Why You're Gaining Weight During Menopause (And It's Not Your Fault)
Those black jeans from M&S don't fit anymore. The ones that always fit, that you bought two sizes up last year just in case. They don't fit either. You've been eating less (tracking everything on that app your daughter showed you), walking more (10,000 steps, you've been obsessive about it), but last Tuesday you stepped on the scales in Boots and just stood there. Couldn't move. Wanted to cry right there in front of everyone buying paracetamol and shampoo.
You’ve been Googling "menopause weight gain dangerous diabetes heart disease" because you keep thinking about your mum's type 2. Yesterday morning you stood in front of the mirror getting dressed for work and genuinely didn't recognise the shape looking back. Your face, yes. But the rest? Where did this come from? It's bloody terrifying, if we're honest.
Before you spiral further (because we know you're already compiling a mental list of everything you must be doing wrong), you need to know: over half of all women experience weight gain during perimenopause and menopause. This isn't happening because you're failing.
Why You're Gaining Weight
Your body is going through massive hormonal chaos right now. Women gain an average of 1.5kg per year during the perimenopause transition, which (and we know this is the frustrating bit) can last anywhere from a few years to a decade. That adds up to around 10kg by the time menopause actually arrives. Ten kilos. A stone and a half. When you've done nothing different.
(And we get why you're probably worrying whether it's something more serious. Whether it’s a problem with your thyroid. Whether you've somehow developed insulin resistance overnight. We'll come back to that.)
Your oestrogen levels are dropping, and oestrogen isn't just about periods. It helps regulate how your body uses calories, where it stores fat, how efficiently you burn energy. When it drops, your metabolism slows. You're burning fewer calories at rest than you were before, even though you're eating the same or less. It's not fair. But it's biology.
You're also losing muscle. As oestrogen drops, you naturally lose lean muscle tissue. Muscle burns more calories than fat (even when you're sitting still, doing absolutely nothing). So as muscle decreases, your metabolic rate drops even further. This is the bit that feels like your body's actively working against you.
And then there's where the fat goes now. Before perimenopause, oestrogen helped direct fat to your hips, thighs, bottom. Now? It's redirecting to your abdomen and midsection. Even if the number on the scales hasn't changed dramatically, your shape probably has.
Then the vicious cycle starts. Poor sleep from night sweats makes you hungrier and less likely to exercise. When you're exhausted, your body craves quick energy. Biscuits. Toast. Crisps at 3pm. You're not weak. You're coping with hormonal havoc.
Where the Weight Goes (And Why You Can't Stop Googling About It)
Most of the weight is settling around your middle. "Menopause belly," people call it. The medical term is visceral fat, and (yeah, we know you've read about this at 2am and now you're worried it means you're definitely getting diabetes).
As oestrogen levels reduce, visceral fat increases from 5-8% of total body weight to 10-15%. This isn't the soft fat just under your skin. It's deeper, surrounding your organs.
That sounds terrifying. We know. But knowing about it means you can do something about it, which is why we're being straight.
Visceral fat is more metabolically active than other fat. It releases hormones and inflammatory substances that can mess with your insulin sensitivity. This is why weight around your middle is linked to higher risk of type 2 diabetes, heart disease, high blood pressure.
The not-knowing is the worst bit. So let's be clear: carrying extra weight around your waist does increase these health risks more than carrying it on your hips and thighs. But these risks can be managed. You're not on some inevitable path to illness just because your jeans don't fit.
Will It Ever Stop?
This is what you really want to know. You want to know if you're going to keep gaining weight until you're 60, 70, forever.
The weight gain is most pronounced during perimenopause and in the first few years after your final period. After that, it typically slows right down. Your body does adjust to its new hormonal baseline. Eventually.
About 60% of women are over their ideal BMI throughout perimenopause. Weight gain is extremely common. You're absolutely not alone, even though scrolling through Instagram at midnight makes it feel like you're the only one whose body's doing this.
The timeline varies wildly. Some women notice rapid changes over 2-3 years. Others experience gradual gain over longer. Perimenopause itself can last 4 to 10 years (frustrating, we know). There's no neat answer. Bodies are different. But it does stabilise.
What's Actually Happening Inside Your Body
Understanding the mechanics helps, we've noticed. Makes it feel less like your body's randomly betraying you and more like... well, it's still betraying you, but at least you know why.
Your ovaries are producing less oestrogen and progesterone. These hormones don't just control your cycle (they play a massive role in how your body handles insulin, the hormone that regulates blood sugar).
When oestrogen drops, your body can become less sensitive to insulin. Think of insulin as a key that unlocks your cells so glucose can enter and be used for energy. When you're insulin resistant, that key doesn't work properly. Your pancreas makes more insulin to compensate. High insulin levels tell your body to store fat, especially round your abdomen. Frustrating, right?
At the same time, your lean muscle mass is decreasing. Muscle is metabolically expensive (your body has to burn calories to maintain it). As you lose muscle, you need fewer calories just to exist. If you keep eating the same amount, you gain weight.
Then there's stress. Low oestrogen can trigger your body's stress response, leading to elevated cortisol levels. Your body thinks it's under threat, releases cortisol. Cortisol promotes fat storage, particularly visceral fat around your abdomen.
The not-sleeping makes everything worse. Night sweats wreck your sleep quality, and poor sleep messes with your blood sugar regulation and increases hunger hormones. It's all connected.
How to Manage It
You want to know what actually works. Not fad diets your sister-in-law swears by, not celebrity nonsense. Just what the research says.
Calorie-reducing diets combined with regular exercise (including strength training) are most effective for long-term weight management during menopause. That's not the revolutionary answer you wanted (we know), but it's what works.
Strength training matters now
You may need about 200 fewer calories a day in your 50s than you did in your 30s and 40s to maintain the same weight. That's one chocolate digestive and a small latte. Not much room for error.
Regular resistance exercise is the most efficient way to increase muscle mass and boost your metabolic rate. More muscle means more calories burned at rest. It also helps bone density (which matters for osteoporosis risk later).
You don't need a gym membership. Simple stuff (squats, press-ups against the kitchen counter, bicep curls with tins of beans if that's what you've got). Twice a week. Yoga counts. Pilates counts. They're also brilliant for stress, which helps with that cortisol problem.
Plus moving more generally. Aim for 150-200 minutes of moderate activity per week. Brisk walking. Cycling. Swimming. Whatever you'll actually do.
The eating bit
Safe, sustainable weight loss needs a daily calorie deficit of around 500 calories, combined with that exercise. Not starving yourself. Not cutting out entire food groups.
Protein matters more now. It helps you feel full, preserves muscle, supports metabolism. Chicken, fish, eggs, Greek yogurt, tofu, beans. About a quarter of your plate.
You need carbs, especially if you're exercising. Without them, you'll lose muscle, which defeats the whole point. Choose lower glycemic options (granary bread, new potatoes, basmati rice). Another quarter of your plate.
Fill half your plate with vegetables and salad. More fiber, more nutrients, less room for processed stuff.
Alcohol? It's calories you probably don't need. Almost as calorific as fat, disrupts sleep, makes you raid the crisp cupboard at 9pm. We're not saying never, but it's worth being aware.
Should We Talk About HRT?
If weight gain is bothering you and you have other menopause symptoms, yes.
HRT doesn't directly cause weight loss, but it can help redistribute fat away from your abdomen. More importantly, if HRT helps you sleep better by reducing night sweats, you'll have more energy to exercise and make healthier choices.
What to say: "I'm experiencing menopause symptoms including weight gain around my middle. I'd like to discuss whether HRT might help."
Your GP can prescribe HRT to help with menopause symptoms. Some studies suggest HRT may help preserve muscle mass and slightly reduce abdominal fat storage, though effects are modest.
You may gain weight during menopause whether you take HRT or not. HRT alone isn't a weight loss treatment. But if it helps you function better overall, that's valuable.
When to Worry
We know you've been Googling the risks (probably at 3am when you can't sleep). So let's talk about when weight gain becomes a medical concern, because the not-knowing is worse than knowing.
Significant weight gain increases risk of type 2 diabetes, heart disease, high blood pressure, stroke, certain cancers. Visceral fat is particularly linked to these because of how metabolically active it is.
But (and this is crucial) these are risks, not certainties. Things to be aware of and manage, not things to catastrophise about at 3am (though we get why you do).
See your GP if you've gained a lot of weight very quickly (more than a stone in a few months). If you have other symptoms alongside weight gain (extreme fatigue, excessive thirst, needing to pee all the time). If you have family history of diabetes or heart disease. If your waist circumference is increasing significantly (measure at your belly button; over 80cm is worth discussing). If weight gain is seriously affecting your mental health.
Your GP can check blood pressure, blood sugar, cholesterol. They can check thyroid function too, because underactive thyroid causes weight gain and is more common during menopause.
Most menopause weight gain is normal physiological change, not illness. But it's always okay to get checked if you're worried.
What We Want You to Remember
Menopause weight gain affects over half of all women. You're not doing anything wrong. Your body is adjusting to massive hormonal changes.
The weight gain does stabilise. It won't keep increasing forever.
Small changes work better than crash diets. Strength training twice weekly, moving more, eating protein with meals, managing stress. It's not revolutionary, but it works.
If weight gain is affecting your life, talk to a menopause specialist. They can check for underlying issues, discuss HRT, refer you for support.
Be kind to yourself. Your body is navigating one of the biggest hormonal shifts of your life. You deserve patience.
- British Menopause Society. Menopause: Nutrition and Weight Gain. https://thebms.org.uk/wp-content/uploads/2023/06/19-BMS-TfC-Menopause-Nutrition-and-Weight-Gain-JUNE2023-A.pdf
- NHS. Menopause - Symptoms. https://www.nhs.uk/conditions/menopause/symptoms/
- NHS Inform Scotland. After the menopause. https://www.nhsinform.scot/healthy-living/womens-health/later-years-around-50-years-and-over/menopause-and-post-menopause-health/after-the-menopause/
- Mayo Clinic. The reality of menopause weight gain. https://www.mayoclinic.org/healthy-lifestyle/womens-health/in-depth/menopause-weight-gain/art-20046058
- University of Chicago Medicine. Why am I gaining weight so fast during menopause? https://www.uchicagomedicine.org/forefront/womens-health-articles/menopause-weight-gain-hormone-therapy
- NewYork-Presbyterian. How to Prevent Menopause Weight Gain. https://healthmatters.nyp.org/how-to-prevent-menopause-weight-gain/
- Ohio State Health. Managing weight gain during menopause. https://health.osu.edu/wellness/exercise-and-nutrition/managing-weight-gain-during-menopause
- LloydsPharmacy. Menopause And Weight Gain. https://onlinedoctor.lloydspharmacy.com/uk/womens-health-advice/menopause-and-weight-gain
- Harvard Health. Why am I gaining belly fat during menopause? https://www.health.harvard.edu/womens-health/why-am-i-gaining-belly-fat-during-menopause
- Benenden Hospital. Managing high cortisol levels during menopause. https://www.benendenhospital.org.uk/health-news/womens-health/managing-high-cortisol-levels-during-menopause/
- WebMD. Cortisol Belly: Causes and Symptoms. https://www.webmd.com/diet/cortisol-belly
- GREM Journal. Metabolic syndrome, insulin resistance and menopause. https://gremjournal.com/journal/02-03-2023/metabolic-syndrome-insulin-resistance-and-menopause-the-changes-in-body-structure-and-the-therapeutic-approach/
- NHS. Side effects of hormone replacement therapy (HRT). https://www.nhs.uk/medicines/hormone-replacement-therapy-hrt/side-effects-of-hormone-replacement-therapy-hrt/
- NHS Inform Scotland. Hormone replacement therapy (HRT). https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/hormone-replacement-therapy-hrt/



