Home > Obesity > Gastric Bypass Surgery for Diabetes Patients Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Aug 14, 2010 by Cleveland Clinic, Views: 2605 A Cleveland Clinic study indicates that gastric bypass surgery may work better than medicine in some cases for treating diabetes. This form of weight loss surgery involves reducing the size of the stomach and then bypassing the upper part of the intestine. Then the lower part of the intestine is connected to the newly formed and smaller stomach. Physicians believe that bariatric surgery may lead to a favorable change in certain types of so-called "gut hormones."