Losing weight will help improve your diabetic control, but weight loss surgery can effectively cure type diabetes in over 80% of cases. This is explained best by looking at the gastric bypass and sleeve gastrectomy operations. Aside from their weight loss effects, these procedures have an effect on the body’s hormonal mechanisms which can result in complete resolution of type II diabetes.
For many years we have known that following these two procedures, the levels of various diabetic hormones in your blood change immediately after surgery (before weight loss even occurs). These serve to correct your blood sugar control almost straight away. This effect can be so strong at times that patients coming into hospital on insulin injections and other medications for diabetes are quite likely to leave hospital after surgery without needing these treatments. And they may not need them ever again!