Lapsurgery.com.au, Roux y gastric bypass Process – Roux-en-Y gastric bypass (RYGB) is a surgical procedure that plays a crucial role in treating severe obesity. During the process, a small stomach pouch is created by stapling the upper part of the stomach, restricting the amount of food it can hold. This pouch is then connected directly to the small intestine, bypassing a portion of the stomach and the upper part of the small intestine.