GSH-FBT consists of 10 20-minute parent-only sessions over 9 months. The guidance portion is manualized and will be delivered by a clinician familiar with both the online modules and FBT, who acts as a "coach." Sessions follow an online curriculum containing a total of 65 short videos. Each lecture series is comprised of a written introduction orienting the viewer to the videos, 5-9 short videos (< 7 minutes each), and assigned reading from the parent education manual, Help Your Teenager Beat an Eating Disorder. In line with GSH approaches, coaches direct parents to watch or re-watch specific videos contained in the online platform related to their questions.

15 60-minute sessions of 3-phase manualized FBT modified for videoconferencing will be delivered to participants randomized to this treatment by therapists trained in FBT. The first phase encourages parental management of weight restoration (approximately 8 weekly sessions); the second phase promotes a developmentally appropriate transition back to adolescent management of weight restoration and maintenance under parental supervision (approximately 4 bi-weekly sessions), and the third phase focuses on adolescent development (approximately 3 monthly sessions). Each session consists of 10 minutes with the adolescent individually to discuss progress and the adolescent's perspective on treatment, followed by 50 minutes with the entire family.

GSH-FBT consists of 10 20-minute sessions for parents only over 9 months. Sessions follow an online curriculum of 65 short videos: 62 with an expert clinician instructing parents on the principles of FBT, and 3 reflections from an adolescent who recovered from AN and completed FBT. Each lecture series contains an introduction orienting the viewer to the videos, 5-9 short videos (< 7 minutes each), and assigned reading from the parent education manual Help Your Teenager Beat an Eating Disorder. Three lectures include additional resources for parents (e.g., Academy of Eating Disorder (AED) Medical Management Guidelines). Homework assignments are included with some lectures (e.g., strategies to help the child eat during meals, practice making calorically dense meals). In line with GSH approaches, coach-therapists direct parents, to watch or re-watch specific video content contained in the online learning material related to their questions rather than direct behavioral change.

The investigators will compare GSH-FBT and FBT-V groups at EOT in terms of the change in %EBW from baseline divided by total therapist time utilized. Estimated Body Weight (EBW) percentages used will be calculated using Center for Disease Control metrics in children and adolescents. Total therapist time utilized will be collected based on video records of actual sessions spent with participants.

The EDE is a standardized investigator-based interview that measures the severity of the characteristic psychopathology of eating disorders. The psychometric properties of the EDE are sound and validated in diverse samples. It takes about 1 hour to complete.