Can diet help insulin resistance in PCOS?

In brief

Insulin resistance is common in PCOS, including in people who are not overweight. Healthy eating and physical activity are recommended by the international guideline as part of managing metabolic health, and lifestyle trials show modest improvements in some insulin markers. No single diet has been shown to be better than others for this. What matters most is a balanced pattern that can be sustained.

What the evidence suggests

  • The 2023 international guideline recognises insulin resistance as a key feature of PCOS that occurs independently of body weight, and recommends lifestyle intervention as part of care.
  • A Cochrane review found lifestyle programmes improved some measures of insulin resistance compared with minimal intervention, based on low-certainty evidence from small trials.
  • A systematic review comparing diet compositions in PCOS found no consistent advantage for one composition over another on insulin outcomes, with most benefit linked to the overall change in eating pattern.

What varies between people

  • The degree of insulin resistance differs widely, and it is not routinely measured in clinical practice, so two people with PCOS can respond very differently to the same changes.
  • People taking metformin or other glucose-lowering medicines need their eating pattern reviewed with their doctor, particularly around meal timing.
  • Family history of type 2 diabetes and ethnic background affect metabolic risk.

What the evidence does not say

  • The evidence does not show that a low-carbohydrate, ketogenic or very low glycaemic index diet is superior to other balanced diets for insulin resistance in PCOS.
  • It does not establish that cutting out whole food groups such as rice, roti or dairy is necessary.
  • Evidence for inositol remains limited. The guideline says specific types, doses or combinations cannot currently be recommended because quality evidence is lacking, and describes its clinical benefits as limited.

What this looks like in real food

Examples of everyday staples across cuisines. None of these foods treats PCOS. They show how a balanced plate can look in the food you already eat.

South Asian

Staple carbs:
Whole wheat roti, Brown or parboiled rice, Millets such as jowar, bajra and ragi, Poha and upma with vegetables
Proteins:
Dal and other pulses, Paneer, curd and milk, Eggs, Chicken and fish
Fats:
Mustard, groundnut or sesame oil in measured amounts, Nuts and seeds, Small amounts of ghee

Mediterranean

Staple carbs:
Wholegrain bread, Bulgur and farro, Wholewheat pasta, Potatoes with skin
Proteins:
Chickpeas, lentils and beans, Fish, Greek yoghurt, Eggs
Fats:
Olive oil, Olives, Nuts

East Asian

Staple carbs:
Brown or mixed-grain rice, Soba noodles, Congee with added vegetables
Proteins:
Tofu, tempeh and edamame, Fish, Eggs, Lean pork or chicken
Fats:
Sesame oil in small amounts, Peanuts, Oily fish

Middle Eastern

Staple carbs:
Wholemeal pita, Freekeh and bulgur, Brown rice
Proteins:
Hummus and ful medames, Lentil soup, Labneh and yoghurt, Grilled chicken or fish
Fats:
Olive oil, Tahini, Pistachios and almonds

Western

Staple carbs:
Oats, Wholegrain bread, Potatoes with skin, Wholewheat pasta
Proteins:
Beans and lentils, Eggs, Chicken and fish, Yoghurt and cheese
Fats:
Olive or rapeseed oil, Nuts and seeds, Avocado

Related questions

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References

  1. Teede HJ, Tay CT, Laven JSE, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. J Clin Endocrinol Metab. 2023;108(10):2447-2469. Source
  2. Lim SS, Hutchison SK, Van Ryswyk E, Norman RJ, Teede HJ, Moran LJ. Lifestyle changes in women with polycystic ovary syndrome. Cochrane Database Syst Rev. 2019;3:CD007506. Source
  3. Moran LJ, Ko H, Misso M, et al. Dietary composition in the treatment of polycystic ovary syndrome: a systematic review to inform evidence-based guidelines. J Acad Nutr Diet. 2013;113(4):520-545. Source