Since the volume of the stomach is reduced, the patient's food intake is reduced. In addition, the absorption of total calories, protein and other nutrients in the patient decreases as a result of the elimination of the intestine of 150-200 cm.

The surgery is performed under general anesthesia. First of all, the operation starts with the small intestine anastomosis, in which the small intestine of 150-200 cm is disabled for absorption. A new 30-milliliter pouch is then created in the stomach. The surgery is ended with a second anastomosis made between the feeding leg of the small intestine and this new stomach pouch. Gastric bypass surgery can be performed both laparoscopically and robotically.