Roux-en-Y Gastric Bypass (RYGB)

RYGB works by restricting food intake and by decreasing the absorption of food. Food intake is limited by a small pouch that is similar in size to the adjustable gastric band. In addition, absorption of food in the digestive tract is reduced by excluding most of the stomach, duodenum, and upper intestine from contact with food by routing food directly from the pouch into the small intestine.

This procedure creates a faster feeling of fullness and allows for less absorption of calories from food. It does restrict the absorption of nutrients, such as iron, calcium and vitamin B12, so vitamin supplements are essential. Dumping syndrome is also frequently experienced following Roux-en-Y procedures.

A person may experience multiple symptoms, including nausea, weakness, sweating, lightheadedness and diarrhea after eating sweets or large amounts of food. This reinforces adherence to healthy eating practices.

Gastric bypass is one of the more invasive types of bariatric surgery and has a higher risk of complications and side effects. Gastric bypass can be performed laparoscopically and patients usually lose between 60-80% of excess body weight .