Goodform: A cluster randomised controlled trial of a school-based program to prevent body dissatisfaction and muscle...

Although body dissatisfaction is common among adolescent boys, few intervention programs specifically developed for boys have been shown to be effective for reducing body dissatisfaction. Our study aim was to evaluate Goodform, a 4-session, teacher delivered intervention program specifically developed for boys to reduce body dissatisfaction and muscle building supplement use. The Goodform program was based on cognitive dissonance, social learning theory, and a social norms approach, and drew from two existing body image intervention programs that have shown promise among males: The Body Project- More than Muscles, and the Athletes Training and Learning to Avoid Steroids Program (ATLAS). A sample of 488 boys in grades 9 and 10 (M_age = 14.81, SD_age = 0.51) at nine secondary schools in Australia were randomly assigned to Goodform (n = 244) or control (n = 244) at the school level. Self-reported body image, supplement use, anabolic androgenic steroid (AAS) use, and attitudes around using AAS and muscle building supplements were measured at baseline, post-intervention, and eight-week follow-up. Analyses with multi-level, mixed-effect regression models revealed no changes over time attributable to the intervention. Our results have implications for researchers in the body image and eating disorder prevention fields. Lessons learned in this study can inform future school-based efforts for reducing muscle building supplement use.