[Pharmacological therapy versus bariatric surgery for patients with obesity and type 2 diabetes].

There is strong epidemiological evidence for an association between increased body weight and a higher incidence of type 2 diabetes. Moreover, reduction in body weight may delay the onset of type 2 diabetes. The basic therapy of type 2 diabetes includes lifestyle modifications, such as education, nutritional advice, increased physical activity, non-smoking and strategies to cope with stress. If lifestyle modifications are not successful, antidiabetic pharmacotherapy is stepwise intensified to achieve individual therapeutic targets; however, pharmacological treatment of type 2 diabetes frequently fails to prevent the progress of the disease and the manifestation of diabetes complications. Sustained weight reduction belongs to the individual treatment targets for patients with obesity and type 2 diabetes. Because conservative weight reduction strategies are frequently not successful, bariatric surgery has emerged as an effective treatment particularly for those patients with obesity-associated type 2 diabetes in whom a glycosylated hemoglobin (HbA1c) target < 7.5% could not be achieved with pharmacological therapy. Bariatric surgery should no longer be considered as the last option for patients with obesity-associated type 2 diabetes.