---
title: 'Understanding Weight Changes in Perimenopause'
slug: weight-changes-perimenopause-why-it-happens-what-helps
lifeStage: perimenopause
category: Nutrition
author: 'Samaira Farid'
medicalReviewer: 'Rose Constantine, Registered Nutritionist'
reviewerId: 'https://blog.bloume.com/perimenopause/medical-board.md#rose-constantine'
lastUpdated: '2026-08-13'
primarySource: 'Body composition and bone mineral density after ovarian hormone suppression with or without estradiol treatment'
wordCount: 975
readTimeInSeconds: 244
---

# Understanding Weight Changes in Perimenopause

During perimenopause, you might notice your waist thickening or your weight shifting in ways that feel unfamiliar, even when your diet has not changed. Falling oestrogen pushes fat towards your middle, and a gradual slowing of your metabolism adds to the picture. Understanding why these changes happen can help you make sense of what your body is doing. This article covers the key physiology, why restriction often makes things harder, and which foods may offer practical support.

**Q: Why is my weight shifting to my stomach during perimenopause?**
A: Changing hormone levels during perimenopause, including the overall decline in oestrogen, can alter the way your body stores fat. A greater proportion may begin to collect around your waist and abdomen, rather than mainly around your hips and thighs. This change in body shape can happen even without a large increase in your overall weight, although ageing, activity, sleep and genetics also have an influence.

You might have noticed your weight changing recently even though what you eat has not really changed. These shifts are partially due to hormonal changes during perimenopause, and understanding what sits behind them can help you work with your body. If you already live with PMOS (polyendocrine metabolic ovarian syndrome, formerly PCOS), some of this may feel familiar, though perimenopause adds its own layers.

## Why weight distribution shifts as oestrogen declines

Oestrogen is a key factor that shapes where your body stores fat. As your oestrogen levels drop during perimenopause, fat that used to sit around your hips and thighs tends to move towards your middle instead. This is the hormone change at work, and it can happen whatever your eating or activity habits look like.

Some of that fat around your middle is visceral fat, the kind stored deeper around your organs rather than just under your skin. During the menopause transition it can climb from around 5 to 8 per cent of your total body fat to around 10 to 15 per cent, though these are rough figures and the range between people is wide. Visceral fat carries more weight for your heart and metabolic health, which is why this particular shift is worth knowing about.

## How metabolic rate changes during perimenopause

Alongside this shift, the amount of energy your body uses may gradually change through midlife. This is in part due to gradual loss of lean muscle that happens with age. Muscle burns more energy at rest than fat does, so as muscle drops, your body needs fewer calories to tick over. If your eating has stayed the same, that shift alone can nudge your weight up slowly over time, so working to preserve muscle is important.

On average, weight gain of around 1.5 kg has been observed during each year of the menopause transition, though this varies a lot from person to person. If you live with PMOS, with existing insulin resistance or other metabolic features you may find these changes overlap, making them harder to distinguish from patterns you already recognise.

## Why restricting food often makes things harder

When the scales go up, it is common to want to cut calories hard. During perimenopause, that approach tends to work against you. Cutting back sharply can lead to a greater loss to lean muscle, and since muscle keeps your metabolism ticking over, losing it slows things down even more. Over time that can make your weight harder to manage.

> **INFO**: Cutting your food intake sharply can reduce muscle, which slows your metabolism further. Eating enough, with a good balance alongside weight-bearing exercise to support muscle retention, tends to support your metabolism more than strict restriction during perimenopause.

## What helps: protein, fibre, and a balanced approach

Instead of eating less overall, leaning on foods that help support muscle and feel full can make a real difference. Protein matters here. Mixing up your protein sources, beans, peas and lentils alongside other choices, can help you feel fuller for longer and helps protect your muscle at a time when it tends to slip away.

High-fibre foods like wholegrains, fruit and vegetables are a key part of a balanced diet and may help you keep your weight steady. Building your meals around enough protein and fibre gives you a steady base to work from.

## What this means if you have PMOS

If you live with PMOS, the perimenopausal shift which often impacts metabolism, insulin sensitivity and where you hold fat, can add an additional layer to the patterns you already work with. In this situation the same principles hold: enough protein and fibre, steering clear of harsh restriction, and protecting your muscle. How PMOS and perimenopause play off each other hormonally is worth raising with your GP, who can look at your own picture.

> **WARNING**: If weight changes are worrying you, or they are starting to affect your health or how you feel day to day, speak with your GP. Tailored guidance matters here, especially when you are also managing PMOS.

Weight changes during perimenopause come from real shifts in your physiology. If you want to look into this more, a GP or registered dietitian can give you guidance tailored to where you are in your transition.

**Q: Why is my weight shifting to my stomach during perimenopause?**

Changing hormone levels during perimenopause, including the overall decline in oestrogen, can alter the way your body stores fat. A greater proportion may begin to collect around your waist and abdomen, rather than mainly around your hips and thighs. This change in body shape can happen even without a large increase in your overall weight, although ageing, activity, sleep and genetics also have an influence.

**Q: Will cutting calories help me lose the weight I have gained?**

Cutting calories hard can work against you during perimenopause. Restrictive eating can lead to muscle loss, which slows your metabolism further and makes your weight harder to manage over time. A balanced approach built around enough protein, fibre and resistance exercise tends to support you more than steep calorie cutting.

**Q: Which foods are most relevant to support my body during this change?**

Mixing up your protein sources, like beans, peas, lentils and other options, can help you feel full and hold onto muscle. High-fibre foods like wholegrains, fruit and vegetables may also help you keep your weight steady as part of a balanced diet. These are general principles; for advice tailored to you, speak with your GP or a registered dietitian.

**Q: Does having PMOS affect how perimenopause changes my weight?**

The perimenopausal shift in where fat sits and your slowing metabolism can layer onto the metabolic patterns you already manage with PMOS. The broad principles around protein, fibre and avoiding harsh restriction still hold. Your GP can help you understand what this means for your own situation.

### Clinical Sources
- [Body composition and bone mineral density after ovarian hormone suppression with or without estradiol treatment](https://pubmed.ncbi.nlm.nih.gov/25783468/)
- [Changes in body composition and weight during the menopause transition](https://insight.jci.org/articles/view/124865)
- [Effect of short- and long-term protein consumption on appetite and appetite-regulating gastrointestinal hormones](https://pubmed.ncbi.nlm.nih.gov/32768415/)
- [Systematic review and meta‐analysis of protein intake to support muscle mass and function in healthy adults](https://pmc.ncbi.nlm.nih.gov/articles/PMC8978023)
- [Cereal Fibers and Satiety: A Systematic Review](https://pubmed.ncbi.nlm.nih.gov/40644449/)
- [Weight Loss Strategies and the Risk of Skeletal Muscle Mass Loss](https://www.mdpi.com/2072-6643/13/7/2473)
- [Increased visceral fat and decreased energy expenditure during the menopausal transition](https://pubmed.ncbi.nlm.nih.gov/18332882/)
- [Symptoms of menopause and perimenopause](https://www.nhs.uk/conditions/menopause-and-perimenopause/symptoms/)
- [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)
- [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)
- [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)

---
Reviewed by Rose Constantine, Registered Nutritionist| [Medical Board](https://blog.bloume.com/perimenopause/medical-board.md) | August 2026