It is a type of surgery in which food absorption and intake are reduced. In gastric bypass surgeries, a large part of the stomach is bypassed and a small-volume stomach section is prepared and sutured to the small intestines.

With this surgery, although the stomach volume is reduced, some of the intestines are disabled and some of the consumed foods are aimed to be thrown out without being absorbed. As a result, they are both satiated with less food, and some of the food taken is absorbed.