The Roux en-Y Gastric Bypass is the most common and successful type of malabsorptive surgery. Malabsorptive operations restrict both food intake and the amount of calories and nutrients the body absorbs and are the most common gastrointestinal surgeries for weight loss.
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, and is both non-reversible and non-adjustable.
On average, more than half of patients lose 70% or more of their extra weight and then start to maintain. Long-term success is dependent on accepting new rules for eating and food selection, which is taught in the follow-up period after surgery.
Advantages of Gastric Bypass
- Limits the amount of food that can be eaten at a meal and reduces the desire to eat.
- Average excess weight loss is generally higher than with gastric banding or sleeve gastrectomy.
- No postoperative adjustments are required.
- An analysis of clinical studies reported an average excess weight loss of 61.6% in 4,204 patients.
- Shown to help resolve type 2 diabetes, high blood pressure, and obstructive sleep apnea, and to help improve high cholesterol.
- In a study of 608 gastric bypass patients, 553 (91%) maintained contact for 14 years; the study reported that significant weight loss was maintained at 14 years.
Potential complications can include nausea/vomiting, a condition called dumping syndrome, and small bowel obstructions. As with any surgery, you should review your risks with your care team prior to your procedure.