Obese youth and young adults (BMI ≥ 30kg/m2) between the ages of 14 and 24.9 years (initially up to 21 years) are eligible to participate. Participants will be asked to complete a series of questionnaires on their general health, psychosocial situation and wellbeing, and will be offered a thorough medical evaluation. Individuals who complete the baseline evaluations will be invited to participate in 6 group sessions over a 3 months period. Group assignment to the psycho-social intervention vs. routine care group will be at random, like throwing a dice. After 6 months, participants will complete further questionnaires to evaluate the effects of the interventions on quality of life and psycho-social functionning.