 Purging can include self-induced vomiting, over-exercising, and the use of diuretics, enemas, or laxatives.Anorexia nervosa is characterized by extreme food restriction, low body weight, and the fear of becoming fat.Pubertal and post-pubertal females with anorexia often experience amenorrhea, or the loss of menstrual periods, due to the extreme weight loss these individuals face.