 Those who receive continued inpatient treatment will stay in the hospital until they reach a healthy body weight and maintain it for 10 to 14 days. The average length of inpatient treatment will be 2 to 3 months. Those who receive sequenced treatment will transition to day patient status once they have met the following health benchmarks: an increase in body mass index BMI greater than 15.5 kgm2; normal electrocardiograms, lab test results, and vital signs; eating all meals for more than 3 days; no weight loss for at least 1 week or weight gain for at least 1 week if the weight gain protocol has begun; and moderate improvement on a clinical global impression CGI rating of eating disorder behavior. If participants do not meet these benchmarks and are not at medical risk or suicidal, they will be automatically transitioned to day patient care after 28 days. Once participants reach the day patient status, they will be in the hospital Monday through Friday from 8:00 a.m. until 6:00 p.m. If these participants then reach and maintain a healthy body weight for 10 to 14 days, they will be transitioned to outpatient care, during which they will receive 50-minute therapy sessions once or twice weekly. 