PERIMENOPAUSE AND WEIGHT
Why your body is changing shape, why the scales don't tell the full story, and what actually helps.
By Katie Rice | Accredited Naturopath & Nutritionist | Her Herbs Founder
Your diet hasn't changed. You're moving your body. But something is shifting anyway. Weight is settling around your middle in a way it never used to. Your clothes fit differently even when the number on the scales hasn't moved much. You feel like your body is operating by a different set of rules and nobody told you.
You're not imagining it. And it's not a willpower problem.
During perimenopause, the body undergoes a genuine shift in how it stores fat, uses energy, and maintains muscle. Understanding what's actually happening, and why, is the first step toward working with your body rather than fighting it.
It's Not Just Weight. It's Redistribution.
This is the piece that explains why the scales can feel so misleading during perimenopause.
Research from the SWAN study, one of the most comprehensive long-term investigations into women's health through the menopause transition, found that visceral fat, the metabolically active fat stored deep in the abdominal cavity, rose by over six percent per year during the transition. Android fat, the fat stored around the middle and upper body, increased before menopause, accelerated through perimenopause, and then slowed after menopause.
What this means in practice is that body composition is changing significantly even when total weight changes only modestly. Two women with the same BMI can have very different health pictures depending on how much visceral fat they're carrying and how much lean muscle mass they've retained. The scale captures one number. It doesn't capture the shift.
A 2025 NIH summary put it plainly: perimenopausal women tend to gain more body fat, particularly abdominal fat, because hormonal changes combine with reduced energy expenditure. The British Menopause Society cites average weight gain of around 1.5 kg per year during the transition, with much of it accumulating around the abdomen and upper body.
This is why so many women describe a "menopause belly" that appeared without any obvious change in their habits. It's not imagination. It's physiology.
Why Oestrogen Matters More Than Most People Realise
From a naturopathic perspective, oestrogen is far more than a reproductive hormone. It plays a direct role in regulating fat storage, appetite signalling, insulin sensitivity, and energy expenditure. When oestrogen levels begin to fluctuate and decline during perimenopause, those regulatory functions become less stable.
The body shifts toward storing more fat centrally rather than peripherally. Insulin sensitivity can reduce, meaning the body has to work harder to manage blood glucose. Energy expenditure at rest decreases. The hormonal environment that previously supported a particular body composition changes, and the body adapts accordingly.
This isn't a failure. It's a biological response to a significant hormonal transition. But understanding the mechanism matters, because it points toward what will actually help.
The Lean Mass Piece
Body composition during perimenopause isn't only about fat gain. Lean muscle mass can also decline during this transition, which affects strength, metabolism, and how the body functions at any given weight.
Muscle is metabolically active tissue. It burns more energy at rest than fat does, which means that losing lean mass while gaining fat can shift the metabolic rate downward, making it easier to gain weight and harder to lose it. This is a compounding effect that the scales alone won't show you.
Preserving and building lean mass during perimenopause is one of the most important things you can do for your long-term metabolic health. Not just aesthetically. Functionally, metabolically, and for cardiometabolic risk.
What to Actually Measure
If you're tracking body changes during perimenopause, BMI is too blunt a tool to be particularly useful. More informative markers include waist circumference, waist-to-height ratio, body fat percentage, and lean mass.
DXA body composition scanning, where available, gives the most complete picture. But even a consistent waist circumference measurement tells you more about what's happening metabolically than the number on the scales. A 2024 review explicitly recommended body composition analysis as a practical outpatient tool for exactly this reason.
A Naturopathic Approach to Body Composition in Perimenopause
From a naturopathic perspective, the goal during this transition isn't weight loss as an isolated target. It's supporting body composition, metabolic health, and hormonal balance together, because they're inseparable.
Resistance training is the single most important movement shift you can make during perimenopause. Not because it burns the most calories, but because it preserves and builds lean muscle mass, directly counteracting the compositional shift that declining oestrogen drives. Two to three sessions a week of weight bearing or resistance based movement is where the evidence consistently points.
Protein. Adequate protein intake supports lean mass preservation, promotes satiety, and helps stabilise blood sugar. During perimenopause, protein needs are often higher than women realise, and undereating protein while trying to reduce overall intake is counterproductive to the very thing that supports metabolism.
Blood sugar regulation. Insulin resistance is a real feature of the perimenopausal transition for many women, and it directly influences fat storage patterns. A low glycemic, anti-inflammatory dietary approach, built around whole foods, fibre, healthy fats, and adequate protein, supports insulin sensitivity in a way that calorie restriction alone doesn't.
Sleep. Poor sleep elevates cortisol, drives insulin resistance, increases appetite signalling for high-energy foods, and directly promotes central fat storage. Addressing sleep during perimenopause isn't separate from managing body composition. It's part of it.
Stress and cortisol. Chronic cortisol elevation promotes visceral fat accumulation. The adrenal and hormonal load during perimenopause is significant, and stress management isn't a soft suggestion here. It's a metabolic lever.
Herbal and nutritional support. There are herbs and nutrients that support hormonal balance, insulin sensitivity, and the body's ability to manage the perimenopausal transition from the inside. Working with a naturopath to identify what's most relevant to your individual picture, whether that's adrenal support, blood sugar regulation, or oestrogen metabolism, allows for a targeted approach rather than a generic one.
What to Raise With Your Practitioner
If you're experiencing rapid central weight gain, worsening fatigue alongside body composition changes, or signs of insulin resistance like blood sugar instability or darkened skin patches, it's worth asking for thyroid function testing, fasting insulin and glucose, iron studies, and ideally a proper body composition assessment.
These changes don't have to be accepted as inevitable. They have causes, and those causes respond to the right support.
If you want to go deeper on naturopathic support through the perimenopause transition, the Her Herbs Perimenopause Series covers the full picture.
EXPLORE THE HER HERBS PERIMENOPAUSE SERIES
A Note From Katie
"The women I saw in clinic who were struggling with body changes in perimenopause had almost always been told to eat less and move more. And most of them were already doing both. What they needed wasn't more discipline. It was an understanding of what was actually happening hormonally and metabolically, and a plan that worked with that reality rather than against it. Your body is not broken. It's in transition. And there is a lot that can be done to support it through that."
-Katie Rice, Naturopath & Founder, Her Herbs
This content is for educational purposes only and does not constitute medical advice. Please consult your healthcare provider regarding your individual health concerns.
