Search for "PCOS diet" and you find a dozen plans that contradict each other: cut carbohydrates, cut dairy, cut gluten, go keto. The evidence is calmer than any of them. PCOS is not one condition — it shows up differently in different people — and there is no single PCOS diet. The 2023 international guideline, developed by clinicians in partnership with people who have PCOS, found no evidence that any one diet composition beats another for weight, metabolic, hormonal, reproductive or psychological outcomes. What it recommends is the same healthy eating as for anyone, made sustainable and tailored to you, with attention to insulin.
This page is a starting point, not a prescription. A doctor or registered dietitian who knows your history can turn the pattern below into something that fits your life.
Why food matters more with PCOS
The guideline puts PCOS at between 10 and 13% of women worldwide. Its cause is not fully understood, but two things are consistently involved: higher levels of androgens (hormones such as testosterone) and, in many people, insulin resistance — which the guideline calls a pathophysiological factor in PCOS.
Insulin resistance means the body's cells stop responding well to insulin. Glucose stays higher in the blood, so the body makes more insulin to compensate. Higher insulin is one of the factors linked to higher androgens, and higher androgens are what stop the ovaries releasing an egg each month and drive the excess hair growth and acne many people with PCOS know well. PCOS also raises the long-term risk of type 2 diabetes and cardiovascular disease — the NHS lists both among its complications, and recommends regular check-ups.
That chain — food, glucose, insulin, androgens, symptoms — is why what you eat matters more with PCOS than for someone without it, and why the lever is insulin rather than any particular "bad" food. There is more in insulin resistance and PCOS. You do not need a lab number to act on it: the guideline says clinic insulin tests are of limited use and not recommended in routine care.
The pattern that has evidence behind it
The guideline recommends lifestyle change — healthy eating, physical activity, or both — for everyone with PCOS, to improve metabolic health, quality of life and body composition. On what to eat, it is blunt: no diet composition has been shown to be better than another for PCOS. Any way of eating that matches general healthy-eating guidance will have benefits, the version that works is the one you can keep up, and unduly restrictive or unbalanced diets are explicitly warned against.
So the pattern is the ordinary one, done consistently. The NHS Eatwell Guide describes it:
- Vegetables and fruit at most meals — at least five portions a day, fresh, frozen or tinned.
- Higher-fibre, slower carbohydrates rather than cutting carbohydrate out — wholegrain bread and pasta, brown rice, oats, potatoes with the skin on. They carry more fibre than white versions and keep you fuller for longer.
- Some protein with each meal — beans, lentils, fish, eggs, meat, tofu or dairy.
- Unsaturated fats in small amounts — olive or rapeseed oil, nuts, seeds, oily fish.
- Foods high in sugar, salt and saturated fat less often and in smaller amounts.
Two habits make this easier to keep. Build each plate around protein, vegetables and a slower carbohydrate rather than a carbohydrate on its own, and eat at fairly regular times so you are not skipping, getting very hungry, and then eating whatever is nearest.
For the carbohydrate side in more depth, see low-GI foods. If you have read that PCOS is inflammatory, anti-inflammatory eating covers what that involves — and where the evidence runs out.
In the app: PCOS Pal scores each food on its protein share, carbohydrate share and, where known, glycaemic index — the insulin side of this page — and rotates a seven-day set of meals built on the pattern above. Scan a barcode and the score appears before you buy.
What a day can look like
Breakfast — Greek yoghurt with oats, berries and a spoon of seeds; or eggs on wholegrain toast with tomatoes. Both pair protein with fibre, which is the point. More options in PCOS breakfast ideas.
Lunch — a lentil soup with wholegrain bread; or a salad with chicken, chickpeas or tofu, olive oil, and brown rice or a wholemeal wrap on the side.
Dinner — grilled fish or chicken, or a chickpea curry, with plenty of vegetables and a modest portion of potatoes, rice or pasta.
Snacks, if you want them — fruit with a handful of nuts, hummus with vegetable sticks, cheese with an oatcake.
Nothing here is exotic or expensive, and none of it gives up a food group. If you would rather have the week planned out, a 7-day PCOS meal plan does that.
Foods worth limiting — not banning
The all-or-nothing framing around PCOS is not in the evidence. The guideline says to tailor eating to your preferences and steer away from restrictive diets; the NHS line on foods high in sugar, salt and saturated fat is "less often and in small amounts", not never. Three things are worth limiting because they deliver sugar quickly with little else alongside it:
- Sugary drinks — fizzy drinks, energy drinks, sweetened coffees, and large fruit juices. The NHS counts juice as one portion a day at most, because of the sugar.
- Refined carbohydrate on its own — white bread, pastries or sweets eaten alone rather than as part of a meal with protein and fibre.
- Ultra-processed snacks — the ones designed to be eaten in one sitting.
"Limiting" means less often, in smaller amounts, and ideally alongside a meal rather than instead of one. No food is forbidden, and having one is not a failure. A longer list, with the reasoning, is in foods to limit with PCOS.
Weight, without the shame
A lot of PCOS advice starts and ends with "lose weight". The guideline is more careful, in two ways.
First, it says there are benefits to a healthy lifestyle even without weight loss. For people at a higher weight, weight management can bring real improvements, and the priority it names is a lifelong focus on preventing further gain rather than chasing a number; for people who are not overweight, the focus is simply healthy habits.
Second, it states that many people with PCOS experience weight stigma in healthcare and elsewhere, that the harm is real, and that clinicians should be aware of their own weight bias. If you have left an appointment feeling judged, that was not a standard you were supposed to meet.
Behaviour is what you control: what is on the plate, how regularly you eat, how much you move. Weight is a lagging, noisy indicator of them, not the goal.
What about supplements and "PCOS-friendly" products?
The supplement with the most evidence is inositol. The guideline says it could be considered, noting limited harm and some potential to improve metabolic measures — but limited clinical benefit for ovulation, hair growth or weight, with metformin preferred over it for hair growth and central weight. It cannot recommend a specific type or dose, and asks anyone taking inositol or another complementary therapy to tell their doctor.
Most products marketed as "PCOS-friendly" — teas, gummies, powders, supplement stacks — have no evidence behind them. A claim to balance your hormones or cure PCOS is the reason to be sceptical. Talk to a clinician before adding anything, especially if you take other medication or are trying to conceive.
When to see someone
Eating well helps, and it is not a substitute for care. The NHS advises seeing a GP if you think you might have PCOS or symptoms are affecting daily life — sooner rather than later if:
- your periods are very irregular, very heavy, or have stopped;
- you have signs of high androgens — new or worsening facial or body hair, acne that does not settle, thinning hair on your head;
- your weight is changing quickly;
- you are planning a pregnancy, or have been trying for a while.
PCOS can be diagnosed and treated, and the treatments — the combined pill, metformin, fertility medicines — work alongside food, not instead of it. Diet is the part you can start today.
Sources
- Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS (Human Reproduction, full text at PMC)
- NHS — Polyendocrine metabolic ovarian syndrome (PMOS), previously called PCOS
- ACOG — Polycystic ovary syndrome (PCOS), frequently asked questions
- NHS — Eating a balanced diet (the Eatwell Guide)
This article is for education. It is not medical advice, diagnosis or treatment — talk to a clinician about your own care.
More in this series
- Anti-inflammatory eating for PCOS: what is real — Where "anti-inflammatory" and PCOS actually meet, which foods the evidence supports, which only marketing does, and how it overlaps with insulin advice.
- Foods to limit with PCOS, and why banning them backfires — The foods worth eating less often with PCOS, the evidence for each, and why "limit" beats "never" for a diet you can keep.
- Insulin resistance and PCOS, explained — What insulin resistance is, why it is so common in PCOS, how it is actually tested, and what food, movement, sleep and medication each do about it.
- Low-GI foods for PCOS: a practical list — What the glycaemic index does and does not tell you, which carbohydrates rank low, how protein and fat change the picture, and where GI stops helping.
- PCOS breakfast ideas that hold you until lunch — Why breakfast is where PCOS eating plans break, the protein-fibre-fat template that fixes it, ten breakfasts that use it, and what to do about coffee.
- A 7-day PCOS meal plan you can actually keep — Seven days of ordinary meals built on the pattern the evidence supports, with a shopping list and swaps, and no food group cut out.