Considered the "gold standard" of bariatric surgery, gastric bypass is the most common weight loss operation. The procedure involves converting the stomach from the size and shape of a football, to the size of a thumbnail.
First, a small stomach pouch is created to restrict food intake. Next, a Y-shaped section of the small intestine is attached to the pouch to allow food to bypass the lower stomach, the duodenum (the first segment of the small intestine), and the first portion of the jejunum (the second segment of the small intestine).
This bypass reduces the amount of calories and nutrients the body absorbs. Although individual results vary, patients generally lose two-thirds of their excess weight within two years.
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