What Is the Roux-En-Y Gastric Bypass (RNY) Procedure?
First, the stapling and cutting away of the old stomach create a small stomach pouch, which 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 (the first segment of the small intestine) as well as the first portion of the jejunum (the second segment of the small intestine). This causes reduced calorie and nutrient absorption. Back to top.