This book presents and describes the various uses of gastric bypass in bariatric and metabolic surgery and outlines the different techniques currently available. Furthermore, the possible complications with the procedure and ways to avoid them are also discussed. The use of the gastric bypass for the treatment of diabetes is emphasized and the new indications for the operative treatment of diabetes are featured in detail. Endoscopic uses concerning the gastric bypass are also addressed, covering preoperative evaluation, complications treatment, weight regain treatment and endoscopic treatment of obesity. The most advanced techniques and new technologies available for performing gastric bypass surgeries are presented in the most didactic