Crosby, Ross D.

AbstractObjectiveGiven that weight gain patterns in adolescents receiving outpatient Family‐Based Treatment (FBT) have not been characterized, the purpose of this study was to examine trajectories of weight gain in a group of adolescent patients with a restrictive eating disorder [e.g., anorexia nervosa (AN) and atypical AN] receiving FBT. This study also examined the association of patient characteristics with weight gain trajectories, including age, diagnosis, weight suppression, presenting BMI‐for‐age percentile, and eating pathology.MethodLatent growth mixture modeling was used to identify distinct weight trajectories, as defined by change in BMI‐for‐age percentile, for 153 adolescents with AN or atypical AN, receiving FBT.ResultsThere were five distinct weight gain trajectory profiles for adolescents receiving FBT for a restrictive eating disorder. Younger age and greater weight suppression were associated with more rapid weight gain trajectories. A pattern of slow and consistent weight gain was associated with older age and less eating pathology.DiscussionThere was considerable variability in weight gain trajectories in youth receiving outpatient FBT for a restrictive eating disorder. This suggests that patients' presenting information can be used to inform expectations regarding weight gain trajectories.