The duodenal switch is a complex, yet extremely effective weight loss operation that both decreases the size of the stomach and limits the absorption of calories from food. Presenting Physician Marc Bessler, MD Weight Loss Other Media by this Physician Duodenal Switch Sleeve Gastrectomy Gastric Bypass Surgery Preparing for Weight Loss Surgery Sleeve Gastrectomy Operation Adjustable Gastric Banding Bariatric Surgery - An Overview