A combination procedure in which a small “pouch” is created from permanent surgical division of the stomach to restrict the volume of food that can be eaten. This pouch is then connected directly to the jejunum (the latter portion of the small intestine) causing malabsorption of some nutrients, vitamins, and minerals. The remaining portion of the stomach stays intact while the bypassed portion of the small intestine continues to drain bile and pancreatic juices at another connection further down the intestine.

The most common gastric bypass procedure. First, a small stomach pouch is created by stapling or by vertical banding. This causes restriction in food intake. Next, a Y-shaped section of the small intestine is attached to the pouch to allow food to bypass the duodenum as well as the first portion of the jejunum.

The most commonly performed malabsorptive surgery. Special staples are used to section off a tiny portion of the stomach that holds one ounce of food or less. A small Y-shaped section of the small intestine is attached to the pouch to allow food to bypass the lower stomach as well as the first and second segments of the small intestine.