Why is losing weight harder with PCOS?

Losing weight with PCOS is harder for many people, because insulin resistance, changes in appetite hormones, tiredness and sometimes medication all pile on top of each other and make hunger and cravings stronger. That means harder, not impossible. The 2023 international PCOS guideline says lifestyle is the first line of care, no single diet is "the best", and if you carry extra weight, even a 5 to 10 percent loss can help improve symptoms.

This article is for education. It doesn't replace a visit with your own doctor or their advice.

First, know this: it isn't your fault

If you've dieted many times and watched a friend get results sooner on the very same plan, you've probably told yourself, "I just have weak willpower." With PCOS, that judgment is often unfair. Your body is working in a different hormonal setting, and that setting can change your hunger, your sweet cravings and even your energy.

Another important point: not everyone with PCOS carries extra weight. Some people with PCOS are at a typical weight, and for them the main goal isn't weight loss but regular meals, movement and good sleep for metabolic and hormonal health. If you aren't sure where your weight sits, the calculator can give you a rough picture, but BMI is only a starting number and doesn't replace your doctor's judgment.

Why is weight loss harder with PCOS?

Insulin resistance

In many people with PCOS, cells respond less than usual to insulin, so the body makes more of it to compensate. High insulin makes it easier to store fat, especially around the belly, and it can nudge the ovaries to make more "male" hormones. The result is a loop: more weight increases insulin resistance, and more resistance makes losing weight harder. We cover how to keep this in mind on your plate in Insulin resistance and the PCOS plate.

Appetite hormones

Some studies suggest that in PCOS, the response of fullness and hunger hormones after a meal may differ from other people's. In other words, you may get hungry sooner after an ordinary meal, or feel full for a shorter time. These findings aren't complete or settled yet, but they match what many people describe: "It's like I never feel truly full."

Tiredness, mood and sleep

Fatigue, poor sleep and mood difficulties such as anxiety and depression are more common in PCOS. When you're tired, your body hunts for quick energy: sugary tea, sweets and white bread. Sleep apnea (pauses in breathing during sleep) is also more common in people with PCOS, especially with extra weight, and it makes sleep poorer in quality.

Medications and other conditions

Some medications, such as certain psychiatric drugs or corticosteroids, can affect appetite or weight. If you feel your weight changed after you started a medicine, don't stop it on your own; talk to your doctor. Your doctor may also check for other problems, like an underactive thyroid, which can slow weight loss.

What does the 2023 international guideline say?

The international evidence-based guideline for assessing and managing PCOS, updated in 2023, has a few clear messages:

• Lifestyle comes first: healthy eating and physical activity are recommended for everyone with PCOS, whether or not they carry extra weight.
• There is no magic diet: the evidence doesn't show that any one diet is better than the others for PCOS. The right diet is the one that is practical, healthy and sustainable for you.
• Small losses count too: for people with extra weight, losing 5 to 10 percent over about six months can improve clinical signs and metabolic markers.
• No stigma: the guideline stresses that weight should be discussed respectfully and without blame, with attention to mental health and body image.

To make 5 to 10 percent concrete: if you weigh 85 kg, that is roughly 4 to 8 kg. It's a far more realistic goal than reaching an "ideal" weight in two months.

The first goal in PCOS is to feel better and improve your symptoms, not to hit a particular number on the scale. Even a few kilos lost and kept off can make a real difference.

A realistic plan

A simple plate, with nothing banned

You don't have to give up bread and rice. Just arrange your plate like this:

1. Half the plate vegetables: Shirazi salad (diced cucumber, tomato and onion), fresh herbs and raw greens (sabzi khordan), cooked vegetables or borani-e esfenaj (spinach and yogurt dip).
2. A quarter protein: chicken, fish, eggs, lean meat, lentils and beans.
3. A quarter carbohydrates: for example one to two serving spoons (kafgir) of rice, or a palm-sized piece of sangak (whole-wheat flatbread).

For instance, instead of a plate piled with rice and a little gheymeh (split pea and meat stew), fill half the plate with salad, serve the stew with enough meat and split peas, and bring the rice down to one serving spoon.

Regular meals

Skipping breakfast and lunch and then eating a huge dinner is one of the most common patterns. Swings in blood sugar and strong hunger in the late afternoon usually end in overeating at night. Three main meals and, if needed, a light snack, like a glass of yogurt or a piece of fruit with a few walnuts, make things easier.

Protein at breakfast

A purely sweet breakfast, like bread with butter and jam, or tea with dates, leaves you hungry again quickly. Adding protein helps you get through to lunch more comfortably:

• A fried or boiled egg with whole-grain bread, tomato and cucumber
• Cheese and walnuts with sangak and fresh herbs
• Greek or regular yogurt with a little fruit

Movement, as much as you can manage

The World Health Organization recommends that adults get at least 150 minutes of moderate activity a week, for example 30 minutes of brisk walking on five days. If you're barely active now, start with 10 minutes after dinner. Strength training twice a week, even with just your body weight, helps preserve muscle and improve insulin sensitivity. We have more practical ideas in Walking and sleep in PCOS.

Take sleep seriously

Adults usually need at least 7 hours of sleep a night. Short sleep increases hunger and sweet cravings the next day. If you snore loudly, or feel tired in the morning despite enough sleep, tell your doctor.

Count the wins beyond the scale

With PCOS, the scale may not move for weeks even while your body is getting healthier. Write these signs down too:

• Looser clothes or a smaller waist measurement
• More energy and less drowsiness after lunch
• Fewer sweet cravings
• More regular periods
• Better mood and confidence

The scale is not the only measure

What to track	How often	Why it matters
Weight	Once a week, on the same day	Shows the trend, not daily ups and downs
Waist measurement	Once a month	Linked to belly fat and metabolic risk
Energy and sleep	Every day, in one sentence	Usually the first things to improve
Periods	Every month	One sign that hormonal balance is improving
Sweet cravings	Every day	Shows whether your meals and sleep are set up well

Parties, late-night gatherings and Ramadan

You don't need to avoid parties. Have a light snack before you go so you don't arrive starving, start with salad and the main dish, and eat dessert after the meal, one or two pieces, not on an empty stomach. During Ramadan, don't skip sahari (the pre-dawn meal), and at iftar (the evening meal that breaks the fast), instead of filling your plate with zoolbia and bamieh (fried syrup sweets), start with water, a small number of dates, lentil soup or ash (thick herb and noodle soup), and then a balanced meal. If you take medication, check with your doctor before fasting.

When should you talk to a doctor?

Food and movement are the foundation, but sometimes they aren't enough. Decisions about medication, for example metformin or other drugs used for weight loss or to regulate periods, are for your doctor only. Don't start any medicine or supplement on your own or on the advice of a friend or social media. These situations are worth a visit:

• You haven't had a period for several months, or your bleeding is very heavy
• After several months of steady effort, you've seen no change in weight, waist or energy
• You have heavy snoring, daytime sleepiness or constant fatigue
• You're planning a pregnancy
• Your relationship with food has become distressing, for example episodes of binge eating that feel out of control

To learn more about the condition itself, you can visit the PCOS page.

Summary

Losing weight with PCOS really is harder, and that has nothing to do with weak willpower. But reliable guidelines are clear that lifestyle comes first, there is no miracle diet, and a moderate, lasting weight loss can improve symptoms. A balanced plate, regular meals, protein at breakfast, daily movement and enough sleep are the pillars of this path. Be patient, and don't measure progress by the scale alone.

If you'd like a plan that fits you, at Rejimist a doctor writes your personal diet from your questionnaire and stays with you through a short daily check-in by text message. You can begin at start your diet.

Sources

• Teede HJ, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Journal of Clinical Endocrinology & Metabolism, 2023.
• Moran LJ, et al. Lifestyle changes in women with polycystic ovary syndrome. Cochrane Database of Systematic Reviews, 2011.
• World Health Organization (WHO). Guidelines on Physical Activity and Sedentary Behaviour, 2020.
• Watson NF, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep, 2015.
• Escobar-Morreale HF. Polycystic ovary syndrome: definition, aetiology, diagnosis and treatment. Nature Reviews Endocrinology, 2018.