| The study will address two issues: 1) the description in the changes over time as a result of the operation with regard to weight loss, comorbidities, and quality of life as well as the processes assumed to mediate these changes, i.e. eating behavior, eating relevant social cognitions, self efficacy, and hormonal changes; 2) the identification of the biopsychosocial factors which differentiate patients with successful outcomes from those with unsuccessful outcomes. |