Objective: This study aims to evaluate the feasibility and effectiveness of the OB-WELL program, an internet-based self-help intervention grounded in the principles of Cognitive Behavioral Therapy (CBT) and Brief Strategic Therapy (BST), designed to promote psychological well-being among individuals with obesity from the general Italian population. Methods: A three-arm randomized controlled trial with individual-level random allocation will be conducted to compare two active intervention formats - CBT and BST - with a waiting list (WL) control condition. The intervention will last six weeks and will consist of five online self-help modules followed by one individual synchronous session. Selected psychological outcomes will be assessed at baseline and immediately post-intervention (after 6 weeks). Participants in the experimental groups will also complete follow-up assessments at 3, 6, and 12 months after treatment termination.
Expected results and conclusions: Both active interventions are expected to show greater improvements immediately post-treatment compared to the waitlist (WL) condition, and these effects are anticipated to be maintained over time. It is further hypothesized that the BST condition will demonstrate greater stability of psychological outcomes at follow-up compared to CBT.