This is a cluster randomized controlled trial with two assessment points (baseline and 24-week follow-up) comparing the Claudia Carraro prevention program to a no-intervention control group. The intervention group was also assessed at post-intervention. To ensure that all students benefit from the intervention, the control group received the intervention after the 24 weeks. Randomization was performed at the school level, not the student level.
Inclusion Criteria: * Students in the first or second year of upper secondary school * Students who signed a written informed consent * Informed consent signed by their parents Exclusion Criteria: * Students who self-reported diagnosis of an eating disorder (these individuals could participate in the intervention but were excluded from data analysis)