Adaptive Treatment for Adolescent Anorexia Nervosa

Inclusion Criteria: * 12-18 years of age and living with participants' families * meeting DSM-5 criteria for AN (both subtypes) except for the amenorrhea requirement * medically stable for outpatient treatment according to the recommended thresholds of the American Academy of Pediatrics and the Society of Adolescent Medicine. Exclusion Criteria: * associated physical illness that necessitates hospitalization * psychotic illness, mental retardation, or any other mental illnesses that would prohibit the use of psychotherapy * current dependence on drugs or alcohol * physical conditions (e.g. diabetes mellitus, pregnancy) known to influence eating or weight * previous FBT * currently taking medication for co-morbid disorders that cannot be safely discontinued on a stable dose for less than 2 months * in the case of patients with current, or a history of sexual or physical abuse by family members, perpetrators of the abuse will be excluded from treatment.