The ACTyourCHANGE Study Protocol for Adolescents

"The proposed intervention was designed by the authors of the study. It was developed following the main ACT-based manuals, with adjustments according to the users and the context of the study implementation.~Specifically, we developed a practical and interactive intervention, which comprises practical activities such as roleplay and writing activities and imaginative activities supported by metaphors. The sessions are based on the use of age-appropriate language to convey the most complex therapeutic processes easily. According to Strosahl and colleagues' model, sessions will respectively target the components of openness, awareness, and engagement."

adolescents will be assessed by a staff dietician and placed on an individualized hy-pocaloric balanced Mediterranean diet. They will also follow a nutritional counselling aimed at promoting the adoption of a healthy lifestyle. Moreover, they will attend a physical activity program consisting of five training sessions per week lasting one hour each with trainers; In addition, they will be involved in psychological counselling pro-vided once a week by a clinical psychologist, aimed to address psychological factors related to dysfunctional lifestyle habits.