Eating disorders are psychological illnesses defined by abnormal eating habits that may involve either insufficient or excessive food intake to the detriment of an individual's physical and mental health. Bulimia nervosa and anorexia nervosa are the most common specific forms of eating disorders. Other types of eating disorders include binge eating disorder and OSFED. Bulimia nervosa is a disorder characterized by binge eating and purging. Purging can include self-induced vomiting, over-exercising, and the usage of diuretics, enemas, and laxatives. Anorexia nervosa is characterized by extreme food restriction to the point of self-starvation and excessive weight loss. The extreme weight loss often causes women and girls who have begun menstruating to stop having menstrual periods, a condition known as amenorrhea, although some women who meet the other DSM-5 criteria for anorexia nervosa still report some menstrual activity. The DSM-5 currently specifies two subtypes of anorexia nervosa—the restricting type and the binge/purge type.