This study is a randomized controlled trial in which 40 adolescent girls aged 12-17 years-old with weight in the 75th percentile or higher for their age and sex, and elevated anxiety symptoms, will be randomly assigned to an IPT or CBT 12-week group intervention. Approximately 20 adolescent girls will be enrolled at each of two sites: Uniformed Services University (USU) and Colorado State University (CSU). After a screening and baseline assessment, participants will attend an individual meeting with the leaders of their assigned group to learn more about the group process and establish goals. They will then participate in the group program for 12 consecutive weeks. Each group will be led by a PhD-level clinical psychologist and a healthcare trainee. In-person and remote assessments, will be conducted at baseline, in the ~two weeks post-intervention (i.e., 12-week follow-up), and at 1, 2, and 3 years post-intervention. These assessments will consist of body measurements, blood draws for collection markers of metabolic functioning, and surveys and interviews of psychological and social functioning. At baseline, two weeks, and one year post-intervention, participants will also have a week-long period during which they will wear devices collecting activity and physiological data, and complete phone surveys assessing disinhibited eating behaviors, food craving, affect, cognitions, and avoidance behaviors.
Project ASSET will explore the preliminary efficacy of interpersonal therapy, when compared with cognitive behavioral therapy, for reducing anxiety symptoms, preventing excess weight gain, and reducing cardio-metabolic risk in adolescent girls with above-average weight and elevated anxiety. As a pilot for a larger multi-site study, this trial will also test multi-site feasibility, acceptability, and intervention fidelity.