Gastric bypass is a surgical procedure used in the treatment of obesity. This surgery limits food intake by reducing the size of the stomach and bypassing a portion of the intestines. During the procedure, the stomach is divided into a small upper pouch and a larger lower pouch. The upper pouch restricts the amount of food that can be consumed, while the connection between the intestines is altered to reduce nutrient absorption. This encourages weight loss. Gastric bypass surgery induces weight loss through both hormonal changes and a mechanical effect. A careful diet and lifestyle change are necessary after the surgery. A follow-up program guided by a specialist doctor is crucial for post-operative success.