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Roux-en-Y Gastric Bypass or gastric bypass surgery uses both restriction and malabsorption to help patients lose weight. During the procedure, the surgeon creates a smaller stomach pouch. The surgeon then attaches a Y-shaped section of the small intestine directly to the pouch. This allows food to bypass a portion of the small intestine, which absorbs calories and nutrients. Having the smaller stomach pouch helps you to feel fuller sooner and eat less food. The bypassed portion of the small intestine reduces the amount of calories and some nutrients that your body will absorb.
According to the American Society for Metabolic and Bariatric Surgery and the National Institutes of Health, Roux-en-Y gastric bypass is the current gold standard procedure for weight loss surgery. The gastric bypass helps patients lose weight by helping you feel more satisfied with less food; limiting calorie absorption; and changing gut hormones that helps promote satiety, suppress hunger and helps reverse diabetes.
- Produces significant long-term weight loss (60 to 80 percent excess weight loss)
- Limits the amount of food that can be eaten
- May lead to conditions that increase energy expenditure
- Produces favorable changes in gut hormones that reduce appetite and enhance satiety
- Typical maintenance of >50% excess weight loss
- Is technically a more complex operation than the band or sleeve and potentially could result in greater complication rates
- Can lead to long-term vitamin/mineral deficiencies particularly deficits in vitamin B12, iron, calcium, and folate
- Requires adherence to dietary recommendations, life-long vitamin/mineral supplementation, and follow-up compliance
- Dumping syndrome can occur. While generally not considered to be a serious risk to your health, the results can be extremely unpleasant and can include nausea, weakness, sweating, faintness, heart palpitations and, on occasion, diarrhea after eating.