Polycystic ovary syndrome affects around eight to thirteen percent of women of reproductive age and is closely tied to insulin resistance, which makes dietary pattern a genuinely relevant lever rather than a secondary consideration in management.
International PCOS guidelines currently recommend a dietary pattern consistent with general population guidelines, largely because no single diet has been proven superior. Even so, a growing number of trials have tested the Mediterranean pattern specifically. A twelve week randomised controlled trial published in Frontiers in Nutrition in 2022 compared a Mediterranean diet combined with a lower carbohydrate approach against a low fat diet in seventy two women with PCOS. Both groups improved, and the combined Mediterranean and lower carbohydrate group saw favourable changes in insulin resistance, testosterone, and the return of normal menstrual cycles in a meaningful number of participants.
A pilot randomised controlled trial published in 2025 tested a Mediterranean diet without any caloric restriction over twelve weeks in overweight women with PCOS and found the approach to be both feasible and acceptable, building on earlier observational research showing that women with higher Mediterranean diet adherence tend to have lower rates of hyperandrogenism, the excess androgen production that drives many PCOS symptoms.
The proposed mechanism runs through insulin. Because insulin resistance in PCOS drives the ovaries to overproduce androgens, any dietary approach that improves insulin sensitivity, such as a diet built around monounsaturated fats, fibre, and a lower glycaemic load, has a plausible route to improving the hormonal picture as well as the metabolic one.
This is not a promise that diet alone resolves PCOS, and no ethical practitioner would present it that way. What the current evidence does support is that a Mediterranean pattern is a reasonable, well tolerated, and increasingly well studied option for women looking to improve the insulin resistance that sits underneath so many PCOS symptoms.
References
- 1. Mediterranean diet combined with a low carbohydrate dietary pattern in the treatment of overweight polycystic ovary syndrome patients. Frontiers in Nutrition. 2022.
- 2. A pilot randomized control trial evaluating the feasibility of a twelve week Mediterranean diet intervention without caloric restriction in women with polycystic ovary syndrome. 2025.
- 3. Efficacy, feasibility and acceptability of a Mediterranean diet intervention on hormonal, metabolic and anthropometric measures in overweight and obese women with polycystic ovary syndrome: study protocol. Metabolites. 2022;12(4):311.
