The overarching aim of this research project is to enhance our understanding of how to optimize the level of care provided to individuals with eating disorders and obesity, thereby contributing to the improvement of their quality of life. The project is guided by strategies associated with step-wise programs tailored to individuals. That is, how we can provide the necessary level of treatment but no more. The strategy is straightforward, yet empirical evidence upon which to build treatment individualization is still limited. The main idea is based on the observation that not all individuals at risk for developing an eating disorder end up developing one, and not all those who develop an eating disorder require the same level of treatment intensity. Depending on severity, developmental history, and personal characteristics, some may be assisted through psychoeducational information or self-help programs, while others may benefit from support from family and friends, and still others may require specialized and intensive individual treatment. Unfortunately, the literature is insufficient to guide clinical decisions regarding the necessary level of treatment. With these principles in mind, the present project includes a comprehensive approach to the treatment of eating disorders and obesity. First, a prevention program, including an early detection module, will be developed. This program will not only allow for the early detection of cases but also provide a first line of treatment through an internet-based self-help program. In parallel, we will develop innovative strategies in the treatment and prevention of obesity. For obese children or those at risk, we will develop and adapt a program involving the family, focusing on three fundamental behaviors in weight management: diet, physical activity, and sedentary time. This program will be accompanied by a follow-up module via text messages (SMS) aimed at promoting motivation and program adherence. The project also aims to expand post-bariatric surgery follow-up strategies already used in the post-treatment of patients with eating disorders. These strategies aim to maintain therapeutic gains and prevent relapse. By focusing on pre-surgical assessment and psychoeducational strategies followed by post-surgical monitoring and feedback, we hope to increase the likelihood of therapeutic success by reducing the likelihood of weight gain-associated behaviors and habits and aiding in the detection of critical cases requiring medical attention.