This paper explains why nutrition is central to managing polycystic ovary syndrome (PCOS), even when someone is not markedly overweight. The authors emphasize that PCOS is strongly linked to insulin resistance and abdominal (central) fat distribution, which helps explain the elevated long-term risks for impaired glucose tolerance, type 2 diabetes, dyslipidaemia, cardiovascular disease, and other metabolic complications. Because these risks are driven in large part by insulin resistance and over-nutrition patterns, the paper argues that lifestyle change should be treated as first-line management—not an optional add-on—while also recognizing that emotional factors such as stress, depression, and body-image concerns can strongly influence adherence and outcomes.

A major point is that benefits can occur even without dramatic weight loss. Modest weight reduction (often around 5% or more) can improve insulin sensitivity, reproductive function, and endocrine features such as hyperinsulinaemia and androgen excess. The review also notes that changes in body composition matter: increasing lean mass through activity can improve metabolic health and resting energy expenditure even if the scale does not change much.

​

The paper provides practical, clinically oriented dietary targets. It recommends keeping total fat at roughly 30% of calories with saturated fat kept low, prioritizing healthier unsaturated fats, and avoiding trans fats. Carbohydrate quality is treated as critical: a high glycaemic load can worsen post-meal glucose and insulin responses and may contribute to hunger, cravings, and dyslipidaemia, so the authors favor lower-glycaemic, high-fibre, whole-grain carbohydrate choices rather than refined sources. Protein intake around 20% of calories is presented as a reasonable baseline, with the option to increase it short term for satiety and metabolic support, while avoiding excessive reliance on red meat.

​

Eating pattern is another focus. The review argues for regular meals (typically three, up to four) with less intake coming from snacks and sugary drinks, and it highlights breakfast as a helpful anchor for appetite regulation and insulin sensitivity. For physical activity, the authors recommend consistent moderate exercise (about 30 minutes on most days) for weight maintenance and metabolic health, with longer or more intense activity often needed for weight loss. They also highlight resistance training as an underused tool for improving insulin sensitivity and body composition. Medications such as metformin or weight-loss agents are framed as adjuncts that may be useful early and short term, ideally alongside diet and exercise rather than replacing them.

Published in Journal of Obstetrics and Gynaecology (2007), 27(8):762–773.