Besides weight loss, spectacular metabolic improvements after bariatric surgery are seen. In patients with T2D, normalization of fasting plasma glucose and/or HbA1c without medication (referred as "resolution of T2D") was observed in 48% and 83% after gastric banding and RYGB, respectively. Recently, randomized controlled trials showed the superiority of bariatric surgery in glycemic control above conventional medical treatment. Furthermore, the improvement in glycemic control is higher in RYGB compared to purely restrictive bariatric procedures.