Gastric bypass is a type of surgery of bariatric surgery or metabolic surgery. It also has several types. They have different names depending on the length of intestine you use and how much of the stomach you cut. The most commonly applied type is the type of surgery we call Roux-En-Y. Here, unlike sleeve gastrectomy, sleeve gastrectomy is both a restrictive and absorption-regulating surgery. We cut and reduce the stomach, we reduce its volume, at the same time, you bring the small intestine close to the large intestine and combine it with the stomach. Therefore, by providing less absorption from the things you eat less, we enable you to lose weight in two ways.