In France the prevalence of obesity is less than in United-States, England or Eastern Europe, but there are a progressive augmentation, especially in 35-55 years old people and in the North and East of France, in cities and the poor localizations. Careful patient selection and preoperative work-up are extremely important and now very well codified by ANAES recommendations that are carefully follow-up by national social security. Weight loss obtained after bariatic surgery improved comorbidities. If patient cannot lose weight with traditional methods, because of morbidity and late term complications, surgery should be considered. Bariatric surgery is most time safe and effective method for achieving durable weight loss for patients with morbid obesity. Different interventions include long-limb gastric diversion with duodenal switch. The principal indications are the morbid obesity (BMI >40 kg/m2) resistant to medical treatment,  obesities with BMI between 35 and 40 kg/ m2 with comorbidities, and with a multidisciplinary decision (psychologist, nutritionist, bariatric surgeon). This kind of surgery is not indicated in the cases of social, familiar, psychological difficulties, and the impossibility of the patient to follow-up the postsurgical protocol. The benefits of the lost weight are important (biological and quality of life parameters are described). Adverse events have been reported for all kind of surgery. A careful selection of the patients should be done to minimize the complications of surgery.