Gastric Bypass is generally considered the most effective weight-loss surgery. This is because patients see rapid initial weight loss, and most maintain the majority of their weight loss several years after surgery.
This surgery is more invasive than other surgery options. It consists of making the stomach smaller by creating a small pouch at the top of the stomach using surgical staples or a plastic band. The smaller stomach is then connected directly to the middle portion of the small intestine (jejunum) that has been detached from the upper portion of the intestine (duodenum). This causes food to bypass the rest of the stomach and the upper portion of the small intestine. This surgery will alter the normal digestive process, causing fewer calories and nutrients to enter the body. This can lead to nutrient deficiencies and requires a permanent change in eating habits.