Inclusion Criteria:  Meets criteria for AN or atypical AN according to DSM-5 diagnostic criteria. Currently living at home with caregivers who are willing to engage in family treatment. Medically stable for outpatient treatment according to the recommended thresholds of the American Academy of Pediatrics and the Society of Adolescent Medicine (e.g., ≥75% of expected body weight, heartrate ≥50 beats per minute) and receiving medical monitoring from a clinician throughout treatment. If on psychotropic medication, meets all eligibility criteria while on stable dose of psychotropic medication for a co-morbid condition. Available for follow-up.  Exclusion Criteria:  Associated physical illness that necessitates hospitalization. Psychotic illness/other mental illness requiring hospitalization. Current dependence on drugs or alcohol. Physical conditions (e.g. diabetes mellitus, pregnancy) known to influence eating or weight. Concurrent involvement in other psychological treatment for an eating disorder. Developmental delay that would preclude participation in the intervention.