Caloric utilization is an important aspect of the clinical management of eating disorders. Caloric intake and body weight of 32 inpatient bulimic and anorectic girls and 30 normal adolescents were measured. Normal weight bulimics ate fewer calories while anorectics ate more calories per kilogram body weight compared with the control group. Anorectics have greater difficulty to eat sufficient calories to maintain their weight. These findings indicate that treatment should be extended beyond the point of time where normal weight is reached.