatoes entirely - I still enjoy them occasionally. But I stopped treating them as a staple. I swapped them for other complex carbs (mostly legumes) that my body handles better.

Takeaway: “Healthy” is individual. Sweet potatoes might be fine for you. They’re not optimal for me. This is why personalized data matters.

Lesson 3: Movie Night Is a Metabolic War Zone (But I Still Do It)

Friday night ritual: Pizza + ice cream + a movie with my family.

Non-negotiable.

This is quality time, connection, joy. I’m not giving it up for perfect glucose curves.

Glucose response during the trial: Unmitigated disaster. Several huge peaks. Stayed elevated for hours. Glucose rollercoaster overnight (While I was sleeping!). Take a look at this graph showing several “normal nights” where glucose levels went back to baseline and stayed low overnight (green lines) vs. a typical movie night while wearing the CGM (red).

What I changed (after the trial):

• Swapped store-bought ice cream for homemade 'nice cream’ - frozen berries blended with Greek yogurt. Same creamy, cold, sweet experience. Way less sugar, way more protein.

• Walk on the treadmill for a while after eating. Not a workout—just a casual walk while we’re watching the movie. It helps me sleep better afterwards!

Takeaway: You don’t have to eliminate all foods you love or sacrifice family rituals for metabolic health. You should just be mindful about them and try to minimize the impact. As long as you’re not doing this every day, you’re OK!

Lesson 4: Biphasic Glucose Peaks

What I noticed: instead of a single rise and fall after certain meals, my glucose curve began to show two distinct peaks: a first rise, a drop, then a second, smaller rise before returning to baseline.

And sometimes three, as seen on the graph below!

At first glance, this looks like poor control - delayed digestion, unstable glucose, something “off”.

Actually, this pattern is frequently associated with better insulin sensitivity, not worse.

Multiple studies using oral glucose tolerance tests show that individuals with monophasic curves tend to have impaired early insulin secretion, higher insulin resistance, worse long-term metabolic outcomes, whereas biphasic curves are associated with more efficient glucose handling and healthier beta-cell function23.

Takeaway: Metabolism is complex and individual. Standard dietary advice can’t account for this level of nuance. If something doesn’t make sense, investigate. Test. Stay curious.

Share

Should You Try a CGM?

Honestly? Probably not necessary for most people.

CGMs are expensive and the data can be overwhelming if you don’t know how to interpret it.

A CGM is worth considering if:

• You’re curious about your personal responses to specific foods

• You’ve hit a plateau and want to troubleshoot what’s sabotaging you

• You have access through a clinical trial (like I did) or your doctor prescribes one

• You’re genuinely interested in self-experimentation and have the budget

Low-tech alternative: Track how you feel 2-3 hours after meals. Do you crash? Crave sugar? Feel foggy? That’s your body telling you the meal spiked your glucose. You don’t need a device to know when something’s off.

The 10 Glucose Hacks (From Jessie Inchauspé’s Glucose Revolution)

Now that you understand the insulin mechanism and why individual responses vary, let’s talk strategy.

Jessie Inchauspé’s Glucose Revolution distills years of glucose research into ten practical, evidence-based hacks. These aren’t theoretical - they’re actionable tactics you can implement today.

I didn’t optimize for these during my initial CGM trial (I read the book afterward), sadly. Who knows - I might re-do the experiment just to test them out systematically!

Here are all ten, with brief explanations:

1. Eat foods in the right order

Vegetables first, then protein and fat, then starches and sugars last.

Why it works: Fiber from vegetables creates a physical barrier in your gut that slows glucose absorption from the rest of your meal. Same foods, different order, dramatically different glucose response.

2. Add a veggie starter to all your meals

Even a small salad, some raw carrots, or steamed broccoli before your main course makes a difference.

3. Flatten your breakfast curve

Savory beats sweet every single time.

A sweet breakfast (toast, cereal, fruit smoothie) sets you up for glucose rollercoaster all day. A savory breakfast (eggs, vegetables, protein) stabilizes glucose and reduces cravings for hours.

4. Have any type of sugar you like - they’re all the same

Your body doesn’t distinguish between honey, agave, coconut sugar, white sugar, or maple syrup. They all spike glucose and insulin.

Don’t fall for “natural” sugar marketing. Sugar is sugar.

5. Pick dessert over a sweet snack

If you’re going to eat something sweet, eat it immediately after a meal rather than as a standalone snack.

Why: The fiber, protein, and fat from your meal slow the absorption of sugar. Eating dessert alone spikes you harder.

This doesn’t mean eat dessert every day - but if you’re going to have it, timing matters.

6. Reach for vinegar before you eat

1-2 tablespoons of vinegar (diluted in water or as salad dressing) before a meal blunts the glucose spike by ~20-30%.

Acetic acid slows gastric emptying and improves insulin sensitivity. Simple, cheap, evidence-backed.

7. After you eat, move

A 10-minute walk within 30 minutes of eating drops post-meal glucose measurably.

Why: Muscles absorb glucose directly from the bloodstream without needing insulin.

8. If you have to snack, go savory

Nuts, cheese, veggies with hummus, hard-boiled eggs - all better choices than fruit, crackers, granola bars, or anything sweet.

Better yet: don’t snack. Space meals 3-4 hours apart and let your insulin drop between meals.

9. Put some clothes on your carbs

Never eat naked carbs. Always add protein, fat, or both.

Toast → toast + avocado + egg Banana → banana + almond butter Rice → rice + salmon + olive oil

10. Stop counting calories

Calories matter for energy balance, but focusing on glucose stability is more important for metabolic health.

A 300-calorie muffin spikes glucose and insulin. A 300-calorie meal of eggs, avocado, and vegetables doesn’t.

Same calories, completely different metabolic outcome.

Which Hacks Made the 80/20?

When I was building the Fuel blueprint, I synthesized Inchauspé’s ten hacks alongside Fung’s insulin framework and Gottfried’s hormonal protocols. Here’s how they map:

Hacks 1 & 2 (food order, veggie starters) → Principle 1 & 4 (whole foods and eat plenty of fiber). Fiber first isn’t just about satiety - it’s about creating a physical barrier that slows glucose absorption.

Hack 10 (never eat naked carbs) → Principle 3 (eat enough protein, add natural fats). Protein and fat blunt the glucose spike, keeping insulin lower.

Hack 7 & 8 (vinegar, move after eating) → Advanced optimization. Solid evidence, easy to implement, but not essential if you’re doing Principles 1-5 consistently.

Hacks 3, 4, 5, 6, 9 → Principle 2. Understanding WHY savory breakfast beats sweet, or WHY dessert-after-meal beats standalone snack, reinforces the principles without adding complexity.

The bottom line: The Fuel blueprint includes the most impactful interventions from Inchauspé’s work (and Fung’s, and Gottfried’s) into five core principles. Master those first.

Add the tweaks as you’re ready.

When Keto Makes Sense (And When It Doesn’t)

Let’s talk about the Gottfried Protocol from Women, Food, and Hormones.

Dr. Sara Gottfried designed a four-week ketogenic reset specifically for perimenopausal and menopausal women whose bodies stopped responding to traditional approaches.

The structure:

• Week 1 (Prep): Detox with cruciferous vegetables, high fiber, gentle carb reduction

• Weeks 2-4 (Implementation): Strict ketogenic eating (net carbs <25g/day, ketogenic ratio 2:1 fat-to-protein+carbs)

• Transition: Gradual return to Mediterranean-style anti-inflammatory diet

Done 2x per year.

Who It’s For

This is NOT a first step. It’s for women who:

• Are in perimenopause or menopause

• Have tried the 80/20 consistently for months without results

• Are experiencing stubborn metabolic resistance (can’t lose weight, constant fatigue, brain fog despite “doing everything right”)

• Have medical supervision or guidance

Why Short-Term Keto Can Reset Insulin Sensitivity

Declining estrogen and progesterone make women more vulnerable to insulin resistance. Sometimes standard approaches aren’t enough.

A brief ketogenic phase forces your body to switch from glucose-burning to fat-burning (ketosis). This gives your insulin pathways a break, reduces liver fat, and can improve insulin sensitivity when you transition back to moderate carbs.

Key: It’s a RESET, not a lifestyle. Chronic keto has risks (nutrient deficiencies, hormonal disruption, loss of metabolic flexibility).

Swiss Army Mum angle

How this fits the Fuel blueprint: The Gottfried Protocol isn't part of the 80/20 because it's not for everyone. It's advanced optimization for a specific population - perimenopausal and menopausal women with stubborn metabolic resistance despite doing the fundamentals consistently. If Principles 1-5 are working, you don't need this. But if declining hormones have made standard approaches ineffective, Gottfried's short-term keto reset offers a science-backed intervention. I included it in "The Next Level" section of the blueprint for exactly this reason - it's a tool, not a foundation.

What’s Next

Next week: Genius Foods Deep Dive—the 10 foods that protect your brain while fixing your metabolism. Why wild salmon matters, what broccoli does to activate your body’s master antioxidant switch, and how to prioritize them without overthinking.

After that: Kombucha and gut health - how fermented foods support the metabolic allies we talked about in the Fuel blueprint.

Subscribe (free) so you don’t miss it.

Subscribe now

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share

Your Turn

Have you tried a CGM? What surprised you?

Which of the 10 hacks are you trying first?

Are you seeing patterns in your own glucose responses (even without a device)?

Comment below—I read every one.

See you next week.

— Mica

If you’ve been following along, you know I don’t just repeat what I read. I synthesize. I cross-reference. I test on myself. And I’m honest when sources conflict or when an author’s recommendations don’t match reality.

Earlier this week, I published the Fuel blueprint - the second component of the Body pillar. It synthesizes insights from eight books on metabolic health, glucose control, and nutrition science into one actionable framework.

Here’s my honest take on each one (in chronological order) as a busy woman - what resonated, what didn’t - and maybe enough to make you want to read them!

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

The Obesity Code (2016)

by Jason Fung, MD - Goodreads: 4.37/5 (38,000+ ratings)

The premise: Weight gain and insulin resistance are hormonal problems, not caloric ones. Chronically elevated insulin - driven by frequent eating and refined carbohydrates - causes obesity and metabolic disease. The solution: manage insulin through whole foods, intermittent fasting, and reducing meal frequency.

What it gets right: Fung’s explanation of the insulin-obesity connection is the clearest I’ve found. He dismantles the “calories in, calories out” myth with evidence and logic. The mechanisms he describes - how insulin drives fat storage, how frequent eating keeps insulin elevated - are rock solid.

What to watch for: The tone can be condescending. Fung sometimes writes as though anyone who doesn’t understand insulin resistance is willfully ignorant. It can be off-putting. Also, some of his fasting recommendations are aggressive. Not everyone needs that level of intervention.

My take: This was the first book I read on metabolic health, and it was eye-opening. It fundamentally changed how I think about fat storage and metabolism. The mechanics are fascinating, the science is solid. But the tone grated on me at times. Still, if you want to understand why glucose stability and insulin control matter so much, this is the book.

The Personalized Diet (2017)

by Eran Segal, PhD and Eran Elinav, MD, PhD with Eve Adamson - Goodreads: 4.12/5 (200+ ratings)

The premise: There’s no single “best diet” for everyone. Using continuous glucose monitors on thousands of participants, the authors discovered wildly different glucose responses to identical foods. The solution: personalized nutrition based on your unique biology - genetics, gut microbiome, sleep, stress, meal timing.

What it gets right: The research is fascinating and challenges one-size-fits-all dietary advice. One person spikes from bananas but not ice cream. Another shows the opposite. The studies are well-designed and the findings are compelling.

What to watch for: The book sometimes implies you need expensive testing, their proprietary app, and personalized protocols. You don’t. The fundamentals - whole foods, stable glucose, fiber, healthy fats—apply universally. Personalization is for fine-tuning, not foundations.

My take: I read this shortly after The Obesity Code and it inspired my own CGM experiment, which I did as part of a clinical trial at EPFL (Swiss Federal Institute of Technology). The idea that my body might respond differently than yours resonated immediately and was super interesting. It’s still not something I’d do on a regular basis, but a personal 2-4 week experiment would be extremely useful.

Genius Foods (2018)

by Max Lugavere - Goodreads: 4.19/5 (6,000+ ratings)

The premise: Ten specific foods protect your brain while improving metabolic function.

What it gets right: Lugavere synthesizes neuroscience and nutrition research into practical food choices. The ten foods are accessible, evidence-backed, and genuinely beneficial for both brain and metabolic health. It connects metabolic dysfunction to neurodegeneration clearly.

What to watch for: Lugavere relies heavily on animal studies (mice, rats). Animal research is valuable for mechanistic insights, but results often don’t translate to humans. The foods proposed fall perfectly into the 80/20 Fuel blueprint, so it’s not problematic to incorporate them.

My take: This is a solid, practical book. The ten-food framework is simple and actionable. But the animal study reliance bothers me—it’s a common issue in nutrition science, and Lugavere doesn’t always acknowledge the translation gap clearly enough.

Women, Food, and Hormones (2021)

by Sara Gottfried, MD - Goodreads: 3.33/5 (2,000+ ratings)

The premise: Hormonal imbalances during perimenopause and menopause make traditional strategies ineffective. Gottfried’s solution: a targeted four-week ketogenic protocol (the “Gottfried Protocol”) done twice a year to reset insulin sensitivity, followed by a Mediterranean-style diet.

What it gets right: Gottfried is a Harvard-trained gynecologist with clinical experience treating thousands of women. The protocol is designed for a specific population (perimenopausal women with stubborn metabolic resistance) and framed as a short-term reset, not a lifestyle. I appreciate that honesty - chronic keto has risks.

What to watch for: This book felt like a commercial. I lost count of how many times she said “the Gottfried Protocol.” It’s repetitive and self-promotional in a way that undermined the science for me.

My take: I appreciate the protocol as a targeted reset - maybe after a period of heavier eating (holidays, summer vacation). It’s not sustainable long-term, and I don’t think it needs to be. I found the 25g net carbs per day (total carbs minus fiber) easy to follow when I tested it. But the tone grated on me. Still, the information is solid if you can get past the marketing. I’m not surprised this one has the lowest rating of the list.

Glucose Revolution (2022)

by Jessie Inchauspé - Goodreads: 4.40/5 (49,000+ ratings)

The premise: How you eat matters as much as what you eat. Ten evidence-based hacks flatten your glucose curve: eat foods in the right order (vegetables first), add vinegar to meals, move after eating, choose savory over sweet breakfasts, and more.

What it gets right: This is the most practical, actionable glucose book I’ve found. Inchauspé makes complex science accessible without dumbing it down. Her hacks are simple, evidence-backed, and implementable immediately.

What to watch for: Some critics say she oversimplifies. I disagree - she’s just good at distilling research into clear principles. The hacks work. The science holds up.

My take: I read this book after my CGM experiment. Too bad! I would have loved to test whether food order, vinegar, and movement timing actually made a measurable difference. Maybe I’ll do a new test adding these hacks to test them on myself! That’s the beauty of CGMs and books like this.

Next Level (2022)

by Stacy Sims, PhD - Goodreads: 4.25/5 (5,000+ ratings)

The premise: Women are not small men. Female physiology - hormonal fluctuations across the menstrual cycle and through perimenopause and menopause - requires different strategies than what works for men. Sims offers science-backed protocols tailored for women over 40, covering exercise, nutrition, and recovery.

What it gets right: This is excellent, especially because it’s tailored specifically for women. The other books on this list (except Gottfried’s) - even when based on solid science - are mainly skewed toward male biology. Sims tackles this head-on, particularly for peri- and post-menopause. Her section on high-intensity interval training (HIIT) for menopausal women and her explanation of how declining estrogen affects metabolism are invaluable.

What to watch for: It goes into too much detail in places. The chapter on hydration, for example - adding exact grams of sodium and electrolytes to water. For a normal human being doing normal human being activities, water should be the best hydrating liquid. We evolved for that. I also chose to ignore the strict timing around exercise (eat within 30 minutes or you lose your window). I exercise, then I eat. I don’t stress about the exact timing. But then again, I’m not aiming for performance, just to be healthy.

My take: Sims’ previous book, ROAR, was more tailored for women in reproductive age and focused on optimizing performance based on menstrual cycles. I stopped halfway through - it was too focused on high performance. I’m not a high-performance athlete. I just want to be healthy and age well. Next Level is better, more relatable to everyday women. Despite the occasional over-specificity, it’s an excellent resource.

Outlive (2023)

by Peter Attia, MD - Goodreads: 4.33/5 (96,000+ ratings)

The premise: Modern medicine keeps you alive but doesn’t help you live well. Attia argues for a shift from reactive, disease-focused care (”Medicine 2.0”) to proactive, longevity-focused care (”Medicine 3.0”). The book covers the “Four Horsemen” of chronic disease - heart disease, cancer, neurodegeneration, type 2 diabetes - and offers evidence-based strategies to prevent them: strength training, cardiovascular fitness, metabolic health, sleep optimization, and emotional well-being.

What it gets right: The metabolic health section is outstanding. His emphasis on glucose and insulin control as the foundation of metabolic health is exactly right. He cites authoritative sources and backs everything with research.

What to watch for: This is a dense, 500+ page book. It’s heavy on science and can feel overwhelming. Attia also leans heavily on expensive interventions (continuous glucose monitors, advanced bloodwork, personalized protocols). His thing is exercise - he positions it as the single most important lever for longevity. And he’s not wrong, but every author does this: flatten the glucose curve (Inchauspé), avoid toxins at all costs (Means), exercise is everything (Attia). I’m guessing the truth lies somewhere in between.

My take: Attia is very comprehensive and I appreciate his rigor. But the book is long, and not everyone needs 500 pages to understand the basics. I’ve distilled the most actionable insights into the SAM framework so you don’t have to slog through it all (though if you’re into deep dives, it’s worth it).

Good Energy (2024)

by Casey Means, MD - Goodreads: 4.07/5 (24,000+ ratings)

The premise: Metabolic dysfunction - cells losing the ability to produce energy efficiently - is the root cause of nearly every chronic disease. The solution: address mitochondrial damage, chronic inflammation, and oxidative stress through whole foods, movement, sleep, and stress management.

What it gets right: Means connects the dots between cellular energy production and chronic disease brilliantly. Her emphasis on metabolic health over weight loss reframes nutrition in a way that’s empowering rather than punishing. The science is solid. Her section on biomarkers is particularly helpful and informed the tracker I built.

What bothered me: The book has an esoteric, almost idealistic tone that doesn’t resonate with me. I prefer facts over personal narratives. Even the title - ”Good Energy” versus “Bad Energy” instead of metabolic health or dysfunction - echoes the rest of the book’s vibe. More problematic: Means pushes hard on organic, biodynamic, toxin-free everything. Buy grass-fed, pasture-raised, pesticide-free, or you’re dooming yourself to metabolic dysfunction. This puts unrealistic pressure on individuals, many of whom simply can’t afford that lifestyle.

My take: Get the best quality you can afford. Minimize toxin exposure where possible - use apps like EWG or Yuka to choose between products when you have options. But don’t let perfect be the enemy of good. Eating conventional broccoli beats skipping vegetables because you can’t afford organic.

The Bottom Line

These eight books don’t always agree. Nutrition science is messy. Honest researchers acknowledge uncertainty.

But the principles that emerge consistently across all of them form the foundation of the SAM Fuel framework:

• Prioritize whole, unprocessed foods

• Stabilize glucose and manage insulin (avoid sugars, processed grains and vegetable oils)

• Eat adequate protein, healthy fats, and plenty of fiber

• Space your meals and fast overnight

• Support your microbiome

• Don’t let perfect be the enemy of good

You don’t need to read all eight books. I’ve done that work and distilled the best parts into the Fuel blueprint. But if you want to go deeper on a specific topic, here’s a quick guide:

• Start here: Glucose Revolution (most practical) or The Obesity Code (best mechanism explanation)

• For women 40+: Next Level (exercise and nutrition for perimenopause/menopause)

• For deep science: Outlive (comprehensive, research-heavy)

• For personalization: The Personalized Diet (why bodies respond differently)

What’s Next

Next week: Deep Dive into your personal glucose response - plus my CGM experiment results.

Subscribe (free) so you don’t miss it.

Subscribe now

Thank You

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space.

Share Swiss Army Mum

See you next week.

— Mica

Your Turn

Have you read any of these books? What resonated with you? What felt off? Which one should I review next?

Comment below—I read every one.

We started with the Body pillar, because without physical foundations, nothing else sticks. First up was Sleep — the non-negotiable foundation.
If sleep is off, everything downstream breaks: energy, blood glucose stability, training, mood, decision-making.

This week: Fuel. Not diets. Not perfection.

Food as information, stabilizing blood sugar as the master lever, and the changes that actually move the needle.

This post sits in the Fuel area of the Body Pillar. Fuel is the metabolic lever of the Body triad: where Sleep is the foundation your cells repair themselves on, Fuel is the signal system, the instructions your body receives every time you eat. Get those signals right and the returns from Exercise compound; get them chronically wrong and no amount of training fully compensates. Glucose control, the central mechanism here, also feeds directly into the Mind Pillar, since stable blood sugar is one of the quieter inputs to mood and cognitive function.

A Word on Nutrition Science

So much ink has been spilled on nutrition science. Low-fat vs. low-carb. Keto vs. Mediterranean. Red meat kills you vs. red meat saves you. Every week, a new headline contradicts last week’s advice.

Here’s why: nutrition science has methodological issues.

Most of what you read comes from observational (epidemiological) studies. Researchers track large groups of people over time, collecting data on their eating habits and health outcomes (cancer, heart disease, etc.). The problem? These studies cannot distinguish between correlation and causation1. Correlation indicates that A and B vary together, while causation requires evidence that changes in A are responsible for changes in B.

Add to that recall bias (subjects must remember what they ate weeks or months ago - nearly impossible to do accurately) and healthy user bias (health-conscious people engage in many virtuous behaviors simultaneously, making it impossible to isolate the effect of one food), and you have unreliable data.

Newer methods like Mendelian randomization2 (using genetic variation as a proxy for randomized trials) and animal models (mice, rats, fruit flies with shorter lifespans) offer some clarity, but they come with caveats. Genetic studies are limited to specific populations, and animal results often fail to translate to humans (A 16-hour fast for a mouse is equivalent to a multi-day fast for a human due to metabolic differences.).

So what do we actually know?

Despite the noise, certain principles emerge consistently across high-quality research:

• Whole, unprocessed foods outperform ultra-processed foods

• Stable blood sugar matters

• Fiber, healthy fats, and adequate protein are essential

• Ultra-processed foods, refined sugars, and seed oils drive metabolic dysfunction

Everything beyond that is optimization - useful and interesting but not essential.

This post focuses on what we know works. Not diet dogma. Not the latest trend. Just the biology of how your cells produce energy, and what sabotages that process.

New here? Start here:

Swiss Army Mum is a practical guide to long-term health for busy women, built on four pillars: Body, Mind, Glow, and Flow.

Not every tool. Just the right ones.

Subscribe now

Why Fuel Matters: The Metabolic Dysfunction Framework

What Is Metabolic Dysfunction?

Metabolic dysfunction is your cells losing the ability to produce and use energy efficiently. It’s a mismatch between our modern environment (ultra-processed foods, sedentary lifestyle, chronic stress) and our evolutionary metabolism (designed for whole foods, movement, intermittent food scarcity).

The modern paradox

Nassim Taleb writes about antifragility3 - systems that benefit from stress to get stronger. Our body is antifragile by nature. It’s designed for intermittent food scarcity, physical challenge, and environmental variability. Evolution shaped us to handle hunger, cold, heat, exertion. Small stressors.

Modernity removed all that: constant - and excessive - food availability, climate-controlled environments, sedentary jobs, engineered foods that require zero digestive effort. The result? Metabolic fragility.

I’m not suggesting we return to medieval living, but we do need to be mindful of how excess comfort and abundance wreck our systems. A little hunger sharpens metabolic function. A little movement builds resilience and strength. A little temperature variation strengthens mitochondria. Modern life offers none of this unless we deliberately reintroduce it.

Key metabolic dysfunction processes

Metabolic dysfunction manifests through three interconnected processes that feed each other in a vicious cycle:

• Mitochondrial4 dysfunction: Chronic fuel overload damages mitochondria, reducing ATP production (low energy), driving fat accumulation inside cells, and creating cellular “starvation” despite abundant calories.

• Chronic inflammation: Malfunctioning mitochondria trigger persistent low-grade inflammation, leading to progressive tissue damage, accelerated aging, and chronic disease (“inflammaging”).

• Oxidative stress: Damaged mitochondria generate excess free radicals, causing widespread molecular damage to blood vessels, brain, and tissues - and reinforcing inflammation and mitochondrial failure in a self-perpetuating loop.

How metabolic dysfunction shows up

Long before a doctor ever says “insulin resistance” or “metabolic syndrome,” the body starts sending quiet distress signals. Sugar cravings ramp up, hunger never quite switches off, and energy crashes hard in the afternoon. Focus slips. Brain fog rolls in. Skin often tells the truth first: acne, inflammation, dullness, faster-than-expected aging. None of this feels dramatic enough to be “a problem,” but taken together, it’s your metabolism struggling to keep up.

Under the hood, measurable changes are already happening. Cells become less responsive to insulin, forcing the pancreas to pump out more of it just to keep blood sugar stable - hyperinsulinemia that can persist for years before fasting glucose finally rises. Excess glucose binds to proteins through glycation, damaging blood vessels, stiffening tissues, and accelerating aging in the brain and body.

These processes tend to cluster into metabolic syndrome: rising blood pressure, high triglycerides, low HDL, central fat gain, and creeping fasting glucose.

Left unaddressed, this trajectory feeds directly into the “Four Horsemen” of modern chronic disease - cardiovascular disease, cancer, neurodegeneration, and type 2 diabetes. This isn’t bad luck. It’s a slow, predictable progression.

What drives metabolic dysfunction?

As Taleb puts it: modernity.

The modern diet quietly pushes metabolism off the rails. It’s not just “too many calories,” but chronic over-nutrition layered on top of foods engineered to override satiety. Ultra-processed products - refined sugars, refined grains, industrial seed oils - deliver energy without signaling fullness, encouraging constant intake without true nourishment. Excess sugar, especially fructose and liquid sugar, overloads the liver, where it’s rapidly converted to fat and stored, driving hepatic fat accumulation and insulin resistance.

Refined carbohydrates amplify the problem by spiking glucose quickly, suppressing fat oxidation, and keeping the body locked into a sugar-burning mode. Add industrial trans fats and unstable seed oils, and you get low-grade inflammation and cellular damage. Meanwhile, the absence of real food - fiber-rich, micronutrient-dense whole foods - starves both your cells and your gut microbiome of the signals they need to regulate metabolism properly.

Modern lifestyle compounds the damage. Poor sleep - which we covered in detail last week - drives metabolic, inflammatory, and microbiome disruption. Chronic stress keeps the sympathetic nervous system switched on, driving cortisol, worsening insulin resistance, and amplifying inflammatory pathways. Long hours of sitting reduce muscle glucose uptake and erode metabolic flexibility - the ability to switch efficiently between carbohydrates and fats as fuel.

None of these factors act alone - but together, they create a metabolic environment where dysfunction becomes the default rather than the exception.

The Microbiome

Your gut microbiome - the trillions of bacteria, fungi, and other microorganisms living in your digestive tract - is not a passive bystander. It’s an active metabolic organ that influences insulin sensitivity, inflammation, nutrient absorption, and even mood regulation through the gut-brain axis.

Beneficial bacteria ferment fiber into short-chain fatty acids like butyrate, which improve insulin sensitivity and reduce inflammation. They strengthen your gut barrier, preventing bacterial fragments from leaking into your bloodstream and triggering systemic inflammation. They synthesize vitamins, regulate appetite hormones, and communicate directly with your mitochondria.

Harmful bacteria - fed by ultra-processed foods, refined sugars, and artificial sweeteners - do the opposite. They weaken the gut barrier (”leaky gut”), produce inflammatory metabolites, and worsen insulin resistance.

What you eat shapes which bacteria thrive. Ultra-processed foods starve beneficial bacteria (no fiber) and feed harmful ones (refined sugars). Whole foods do the opposite. This is one reason why whole-food diets improve metabolic health so dramatically - they restore a healthy microbiome, which in turn supports healthy metabolism.

Blood Glucose Level as the Central Metric

Why We Focus on Glucose

Glucose is the metric we focus on - not because it’s perfect, but because it’s the most practical window we have into metabolic health. The ideal marker would be insulin. Insulin resistance develops years before blood glucose ever looks abnormal, and many people with “normal” fasting glucose are already living with chronically elevated insulin.

That’s metabolic dysfunction in disguise.

The problem is that fasting insulin isn’t routinely tested, and continuous insulin monitoring doesn’t exist. Glucose, by contrast, is easy to measure, responds in real time to food and lifestyle, and stabilizing it reliably reduces insulin exposure downstream.

It’s an imperfect proxy - but the best one we’ve got.

Why Glucose Matters

Blood sugar levels matter because it acts as a master regulator. How high it rises and how fast it falls shape hunger and satiety, mood, focus, immune function, inflammation, and the pace of biological aging.

Big spikes lead to crashes, cravings, irritability, and brain fog. Repeated spikes suppress immune responses, increase systemic inflammation, and accelerate aging through glycation - where excess sugar permanently damages proteins and tissues.

The goal is simple and powerful: stabilize glucose, reduce insulin demand, and prevent metabolic dysfunction before it becomes disease.

Harmful Effects of Chronic Glucose Spikes

A blood sugar spike is typically defined as a rise of more than about 30 mg/dL (1.7 mmol/L) after eating. In the short term, this shows up as the familiar post-meal crash, sugar cravings, foggy thinking, irritability, and hunger shortly after you’ve eaten - often driven by an insulin overshoot that pushes glucose too low.

Over time, the damage runs deeper. Mitochondria are flooded with fuel and respond by producing excess free radicals, creating oxidative stress that damages DNA and cellular machinery. Excess glucose binds to proteins, forming advanced glycation end-products that stiffen tissues, damage blood vessels, and impair brain function. Together, oxidative stress and glycation drive chronic inflammation and force the pancreas to pump out ever-higher levels of insulin, gradually pushing cells into insulin resistance and locking in fat storage.

This progression is slow, quiet, and easy to miss. You can spend years with a “normal” fasting glucose while post-meal spikes regularly hit 160–180 mg/dL. The damage accumulates in the background.

By the time fasting glucose crosses the clinical threshold for pre-diabetes, metabolic dysfunction has usually been brewing for a decade. The diagnosis comes late. The biology does not.

Whole Foods vs. Ultra-Processed Nightmares

The pattern across cultures is remarkably consistent. Diets associated with long-term metabolic health all tend to flatten the glucose curve. Traditional Mediterranean diets in Greece, Italy, and Spain. Pre-Westernized Asian diets like those of Japan and Okinawa. Whole-food plant-based approaches. Even ancestral or paleo-style diets - when they’re built around real food rather than processed “health” products. Different cuisines, different philosophies, same metabolic outcome: stable blood sugar and low insulin demand.

What these diets share matters more than what they’re called. They’re anchored in whole, minimally processed foods. They’re naturally high in fiber from vegetables, legumes, and intact grains. They rely on healthy fats like olive oil, nuts, and oily fish, include protein, and keep added sugars and refined grains to a minimum.

These features slow digestion, blunt glucose spikes, and give cells the nutrients and signals they need to regulate energy properly.

In contrast, metabolic dysfunction thrives on the opposite pattern. The standard Western diet - and any diet dominated by ultra-processed foods - creates a glucose rollercoaster: high in added sugars, refined carbohydrates, and industrial seed oils, and chronically low in fiber and micronutrients. The result is rapid spikes, hard crashes, constant hunger, and escalating insulin exposure.

The 80/20: Five Principles That Flatten the Curve

To stabilize blood sugar naturally, prioritize whole unprocessed foods, cut added sugars and seed oils, eat adequate protein and healthy fats with every meal, consume plenty of fiber daily and time your eating window. These five principles reduce glucose spikes, lower insulin exposure, and prevent metabolic dysfunction.

Principle 1: Prioritize Whole, Unprocessed Foods

What: Vegetables, legumes, whole fruits, quality protein, nuts, seeds, olive oil, oily fish

Why: Ultra-processed foods are engineered to bypass satiety signals. They’re stripped of fiber and micronutrients, designed to make you overeat. They spike glucose, overload mitochondria, and starve beneficial gut bacteria. Whole foods provide what your cells actually need: fiber, vitamins, minerals, polyphenols, omega-3s. They’re naturally satiating, nutrient-dense, and support a healthy microbiome.

How to identify minimally processed foods:

Here’s a simple rule of thumb: eat the ingredients, not food with a list of ingredients. Chicken breast is the ingredient. Chicken nuggets with twenty ingredients you don’t recognize are a processed food.

Shop the perimeter of the grocery store. The outer edges are where whole foods live: produce, meat, dairy, eggs. The center aisles are where ultra-processed products hide. Spend eighty percent of your time and budget on the perimeter.

Principle 2: Cut Added Sugars, Refined Grains, and Seed Oils

What to cut: Added sugars (soda, juice, sweetened coffee, desserts, granola bars, “healthy” protein bars, flavored yogurt), refined grains (white bread, pastries, most breakfast cereals, white rice, crackers), and seed oils (corn, soybean, sunflower, canola - swap for extra-virgin olive oil, avocado oil, or coconut oil).

Why: These three are the primary drivers of glucose spikes, insulin resistance, and inflammation. They’re everywhere in ultra-processed foods, so avoiding them naturally pushes you toward whole foods.

Special focus on liquid sugar

Soda, juice, smoothies, sweetened lattes, and energy drinks are the fastest route to insulin resistance and fatty liver. Fructose in liquid form bypasses normal glucose regulation and goes straight to the liver, where it’s rapidly converted to fat.

What to drink instead: Nassim Taleb has a rule I love: “only consume drinks that are at least a thousand years old”. Water. Tea (green, black, herbal). Coffee (black, or with minimal milk or cream - no sugar). Wine in moderation. Kombucha.

If it was invented in the last century - soda, energy drinks, vitamin water, fruit juice, cocktails - skip it.

Principle 3: Eat Enough Protein, Add Natural Fats

What: Protein sources include eggs, fish, Greek yogurt, legumes, poultry, and grass-fed meat. The RDA of 0.8 g/kg body weight is a survival minimum designed to prevent deficiency, not a target for thriving. Most active adults do better with 1.2–2.2 g/kg depending on age and activity level. For fats, prioritize extra-virgin olive oil, avocado, nuts, seeds, and oily fish like salmon, mackerel, and sardines.

Why: Protein and fat together slow glucose absorption and increase satiety. They blunt the glucose spike from carbs, keeping your blood sugar stable. Protein also preserves muscle mass, and muscle is a glucose “sink” - it absorbs glucose without requiring insulin. The more muscle you have, the better your metabolic health. Monounsaturated fats from olive oil and avocado improve insulin sensitivity. Omega-3s from oily fish, walnuts, and flaxseeds reduce inflammation, support brain health, and improve mitochondrial function.

Principle 4: Eat Plenty of Fiber

Target: 25-50 grams per day. Start where you are and increase gradually - sudden jumps cause digestive distress like bloating and gas.

Sources: Vegetables, especially leafy greens, broccoli, and Brussels sprouts. Legumes like lentils, chickpeas, and black beans. Whole fruits like berries and apples with the skin on. Chia seeds, flaxseeds, psyllium husk.

Why it matters: Fiber slows glucose absorption by creating a physical barrier in your gut. Think of it like this: when you eat a salad before pasta, the fiber from the vegetables forms a mesh that slows down glucose absorption from the pasta. Same meal, same calories, dramatically different glucose response. Fiber also feeds beneficial gut bacteria, which produce short-chain fatty acids that improve insulin sensitivity. And it increases satiety - you feel full longer, reducing the urge to overeat.

Start every meal with vegetables if you can. It’s the easiest habit to implement because you’re just rearranging what’s already on your plate.

Principle 5: Space Your Meals and Fast Overnight

What: Eat at regular intervals (3-4 hours between meals), finish eating 2-3 hours before bed, and don’t snack until morning. This creates a natural 12-14 hour overnight fast without aggressive time restriction. This aligns with your circadian rhythm—insulin sensitivity naturally decreases in the evening as melatonin rises, so eating late compounds the problem.

Why: Constant grazing prevents your stomach from emptying fully and keeps insulin chronically elevated. Your digestive and hormonal systems need regular rest to function optimally. However - and this matters especially for women - aggressive fasting protocols can backfire.

Caloric restriction extends lifespan in animals (yeast, worms, mice), and that’s led to enthusiasm for intermittent fasting in humans. The problem? Studies in humans show mixed results, and emerging research on women specifically suggests that prolonged fasting windows may disrupt menstrual cycles, increase cortisol, and paradoxically worsen insulin sensitivity in some women.

Pro Tip: The “Kitchen Closed” Rule

Set a time when the kitchen closes for the night (e.g., 7 PM). After that: water, herbal tea, or nothing. No exceptions. Makes the decision automatic - no nightly willpower battles.

Self assessment

Are You Metabolically Healthy?

Answer yes or no:

Do you crash two to three hours after meals? Do you crave sugar or need snacks between meals? Do you rely on caffeine to function in the afternoon? Do you wake up hungry or feel “hangry” often? Do you struggle with brain fog, especially mid-afternoon? Do you have trouble losing weight despite “eating healthy”? Do you feel tired despite getting enough sleep?

If yes to two or more, your glucose is likely spiking and crashing.

The 80/20 above will fix this.

The next level

Here’s what we know works: whole foods, stable glucose, protein, healthy fats, plenty of fiber, letting your system rest.

Everything beyond that is optimization - useful and interesting, but not essential.

The 80/20 alone will already do wonders for your metabolic health.

Here’s where you can dig deeper afterwards:

Why Your Glucose Response is Unique

When researchers put continuous glucose monitors on thousands of people, they discovered something surprising: identical foods produced wildly different responses. One person’s glucose spiked from bananas but stayed flat after ice cream. Another showed the opposite pattern. Your unique response depends on genetics, gut microbiome, sleep quality, stress levels, even meal timing. This is why some people thrive on rice while others do better with potatoes. Why intermittent fasting works brilliantly for some and backfires for others (hello female hormones?). The fundamentals still apply universally—but personalization matters.

The good news? You don’t need a research lab to figure out what works for you. Jason Fung’s The Obesity Code explains the insulin resistance mechanism that underlies why different foods affect people differently. Jessie Inchauspé’s Glucose Revolution offers ten practical hacks to flatten your curve regardless of what you eat—food order, vinegar timing, post-meal movement windows, why dessert after dinner beats an afternoon snack. Eran Segal and Eran Elinav’s The Personalized Diet shows you how to test your own biology using simple tools. And for women whose bodies stopped responding to traditional approaches? Sara Gottfried’s short-term ketogenic protocol offers a targeted reset when declining hormones make standard interventions less effective.

I’ll synthesize all four into one post: understand the mechanism (insulin), implement universal strategies (the ten hacks), test what’s unique to you (personalized experimentation), and deploy advanced interventions only when needed (strategic keto). Plus my own two-week CGM experiment - what spiked me, what didn’t, and what I changed because of the data.

The Blood Tests Your Doctor Isn’t Ordering, But Should

Fasting glucose is a lagging indicator - by the time it’s abnormal, dysfunction has been brewing for years. We’ll cover what to test, what optimal ranges actually are (not just “normal”), and how to use these as feedback loops.

I’ll show you the Google Sheet tracker I built to monitor my metabolic health over time.

References & Further Reading

This post synthesizes insights from multiple sources. If you want to go deeper into any aspect of metabolic health and nutrition, check out my Book Club post.

What’s next?

Next week: Deep Dive into your personal glucose response. We’ll synthesize The Obesity Code, Glucose Revolution, The Personalized Diet, and the Gottfried Protocol into one cohesive story - plus my CGM experiment results.

After that: Gut health and how I brew my own Kombucha, gaining clarity over your metabolic health and how to track it easily (I’ve done it for you!).

We’re in for a fun ride! Make sure you fuel properly 😉.

Subscribe so you don’t miss it.

Subscribe now

Thank you!

If you made it this far, congratulations! You now have an understanding of why metabolic health is important and how to tweak your eating habits to get there.

Thank you for reading, sharing, and supporting this work. Whether you’ve been here since the beginning or just found Swiss Army Mum, I’m glad you’re here.

Building sustainable health without overwhelm takes a village. If something resonated with you, I’d be grateful if you forwarded this to someone who might benefit or hit the ♥️ or ↻ Restack button. It helps more people discover this space and build sustainable health without the overwhelm.

Share Swiss Army Mum

See you next week!

Your turn

What’s your biggest Fuel challenge right now? Sugar cravings? Afternoon crashes? Confusion about what actually counts as “healthy”? Comment below—I read every one.