What is gastric bypass?
Stomach pouch created and connected to a section of small intestine, restricting intake and absorption.
What is gastric bypass?
Stomach pouch created and connected to a section of small intestine, restricting intake and absorption.
Also known as
- roux-en-y
- rny
Quick facts
200,000+
annual US gastric bypass procedures (currently fewer than sleeve)
70–80%
of excess weight lost at 1 year
0.1–0.5%
perioperative mortality at Centers of Excellence
Common reasons people choose this procedure
Approaches and motivations vary by surgeon and patient anatomy. Compare techniques and real outcomes on the main Gastric Bypass page.
Alternatives
Gastric sleeve (VSG)
Simpler surgery, fewer long-term complications, fewer nutrient deficiencies. Slightly less weight loss than bypass at 5+ years.
Duodenal switch / SADI-S
More aggressive than bypass. Better for very high BMI. More malabsorption, more nutrient deficiencies.
GLP-1 medications (Wegovy, Zepbound)
No surgery; lifelong medication. Comparable weight loss for many but high regain after stopping.