Although intensive medical treatment of diabetes has clearly been demonstrated to be worthwhile, it has not been a total success in diabetes treatment for a variety of reasons including lack of response to medication. Diabetes has been well demonstrated as a co-morbidity illness of obesity patients. In observation, with exclusion stomach and duodenum of bariatric surgery (gastric bypass), most morbidly obese patients (about 80%) with diabetes had a significant improved of sugar control. Base of this observation, we will try to find out the role surgical intervention (gastric bypass & sleeve gastrectomy) in obese-related diabetes.