Gastric Bypass

The Roux-en-Y gastric bypass is considered by many to be the current gold standard procedure for weight loss surgery. It is the most commonly performed weight loss procedure in the United States.

What Is 'Roux-en-Y' Gastric Bypass Surgery?
During the first part of the surgery, the stomach is divided into a large portion, and a much smaller portion. The small part of the stomach is then sewn or stapled together to make a small pouch. The small stomach pouch accommodates much less food than before the surgery.

With such a small stomach, people feel full quickly and eat less. This strategy is also called "restrictive," since the new stomach size restricts food intake.

In the bypass part of the surgery, the new, small stomach pouch is disconnected from the first part of the small intestine (the duodenum). The surgeon then reconnects the small pouch to a portion of intestine slightly further down (the jejunum). This surgical technique is called a "Roux-en-Y."

After a Roux-en-Y Gastric Bypass, food passes directly from the stomach into the jejunum, bypassing the duodenum. This leads to reduced absorption of calories and nutrients. This weight loss method is called "malabsorptive."