Patient selection is very important in metabolic surgery applications. It is not the right approach to do these surgeries for every diabetic patient. Detailed laboratory examinations should be performed in patients who are scheduled for surgery. The molecular values used in the production of the insulin hormone in the body, that is, the precursors of the insulin hormone, must be at a sufficient level. Like all bariatric surgeries, these are surgeries that require permanent lifestyle changes. The durability of the results generally depends on this. In this context, it is very important for patients to increase their post-operative education and knowledge about diet and exercise.