[Obesity surgery and its adverse effects].

Bariatric surgery (gastric banding, gastric bypass, sleeve gastrectomy, bilio-pancreatic diversion) is the most efficient long-term treatment concerning weight loss, comorbidities and quality of life improvement, and mortality reduction for massive obesity and complicated obesity. These benefits need to be compared to immediate and late adverse events. The adverse events involve operative risk, surgical, nutritional, and sometimes psychological events. This review describes the various surgical techniques and their complications. Then, it discusses the modalities to prepare, follow-up and take care of these surgical patients to improve the results and avoid the complications.