Laparoscopic gastric bypass surgery using the Roux-en-Y procedure has a long history of successful weight loss in the United States and is regarded as the most effective treatment for morbid obesity currently available.
How Gastric Bypass Works
During this operation, the stomach size is reduced into a small pouch about the size of a walnut. The small intestine is divided in half and the lower portion is attached to the new stomach pouch as the outlet for food.
The upper part of the small intestine connected further down the outlet branch of the small intestine forming the “Y” in the name Roux-en-Y.
Using this technique most of the stomach and the upper portion of the small intestine is bypassed by food. In combination, the smaller stomach pouch, which holds only about one ounce of food, and the shorter length of intestine available to absorb calories, results in weight loss of about 60 percent of excess body weight.
The bypassed section of stomach and small intestine continue to produce digestive juices that contribute to healthy digestion of the food eaten.