The investigators are examining what types of psychotherapy are most helpful for patients as they undergo weight restoration treatment for anorexia nervosa. In this study, patients who are receiving care on our inpatient unit will also receive 4 weeks of one two types of psychotherapy: Supportive Psychotherapy or Regulation Emotions and Changing Habits.

Patients will be receiving specialized inpatient treatment for anorexia nervosa on the Eating Disorders Unit at the New York State Psychiatric Institute, where care is provided free of charge.

Study procedures will begin after one week of acclimating to the inpatient unit. Patients will be randomly assigned to receive either Supportive Psychotherapy (focused on the transition to the inpatient unit) or REACH (focused on changing routines or habits that have become part of the eating disorder). Each treatment consists of 12-sessions, delivered 2-3 times per week.

Before and after treatment, patients will be asked to participate in interviews, questionnaires, and a lunch meal.

Inclusion Criteria:

• DSM5 diagnosis of anorexia nervosa
• Age>= 18
• Medically stable
• Able to provide informed consent

Exclusion Criteria:

• Other psychiatric disorder requiring acute treatment
• Serious medical illness
• Antipsychotic medication
• Severe cognitive impairment