Obesity in women: risks, life stages and how to lose weight

What does obesity in women mean?

Obesity in women is the same chronic disease as in men: the body carries so much fat, or stores it in such harmful places, that health is affected or likely to be.

For adults, doctors usually start to speak of obesity at a body mass index (BMI) of 30 or higher. You can read the full definition on our page about what obesity is.

What makes obesity in women worth its own page is everything around that definition. Women go through hormonal shifts that men never experience: periods, pregnancy, breastfeeding and menopause. Each of them can change appetite, fat storage and energy, and each brings its own questions.

Women also face weight judgement earlier and more often than men, at work, in relationships and in the doctor’s office. That pressure makes it harder, not easier, to seek help. This page brings the women-specific facts together and points you to our in-depth guides for each life stage.

This page gives general information, not personal medical advice. Talk to your doctor first before you change your eating, start a new exercise routine or stop any medicine, especially if you are pregnant, trying to conceive, breastfeeding or living with a long-term condition.

How common is obesity in women? The latest figures

Obesity is more common in women than in men in most of the world. The latest global estimates from WHO, based on the work of the NCD Risk Factor Collaboration (NCD-RisC), put adult obesity at 18.4 percent among women and 13.8 percent among men. That is roughly 1 in 5 women, compared with about 1 in 7 men.

In about four out of five countries, the share of women with obesity is higher than the share of men. The exceptions are mostly in Europe and East Asia, plus a few countries such as Canada and Australia, where men are slightly more often affected.

The gap between the sexes is striking in some countries.

In Egypt, more than half of adult women live with obesity, almost twice the rate in men. In South Africa the rate in women is about three times that in men. In Japan and China, by contrast, obesity is more common in men.

The trend matters as much as the level. A large NCD-RisC analysis in Nature found that obesity was still rising clearly, by more than half a percentage point a year, among women in 100 countries, against 66 countries for men.

In South and Southeast Asia, the Caribbean and most of sub-Saharan Africa, obesity is now rising faster in women than in men.

There is some hopeful news too. In several high-income countries the rise has slowed or levelled off, and in a few, such as France for women, obesity has even started to fall slightly. Figures for every country, including men and children, are on our page on obesity by country.

For the figures in men and what helps them lose weight, see our sister guide on weight loss for men.

Why are women more often affected by obesity?

There is no single reason. Women’s biology, the big hormonal life events, everyday living conditions and the way society treats women’s bodies all add up. Researchers who study sex differences in obesity stress that biological and social factors act together, so blaming one thing, or blaming the woman herself, misses the picture.

Biology and hormones

Women naturally carry more body fat than men at the same weight, and they tend to store it under the skin, around the hips and thighs. Oestrogen helps steer where that fat goes and also plays a part in appetite. Across the menstrual cycle, appetite often rises in the days before a period.

When oestrogen falls at menopause, energy use and fat burning drop a little and fat starts to collect around the waist instead. This shift explains why many women notice a change in body shape in their late forties and fifties, even without eating more. For the wider picture of genes and appetite signals, see our page on what causes obesity.

PCOS

Polycystic ovary syndrome (PCOS) is one of the most common hormone conditions in women of childbearing age. It is linked to insulin resistance, which makes weight gain easier and weight loss slower. A large meta-analysis found that women with PCOS were nearly three times as likely to have obesity as women without it.

Pregnancy and the years after

Some weight gain in pregnancy is healthy and needed. But many women gain more than advised, and part of that weight often stays after the birth. With each pregnancy, a few kilos can add up over the years, especially when sleep is short and time for meals and movement is scarce.

Menopause

The years around menopause bring hot flushes, broken sleep, mood changes and a natural loss of muscle. Together these can lead to slow weight gain, especially around the belly. Ageing itself plays a part as well, so it is not only hormones.

Medicines

Several medicines that women often take can add weight, such as some antidepressants, antipsychotics, steroid tablets and certain diabetes or epilepsy medicines.

Never stop a medicine on your own. Ask your doctor whether a weight-neutral option exists. Our page on medication and weight gain lists the main groups.

Caregiving, work and stress

In many families women still do most of the caring, for children, partners or older parents, often on top of paid work. Time for cooking, walking or exercise is the first thing to disappear. Short nights and constant stress raise appetite for quick, energy-dense food, a pattern we describe in sleep, stress and mental health.

Food environment and poverty

Cheap, heavily marketed, ultra-processed food is everywhere, and the food environment shapes what ends up on the plate far more than personal choice. Money matters too. A systematic review of low and middle-income countries found that, as countries grow richer, obesity shifts towards women with less income and education.

In some places, there are also fewer safe spaces for women to walk or exercise, and cultural norms may limit sport for girls and women. A larger body is valued as a sign of health or wealth in some communities, which can make weight a sensitive topic within families.

Weight stigma

Women are judged on their bodies more harshly than men. A large US survey found that women reported weight discrimination about twice as often as men.

Women with a BMI between 30 and 35 were three times more likely than men of similar weight to report it. Shame and stress do not help anyone lose weight; they make comfort eating and avoiding care more likely.

Health risks of obesity for women

Obesity raises the risk of many conditions in everyone, including type 2 diabetes, high blood pressure, heart disease, fatty liver and sleep apnoea. Our page on health risks of obesity explains each of them. Below we focus on the risks that are specific to women, or that affect women more often.

A higher risk is not a prediction. Many women living with obesity never develop these conditions, and many of these risks fall again with modest weight loss.

Fertility

Obesity can disturb the hormone balance that controls ovulation, so cycles become irregular or eggs are released less often. It can also make fertility treatment less likely to work. A review of 40 studies found that women who followed a diet or exercise programme were more likely to become pregnant than women in control groups.

Pregnancy complications

Obesity in pregnancy is linked to more gestational diabetes, high blood pressure, pre-eclampsia and caesarean births. A meta-analysis of 20 studies found that the odds of gestational diabetes were about 3.6 times higher with obesity, and about 8.6 times higher with severe obesity. Your midwife or doctor can plan extra checks so problems are found early.

Cancer of the womb, ovary and breast

The International Agency for Research on Cancer (IARC) has concluded that excess body fat raises the risk of several cancers that only or mainly affect women. For womb cancer, the risk rises steeply with weight: the IARC review reported a relative risk of about 7 in the highest obesity class.

For breast cancer, the picture is different before and after menopause. After menopause, a higher BMI is linked to a modestly higher risk. Before menopause, studies have consistently found the opposite.

There are early signs that intentional weight loss may lower the risk of breast and womb cancer, but this is not yet proven.

Whatever your size, keep going to breast and cervical screening when you are invited. If an exam room or equipment does not fit you, say so; it is the service’s job to adapt.

Urinary incontinence

Extra weight presses on the bladder and the pelvic floor muscles, so leaks during coughing, sneezing or exercise are more common. This can make women avoid walking or exercise, which is a hard cycle to break.

In a trial with 338 women, those who lost an average of 8 percent of their weight had 47 percent fewer leaks a week after six months.

Pelvic floor exercises also help, and a physiotherapist can teach them. Leaking urine is common and treatable, so it is worth mentioning to your doctor.

Joint pain

Knee and hip pain are among the most common reasons women give for not moving more. In the long-running Framingham study, women who lost about 5 kg over ten years halved their chance of developing painful knee osteoarthritis. Gentle, low-impact movement is possible even with sore joints, as our programme Level Start shows.

Obesity in women at each life stage

A woman’s weight story often follows her life stages. Each stage brings its own causes, risks and practical options. Below is a short overview, with a link to our detailed guide for each one, so you can go straight to what matters for you now.

Teenage years, periods and PCOS

Puberty brings a natural increase in body fat, and with it, often, the first experience of body dissatisfaction. Irregular or absent periods, acne and extra hair growth can be signs of PCOS, which deserves a proper check by a doctor.

For practical steps on eating, exercise and what to ask your doctor, see our guide to PCOS weight loss.

Trying to conceive and pregnancy

The months before pregnancy are the best moment to improve health, because many risks start early. A preconception visit with your doctor can cover folic acid, blood pressure, blood sugar and medicines. During pregnancy itself, the goal is healthy weight gain, not weight loss.

Our page on obesity and pregnancy explains the risks, recommended weight gain and the extra care you can expect.

After the birth

The first year after birth is about recovery, feeding and sleep, often in that order. Gradual weight loss is possible, also while breastfeeding, once your body has healed and your doctor or midwife agrees.

Read our gentle guide to postpartum weight loss for a realistic timeline and plan. If you had gestational diabetes, ask about a follow-up blood sugar test.

Perimenopause and menopause

From the mid-forties, many women notice weight moving to the waist, more tiredness and less muscle. Strength exercise, protein at each meal and better sleep become even more important.

Our guide to menopause weight gain explains what happens and offers a 12-week plan for women over 40.

Later life

After 65, the focus shifts from the number on the scale to staying strong, mobile and independent. Losing muscle and bone is a bigger threat than a few extra kilos. Any weight loss at this age should be slow, protein-rich and combined with strength exercise, under a doctor’s guidance.

How women can lose weight: what helps

The basics that help women lose weight and stay healthier are good food, daily walking, strength exercise, sleep and support. They work at every life stage, as long as you adjust them to your body, your health and your daily routine.

Talk to your doctor first, especially if you have diabetes, high blood pressure, joint problems, take medicines or are pregnant.

A realistic first goal is to lose 5 to 10 percent of your current weight over several months. For a woman weighing 100 kg, that is 5 to 10 kg. This amount already improves blood sugar, blood pressure, fertility, bladder control and knee pain for many women.

Good food, without crash diets

Build most meals around vegetables, fruit, whole grains, pulses and a good source of protein such as fish, eggs, yoghurt, beans or lean meat. Drink water instead of sugary drinks, and keep ultra-processed snacks for occasional use rather than daily habits.

Very strict diets often backfire: they cost muscle, worsen mood and usually end in regain. Women who are pregnant or breastfeeding have higher needs and should not cut calories sharply. Our free 7-day eating plan shows what balanced days look like.

Walking every day

Walking is free, safe for most bodies and easy to fit around school runs, shopping or a lunch break. Start where you are, even with 10 minutes, and add a few minutes each week. A pram, a dog or a friend can make it part of the routine.

International guidelines advise adults to aim for 150 to 300 minutes of moderate activity a week, and they include specific advice for pregnancy and the period after birth. Any amount is better than none. Our walking plan for beginners takes you there step by step.

Strength exercise for muscles and bones

Women lose bone faster after menopause, and muscle declines with age, which raises the risk of falls and fractures. Strength exercise slows both. It also helps the body use blood sugar better and protects muscle while you lose fat.

In a trial with postmenopausal women with low bone density, a supervised high-intensity strength and impact programme twice a week improved bone density in the spine and hip, and made everyday tasks easier. You do not need a gym: chair squats, wall push-ups and resistance bands are a good start. See our strength training plan for beginners.

Sleep

Short or broken sleep raises hunger and cravings the next day and saps the energy to move. Night feeds, young children, shift work and hot flushes all get in the way. Small steps help: a regular bedtime, a cool bedroom, less screen time late at night and asking for help with night duties where possible.

Support and emotional eating

Many women eat to cope with stress, tiredness or loneliness, especially when they look after everyone except themselves. That is human, not a failure. Our page on emotional eating explains how to spot the pattern and what to do instead.

Support from a partner, a friend, a group or a professional makes change easier to keep up. If you have frequent episodes of eating large amounts while feeling out of control, talk to your doctor, because binge eating disorder needs its own treatment.

Some women ask their doctor about weight-loss medicines or surgery. Many medicines are not suitable during pregnancy, while trying to conceive or while breastfeeding, so always tell your doctor about any pregnancy plans.

Whether medication is right for you is something to discuss with your doctor. Obesity Foundation does not recommend or promote weight-loss medication; our focus is good food, appropriate exercise and walking.

A gentle first month: where to start

Changing everything at once rarely lasts. This four-week start builds one habit at a time, so it fits around work, children and caring duties. Talk to your doctor first, and slow down if anything causes pain or dizziness.

After four weeks, look back at what worked and keep it. Measure progress not only on the scale but also by energy, sleep, pain, mood and how your clothes fit.

Weight stigma in healthcare: what women experience

Many women living with obesity have left a doctor’s office feeling judged rather than helped. Research shows that negative attitudes about weight are common among healthcare staff and can affect how carefully patients are examined, how much time they get and what is offered to them. Our page on weight stigma explains the wider problem.

The consequences are real. A review in Obesity Reviews found that expecting poor treatment can lead patients to avoid care and to trust their doctor less. Women with severe obesity are less likely to have had a recent mammogram, which may partly explain worse breast cancer outcomes.

Common experiences that women describe include:

• every complaint, from a sore knee to a missed period, being put down to weight without proper investigation;
• being told to “just lose weight” without any concrete help or referral;
• gowns, blood pressure cuffs, chairs or scales that do not fit;
• being weighed in front of others, or without being asked;
• comments about weight during pregnancy check-ups or fertility appointments.

None of this is acceptable, and none of it is your fault. You deserve the same careful attention as anyone else. More on what good care looks like is on our page about stigma in healthcare.

How to prepare for a doctor visit

A little preparation helps you get more out of a short appointment and makes it easier to steer the conversation. Write things down beforehand, bring a friend if you like, and remember that you can ask questions too.

Questions that are especially useful for women:

• Could my irregular periods, acne or extra hair growth be PCOS, and can we test for it?
• Could any of my medicines, including contraception, be affecting my weight or appetite?
• I want to get pregnant in the next year or two. What should I do now to prepare?
• Should my blood sugar, blood pressure, cholesterol and thyroid be checked?
• Am I due for breast or cervical screening, and can the equipment be adapted if needed?
• I leak urine when I cough or exercise. Can I see a pelvic floor physiotherapist?
• Is there a dietitian, lifestyle programme or psychologist I can be referred to?

You may ask not to be weighed, or to have your weight recorded without being told, unless it is needed for a medical decision such as a medicine dose. Our full doctor visit checklist covers what to bring, which tests to expect and what to do if the conversation goes badly.

Free help for women who want to lose weight

Obesity Foundation helps women lose weight and feel healthier with good food, suitable exercise and walking. Everything we offer is free, and there is no product to buy.

• A free eating plan with tasty, everyday meals, adapted to your taste. Request your free eating plan.
• 150 free workout videos in three levels. Level Start is made for women living with obesity or joint pain: partly seated, no jumping, a chair always within reach. Get the workout videos or browse our free workouts.
• A free video meeting (in English) to talk about your situation, life stage and questions with our team. Book a video meeting.
• The free Obesity Foundation Club, with your plan, videos and progress in one place. Join the Club.

We are not doctors, and our advice is general. Before you start a new eating plan or exercise routine, talk to your doctor first, especially during pregnancy, after a birth or with a health condition.