→What is really happening →The main drivers →What the evidence supports →Eating and moving in practice →Stress and the nervous system →Where GLP-1 medications fit →When to speak to your doctor →Beyond the basics →Frequently asked questions →References

Shifting oestrogen and where fat is stored

As ovarian function changes, oestrogen levels fluctuate and then decline. One of the better-documented effects is a redistribution of body fat, moving away from the hips and thighs and toward the abdomen. This is not only about oestrogen falling. Both unusually high and unusually low oestrogen states appear able to influence insulin sensitivity (Vigil et al., 2022), which may be part of why some women notice changes early, while hormones are still fluctuating rather than settled.

Loss of muscle and the protein question

Muscle is metabolically active tissue, so losing it gradually lowers the energy the body uses at rest. Across the transition women tend to lose lean mass, and one proposed mechanism combines increased protein breakdown with a reduced ability to build muscle from dietary protein, sometimes called anabolic resistance, which also occurs with advancing age more generally (Simpson et al., 2023; Wright et al., 2024). This is one of the more actionable areas, and the strategies that help, including resistance training, adequate protein and for some women creatine, are covered below.

Changes in insulin sensitivity and abdominal fat

Visceral fat, the deeper fat stored around the abdominal organs, tends to increase across the transition. It is more metabolically active than fat under the skin, and higher amounts are associated with reduced insulin sensitivity (Kodoth et al., 2022). This is part of why central weight gain in midlife is taken seriously as a marker of metabolic and cardiovascular health, not simply a matter of appearance.

Insulin is the body’s main fat-storing hormone, and when cells become less responsive to it, insulin levels tend to run higher (Kahn & Flier, 2000). This creates a more fat-storing environment and is associated with weight being harder to shift. Protein and fibre help by steadying blood sugar and easing the demand on insulin, which may support both your metabolism and your weight.

Sleep, appetite and energy

Disrupted sleep is one of the most common features of perimenopause, and poor sleep has a well-established effect on the hormones that regulate hunger and fullness, tending to increase appetite the following day. Add fatigue that lowers the motivation to move, and the effect on overall energy balance can be meaningful even when nothing about your conscious choices has changed. If sleep is a struggle, our evidence-based guide to perimenopause sleep covers this in more depth.

Of everything in this article, building and preserving muscle has some of the most consistent support. A randomised controlled trial in postmenopausal women found that resistance training improved body composition and strength and acted as a protective strategy against muscle loss (Ioannidou et al., 2024). Because muscle loss is one of the central drivers above, training to maintain it addresses the problem closer to its source than restricting food alone. In practice that means two or three sessions a week working the major muscle groups, the legs, back, chest, shoulders, arms and core, and gradually increasing the challenge over time as it gets easier. Bodyweight movements, resistance bands, dumbbells or machines all count, and starting light and building up is not only fine, it is the point.

Given the role of anabolic resistance, adequate protein is frequently recommended to support muscle. The evidence is more nuanced than headlines suggest. In the trial above, adding a high-protein diet on top of resistance training did not produce a clear additional benefit over training alone (Ioannidou et al., 2024), and several studies suggest protein supports muscle best when training is already in place rather than acting as a stand-alone solution. The practical reading is that protein matters as a foundation, but it works alongside strength work rather than replacing it.

Because sleep influences appetite, energy and the motivation to be active, improving it can support weight goals indirectly as well as improving quality of life directly. This is rarely framed as a weight intervention, but given how tightly sleep, hunger hormones and daytime activity are linked, it is a sensible and often overlooked place to start.

None of the above replaces a broadly balanced way of eating and regular movement across the day. The shift in midlife is less about finding a new perfect diet and more about consistency with the basics while the body is changing underneath you. Crash approaches and very restrictive diets tend to backfire, partly because losing weight quickly can mean losing muscle, which is the opposite of what is helpful here.

Hormone therapy is sometimes raised in the context of body composition, and the evidence is genuinely mixed. Some research suggests oestrogen-based therapy may partly limit the shift toward abdominal fat, while its effect on muscle specifically is less clear. Hormone therapy is prescribed for menopausal symptoms rather than as a weight treatment, and any decision about it belongs with you and your doctor.

Protein, and how much

Because building and holding on to muscle gradually becomes a little harder from our forties onwards, protein matters more than it used to, and many women fall short, especially at breakfast. Protein’s role in supporting muscle is well established across adulthood. As a general guide for protecting muscle, many nutrition specialists suggest aiming a little above the basic adult reference of about 0.8 grams of protein per kilogram of body weight a day, in the region of 1.0 to 1.2 grams, with roughly 25 to 30 grams spread across each main meal to make the most of it (Bauer et al., 2013; Deutz et al., 2014). For a woman weighing around 70 kilograms, that is approximately 70 to 85 grams a day. Treat these as a sensible direction of travel rather than a precise prescription, as individual needs vary. Good sources include eggs, fish, lean meat, dairy, beans, lentils, tofu and other pulses, and adding a protein source to breakfast is often the easiest win.

Please note: if you have any kidney condition, speak to your GP or a dietitian before increasing your protein intake, as different advice applies.

Fibre and whole foods

Fibre helps with fullness, blood sugar steadiness and gut and heart health. UK guidance recommends around 30 grams a day, yet most adults manage closer to 20 grams (NHS). Vegetables, fruit, wholegrains, beans and pulses are the easiest ways to close that gap, and simple swaps such as wholegrain bread, rice or pasta in place of white versions add up over a day.

Where it is easy to overshoot

Highly processed and sugary foods are easy to eat in large amounts without feeling full, and liquid calories from alcohol and sweetened drinks add up quietly. Alcohol can also disrupt sleep, which feeds back into appetite the next day. None of this needs to be all or nothing, and small reductions in the things that are easy to overdo tend to be more sustainable than cutting them out entirely.

Movement that combines strength and activity

The NHS recommends at least 150 minutes of moderate activity a week, such as brisk walking or cycling, alongside muscle-strengthening activity on at least two days (NHS). The strength element matters most for the muscle and metabolism picture described above, while the moderate activity supports heart health and helps with overall energy balance. Everyday movement that is not formal exercise, such as walking and staying generally mobile, adds to the total and is often the easiest part to sustain.

What the evidence suggests

Moderate, with individual variation

Strength

Preserving muscle is the single most useful lever in this whole picture. If you do one thing, make it consistent resistance work that you can sustain, rather than the most intense plan you can manage for a fortnight. Some women also use creatine alongside training to support muscle, which our creatine guide covers in detail.

Protein

Spreading adequate protein across the day supports the muscle you are working to keep. Think of it as the material your strength work needs, rather than a weight-loss treatment in itself.

Sleep

Because poor sleep raises appetite and lowers daytime energy, protecting it supports your goals on more than one front. Our sleep guide covers what helps.

Daily movement

Activity that is not formal exercise, such as walking and staying generally mobile through the day, adds up and is easier to sustain than relying on workouts alone.

Self-compassion

The changes here reflect real physiology interacting with everyday life. They are not a sign of failure or a lack of willpower, and small consistent steps tend to be far more sustainable than dramatic measures.

Is weight gain inevitable in perimenopause?

It is common rather than guaranteed. The shift toward more fat and less muscle, with fat moving to the abdomen, does appear linked to the hormonal changes of the transition, but the size of the change varies a great deal between women, and the drivers behind it can be influenced. Preserving muscle and protecting sleep are two of the most useful places to focus.

Why is the weight mostly around my middle now?

As oestrogen declines, body fat tends to redistribute away from the hips and thighs and toward the abdomen, including the deeper visceral fat around the organs. This pattern is one of the more consistent findings across the transition and is why central weight gain is taken seriously for metabolic health, not just appearance.

Will eating less fix it like it used to?

Severe restriction often backfires in this stage, because losing weight quickly can mean losing muscle, and less muscle lowers the energy your body uses at rest. A more reliable approach combines adequate protein and resistance training to protect muscle, alongside a balanced overall pattern, rather than cutting calories alone.

Are GLP-1 medications suitable for perimenopausal women?

Trial data suggests they work to a broadly similar degree regardless of reproductive stage. Whether one is appropriate for you is an individual decision involving your health and history, made with a qualified prescriber. If used, preserving muscle through strength work and protein is widely seen as an important companion, since rapid weight loss can include muscle as well as fat.

Does HRT cause or prevent weight gain?

The evidence is mixed. Some research suggests oestrogen-based therapy may partly limit the shift toward abdominal fat, while its effect on muscle is less clear. Hormone therapy is prescribed for menopausal symptoms rather than weight, and any decision about it is one for you and your doctor.