: Polycystic ovary syndrome is one of the most common endocrinopathy of the reproductive age. Heterogenity of its clinical symptoms is related to the presence of a number of phenotypes of this disfunction, hence the necessity for individualized treatment is needed. A change of a lifestyle, well-balanced diet and physical activity are the most effective medical way contributing to the improvement of carbohydrate metabolism parameters and weight reduction which reactivates regular ovulation and facilitates getting pregnant. A change of diet should encompass determination for appropriate calorie requirements, content of particular macroelements as well as selection of the products with low glycemic index. Vitamin D supplemantation as well as inosital is of great importance as well. Both these ingredients are extremely effective in treating the disorders resulting from polycystic ovary syndrome. Adding them to a daily diet contributes to improving carbohydrate metabolism and reducing insulin resistance. Additionally, they accelerate weight loss, regulate menstrual cycles and enhance reinstating regular ovulation, hence facilitate to get pregnant. Together with introducing dietary changes, patients should be reminded about the crucial role of physical activity. A kind of exercises should be chosen according to a patient's preferences and be adjusted to her actual health condition. Only physical activity done with pleasure may become a healthy custom improving the effects of a proper diet.