Gastric Bypass procedures reduce absorption of food, in addition to restricting food intake. Patients who have bypass operations generally lose 70 percent of their excess weight within one-and-a-half years. In the Roux-en-Y Gastric Bypass (LRYGB), the most common gastric bypass procedure, a small (30 ml) stomach pouch is created by stapling to separate it from the rest of the stomach. Then, a section of the small intestine is attached to the new pouch to allow food to bypass the first portion of the small intestine to reduce calorie and nutrient absorption. The limited quantity of food, combined with reduced absorption of calories, results in faster and perhaps more pronounced weight loss than is normally achieved by the gastric banding procedure. This procedure usually requires a two to three-day hospital stay, and normal activities can be resumed in four to five weeks.
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