While dieting is certainly valuable, it is the most difficult of therapeutic regimens to administer. With weight loss there is often an improvement in endocrine parameters and sometimes a return of menses. Plans that focus on behavioral modification and group involvement, for example “Weight Watchers,” have been the most effective. Weight loss may improve general health and menstrual regularity, but may have little effect on hirsutism. Diet plans approved by the American Diabetes Association (ADA) all are excellent for PCOS. They are well balanced and a number of plans are available. Books containing these diets are available in most book stores. All women contemplating a pregnancy should use folic acid supplements. Regular exercise is encouraged. Fad diets are discouraged. The emphasis must be on life- long changes if the tendency toward development of type 2 diabetes and abnormal blood lipid levels is to be avoided.