Women with polycystic ovary syndrome (PCOS) are characterized by several hormonal and metabolic disturbances, which interact with each other. Diseases such as overweight or obesity in these women further lead to the development of metabolic complications and its consequences such as type 2 diabetes mellitus (T2DM) and cardiovascular disease. Modification of dietary habits in women with PCOS may have favourable effects on their hormonal and metabolic profile. Dietary treatment of women with PCOS should be based on balanced diet taking into consideration the glycaemic index of carbohydrates consumed. Also, enrichment of the diet with the long chain polyunsaturated fatty acids may have favourable effects. The decrease in the energy intake is mandatory in PCOS women with accompanying overweight or obesity. In addition, regular physical activity has also beneficial effects on the metabolic disturbances in these patients.