The Scales of Gastric Bypass (IMAGE) WashU Medicine Caption Gastric bypass surgery is the most effective therapy to treat or reverse type 2 diabetes in severely obese patients. A longstanding theory has suggested that the operation may have unique, weight loss-independent effects in treating diabetes. But new research from Washington University School of Medicine in St. Louis indicates that weight loss after surgery, rather than the surgery itself, drives metabolic improvements, such as the remission of diabetes. Credit Mike Worful Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.