PMOS (PCOS) Diet: What the Evidence Says (and What to Skip)

There is no single PMOS (formerly PCOS) diet. The 2023 International Evidence-based PCOS Guideline, led from Australia, found no evidence that any one type of diet works better than another. What it does recommend is healthy eating in line with general dietary guidelines, regular physical activity, and avoiding diets that are overly restrictive. This guide explains what that means in practice, what the research says about low GI, Mediterranean, low-carb, keto, dairy-free, gluten-free and intermittent fasting, and which foods you do not need to fear.

PCOS or PMOS? A quick note on the name

In May 2026 an international consensus published in The Lancet renamed polycystic ovary syndrome as polyendocrine metabolic ovarian syndrome (PMOS), with a three-year transition to the new name. The new name points to what matters for food: PMOS is a whole-body hormonal and metabolic condition, not a problem of ovarian cysts. Most people still search for “PCOS”, so we use both names here. Read more in why PCOS is now called PMOS.

The guideline puts PMOS at 10 to 13% of women worldwide, and Jean Hailes says it affects about 1 in 8 women. If you are still working out whether you have it, start with our guide to PMOS (PCOS) symptoms.

What the 2023 PCOS guideline says about diet

The International Evidence-based Guideline is the main reference doctors and dietitians use. On food and lifestyle, it says:

• No best diet. There is no evidence to support any one type of diet composition over another.
• Healthy eating helps. Any eating pattern that follows population guidelines for healthy eating will have health benefits.
• Avoid unduly restrictive diets. Diets that are very restrictive or nutritionally unbalanced should be avoided.
• Benefits without weight loss. A healthy lifestyle has benefits even when weight does not change. For people at higher weight who want it, weight management can bring clinical improvements.
• Weight stigma is real. Many women with PMOS experience weight stigma in healthcare. Health professionals should be aware of their own weight bias.
• Goals are shared. Lifestyle goals should be worked out together with the person, not handed down.
• Move in a way you enjoy. No type of exercise has been shown to be better than another.

Jean Hailes and Dietitians Australia say the same thing: no one diet is best for PMOS. That is useful to know when social media promises a “PCOS protocol”.

Insulin resistance: why it matters for food

The guideline describes insulin resistance as one of the drivers of PCOS. When your body does not respond well to insulin, it makes more of it, and higher insulin can push the ovaries to make more androgens (hormones such as testosterone). Dietitians Australia notes that people with PMOS have about 2 to 3 times the risk of type 2 diabetes or prediabetes.

Insulin resistance is not only about body size. In a small Australian study using the most accurate test available, about 75% of lean women with PMOS and 95% of women with PMOS at higher weight had insulin resistance. The guideline also says routine fasting insulin blood tests are of limited use, so do not be surprised if your GP does not order one.

This is why carbohydrate quality and spacing come up so often in PMOS advice. Learn more in what is insulin resistance?

A PMOS (PCOS)-friendly eating pattern

Without a single prescribed diet, the most consistent advice from Dietitians Australia and Jean Hailes looks like this:

• Regular meals. Jean Hailes suggests eating every 3 to 4 hours to help keep insulin levels steadier.
• Half the plate as vegetables or salad at lunch and dinner, for fibre and volume.
• Fibre-rich, lower GI carbohydrates such as oats, legumes, most fruit, wholegrain bread and pasta, and basmati rice, spread across the day.
• Fish and legumes most often, with poultry, eggs and lean meat in smaller amounts. Dietitians Australia suggests a Mediterranean-style pattern that features fish, with red meat and poultry to a lesser degree.
• Unsaturated fats such as extra virgin olive oil, avocado, nuts and seeds.
• Fewer sugary drinks and highly processed foods, and less alcohol. This is about how often, not about banning anything.

If breakfast is the hard part, see our PMOS (PCOS) breakfast ideas.

Simple food swaps

These are examples of small changes that raise fibre and lower the GI of a meal. They are options, not rules.

Popular PMOS (PCOS) diets: what the evidence shows

Many diet studies in PMOS are small, short and include mostly women at higher weight, so results may not apply to everyone. A 2026 systematic review of 38 studies found most dietary approaches improved some measures, but the studies varied too much to crown a winner.

The pattern is clear: several approaches can improve markers in the short term. None has been shown to be better than healthy eating you can keep up for years.

Foods to avoid with PMOS (PCOS): myths and evidence

Search for “foods to avoid with PCOS” and you will find long lists. Most are not backed by evidence.

• Sugar. No food is off limits. Cutting back on sugary drinks, lollies and cakes is reasonable general advice, and it is easier when meals are regular and filling.
• Carbohydrates. Carbohydrate quality and amount matter, but the guideline warns against unduly restrictive diets. Wholegrains, legumes and fruit bring fibre that helps blood glucose.
• Dairy. Evidence linking dairy to PMOS is limited. If you choose to avoid it, plan other calcium sources with a dietitian.
• Gluten. Not needed unless you have coeliac disease. Healthdirect advises not to stop eating gluten until you have been tested, because it makes the tests less accurate.
• Fruit. Most fruit is low GI and rich in fibre. Dietitians Australia includes it in its recommended carbohydrate choices.
• Soy and “hormone-disrupting” foods. Online lists often include these, but the guideline does not recommend avoiding any specific food.

Supplements and herbal teas in brief

Inositol is the most popular PMOS supplement. The guideline says it could be considered based on personal preference, but the certainty of evidence is very low, no specific type, dose or combination can be recommended, and metformin should be considered over inositol for excess hair and central weight. Tell your doctor if you take it. See our full guide to inositol and metformin for PMOS (PCOS).

Spearmint tea lowered testosterone in one 30-day trial of 42 women, and women felt their hair growth improved, but the clinician-rated hair score did not change. Cinnamon supplements improved insulin resistance in a 2024 review of 12 small trials, with wide variation between studies. These were supplements, not cinnamon sprinkled on food. Neither is a substitute for medical care. If excess hair or hair loss is your main concern, see PMOS (PCOS) and hair.

Weight, body image and disordered eating

A 2024 meta-analysis of 20 studies found people with PMOS have higher odds of an eating disorder, especially bulimia nervosa and binge eating disorder, and higher disordered eating scores at all body sizes. The 2023 guideline asks clinicians to consider eating disorders in PMOS regardless of weight.

That matters for diet advice. Strict rules, long fasts and lists of banned foods can make bingeing and food guilt worse. If food or your body takes up a lot of your thinking, or you find yourself restricting and then losing control, please talk to your GP or an eating disorder dietitian. Support for PMOS can be given in a way that is safe for you.

When to see your GP

See your GP if your periods are irregular or absent, you notice new excess hair, hair loss or acne, or you are having trouble getting pregnant. Your GP can check for PMOS, type 2 diabetes and other causes, and talk through medicines such as metformin. They can also refer you to a dietitian, and you may be eligible for a Medicare rebate (see our Medicare eligibility checker). If you are planning a pregnancy, our preconception nutrition support can help.