Roux-en-Y gastric bypass is the most common gastric bypass surgery done in the U.S. It can be done with a small cut, and has A quicker recovery time.
Extensive gastric bypass (biliopancreatic diversion) is a more complicated type of gastric bypass. A surgeon removes the lower part of the stomach. Then she connects the small pouch that remains to the last part of the small intestine, completely bypassing the first two parts. While it works for weight loss, it's not widely used because it has complications.