Perimenopause & hormones
Perimenopause weight gain: why the belly changes
Same food, same routines, and still your jeans fit differently around the waist. Here is what research says about weight and body shape in perimenopause, and what is worth looking at.
Weight gain during perimenopause is common, and it often settles around the stomach and upper body [1]. Research suggests that the transition itself doesn’t make you gain weight much faster than before, but it does change your body composition: fat increases faster and muscle decreases, and more fat is stored around the waist [2][3]. Age, muscle loss, sleep and daily habits all play a part as well [4].
Many people tell me the same thing at their first visit: “I haven’t changed anything, and my body has changed anyway.” That’s not imagined. Below I go through what happens, what is worth checking, and how I work with it.
Is it the hormones, or is it age?
Both, but in different ways.
A large US study followed women over many years and measured their body composition with body scans [2]. Weight went up steadily in the years before perimenopause, and the pace didn’t speed up when the transition started. What did change was what that weight was made of. At the start of the transition, the rate of fat gain doubled and lean mass (mostly muscle) began to decline. Both trends continued until about two years after the last period [2].
A review in the journal Climacteric came to a similar conclusion. Weight gain itself can’t be put down to the menopause transition, but the hormonal changes are linked to more body fat overall and more fat around the abdomen [3].
So if the scale shows roughly the same as last year, but your waist is bigger and you feel softer and weaker, that fits with what the research describes.
Why the belly in particular?
Estrogen affects where your body stores fat. When levels drop, fat tends to be stored around the waist rather than on the hips and thighs [4]. The NHS also describes weight gain in perimenopause and menopause as often happening around the stomach and upper body [1].
Age adds to this. On average, women between 45 and 55 gain around half a kilo a year [4]. We also lose muscle mass as we get older, which slows our metabolism [4].
One thing worth separating: a belly that feels bigger can also be bloating. Bloating usually changes during the day and is often linked to food, stress and digestion. Fat around the waist stays the same from morning to evening. If you recognize the first one more, I’ve written about bloating in perimenopause.
Sleep, stress and appetite
Perimenopause often brings poorer sleep, night sweats and early waking. Poor sleep is associated with eating more and choosing different foods than you otherwise would [4]. When you’re tired, it’s also harder to find energy for exercise.
This is one reason I rarely look at weight on its own. When sleep improves, many other things become easier to work with. If sleep is your biggest struggle right now, read more about sleep and fatigue.
Other things worth checking
Weight gain and tiredness aren’t always about perimenopause. An underactive thyroid, for example, can cause both, and the most common cause in the UK usually starts in women between 30 and 50 [7]. Since these symptoms can look a lot like perimenopause, a simple blood test at your vårdcentral (local primary care clinic) can be a good place to start.
When I look at lab tests with clients, we can include things like thyroid function, nutrient levels and signs of anemia, alongside the conventional tests your doctor has already done. Sometimes we add functional testing through a private lab. The results become a basis for your plan and for conversations with your doctor.
What tends to help
There is no quick fix here. The NHS advice for perimenopause and menopause is fairly simple [5]:
- regular exercise, with a focus on weight-bearing and strength exercises
- a healthy, balanced diet with plenty of fruit, vegetables and sources of calcium
- regular sleep routines and enough rest
- keeping alcohol within the recommended limits
General guidelines for adults are at least 150 minutes of moderate activity a week, plus muscle-strengthening activities on at least two days a week [6]. In this phase, I’d put extra emphasis on the strength part, since muscle is what the transition tends to take away [2].
Crash diets are not recommended [4]. They can cost you muscle, which is the opposite of what your body needs right now.
With or without HRT
The review mentioned above found strong evidence that estrogen therapy may partly prevent the shift of fat toward the belly, though the authors note more research is needed to know who benefits most [3]. Whether HRT is right for you is a conversation for you and your doctor. I work in parallel with your doctor, whether or not you take hormones.
How I work with weight changes in perimenopause
I don’t promise weight loss, and I don’t put people on strict diets. What I do is try to understand why your body is changing right now, and which parts of that we can work with.
Your first visit is 60 minutes, 3,500 SEK, at Kommendörsgatan in Östermalm or online, in English or Swedish. We go through sleep, stress, cycle, food, digestion and movement, and what you’ve already tried. Afterward, you get a written plan. Depending on what we find, it can include advice on food and sleep, herbs, supplements and acupuncture, mainly Japanese style.
The research I’ve cited here is about hormones, age and lifestyle. It doesn’t test herbs or acupuncture for weight, so I won’t claim they change your weight. In my practice, they are part of supporting sleep, stress and other perimenopause symptoms, which often matter for how you feel in your body.
You’ll find follow-up visits and sets on prices, and more about this phase on my perimenopause page. Not sure where to start? You can book a free 15-minute call on Tuesdays, or send me an email.
When to see a doctor
Contact your vårdcentral or 1177 (Sweden’s public health information service) if you have:
- weight gain that is fast or that you can’t explain
- weight gain together with feeling extremely tired, feeling cold or other new symptoms
- swelling in your legs or belly
- bleeding after your periods have stopped, or very heavy bleeding
- low mood that doesn’t lift
In an emergency, call 112.
Sources
- NHS. Symptoms: Menopause. https://www.nhs.uk/conditions/menopause/symptoms/
- Greendale GA, et al. Changes in body composition and weight during the menopause transition. JCI Insight. 2019;4(5):e124865. https://insight.jci.org/articles/view/124865
- Davis SR, Castelo-Branco C, Chedraui P, et al. Understanding weight gain at menopause. Climacteric. 2012;15(5):419-429. https://eprints.gla.ac.uk/73536
- Better Health Channel, State of Victoria (Department of Health and Jean Hailes for Women’s Health). Menopause and weight gain. 2024. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/menopause-and-weight-gain
- NHS. Things you can do to help menopause and perimenopause symptoms. https://www.nhs.uk/conditions/menopause/things-you-can-do/
- NHS. Physical activity guidelines for adults aged 19 to 64. https://www.nhs.uk/live-well/exercise/physical-activity-guidelines-for-adults-aged-19-to-64/
- NHS. Symptoms: Underactive thyroid (hypothyroidism). https://www.nhs.uk/conditions/underactive-thyroid-hypothyroidism/symptoms/
Common questions
Does perimenopause cause weight gain?
Research suggests the transition itself doesn't speed up weight gain much. Women tend to gain weight slowly through their 40s and 50s whether or not they are in perimenopause. What does change around the transition is body composition: fat tends to increase faster and muscle tends to decrease, and more of the fat is stored around the waist.
Why is my belly getting bigger in perimenopause?
Lower estrogen levels can make your body store more fat around your waist instead of on your hips and thighs. So your weight on the scale can stay fairly similar while your shape changes. A bigger belly can also be bloating, which comes and goes during the day. It helps to notice which one you're dealing with.
Will HRT help with perimenopause weight gain?
A review of the research found strong evidence that estrogen therapy may partly prevent the shift of fat toward the belly, though more research is needed on who benefits most. Whether HRT is right for you is a decision you make with your doctor. I work in parallel with your doctor, whether or not you take HRT.
Can you help me lose weight in perimenopause?
I don't promise weight loss. What I do is look at the whole picture with you: sleep, stress, food, movement, digestion and lab tests where needed. Many things that affect weight in this phase are connected, and we build a plan you can actually live with. Your doctor stays part of it.
Want to know how I can help?
Book your first visit with me in Östermalm, or start with a free 15-minute call.