 Five percent of young women meet criteria for anorexia nervosa, bulimia nervosa, or binge eating disorder, with another 5 meeting criteria for Eating Disorder Not Otherwise Specified ED-NOS, which includes subthreshold variants of these disorders. Over half of those presenting for eating disorder treatment meet criteria for ED-NOS and both threshold cases and ED-NOS are marked by chronicity, relapse, distress, functional impairment, and increased risk for future obesity, depression, suicide attempts, anxiety disorders, substance abuse, morbidity, and mortality. Anorexia and bulimia nervosa show stronger relations to suicide attempts, outpatientinpatient treatment, and functional impairment than most other psychiatric disorders. Treatment of eating disorders is very expensive, similar to the cost for schizophrenia treatment, and is effective for only 40-60 of patients. Thus, a public health priority is to develop and disseminate effective eating disorder prevention programs. 