Roux-en-Y gastric bypass
Creates a small stomach pouch and reroutes a portion of the small intestine (a 'Y'-shaped configuration). Extensive published data on weight and metabolic outcomes, including type 2 diabetes remission in some patients.
How it works
- A small stomach pouch is separated from the rest of the stomach.
- A limb of small intestine is brought up and connected to the new pouch.
- Combines restriction, malabsorption, and neurohormonal effects.
Risks and considerations
- Standard surgical risks
- Dumping syndrome after high-sugar meals
- Marginal ulcer
- Nutritional deficiencies — iron, B12, calcium, vitamin D — requiring lifelong supplementation
- Internal hernia (uncommon; requires urgent evaluation if suspected)
Follow-up
Lifelong nutritional monitoring and annual labs are standard.
May be discussed for
- Adults living with obesity, particularly those with type 2 diabetes or severe reflux
- Patients seeking the longest-established metabolic benefits data
When it may not be appropriate
Patients with certain absorption disorders or medication requirements affected by malabsorption may need alternatives.
Dr. Ariel Ortiz Lagardere, MD, FACS, FASMBS
Bariatric & Metabolic Surgeon · Founder, Obesity Control Center
- Content reviewed
- Educational overview of Roux-en-Y gastric bypass.
- Last reviewed
- 2026-06-01
See our medical review policy, editorial policy, and references.
Dr. Ariel Ortiz Lagardere, MD, FACS, FASMBS
Bariatric & Metabolic Surgeon · Founder, Obesity Control Center
Last reviewed: June 2026
Educational claims on this page are supported by independent guidelines, peer-reviewed evidence, and verifiable accreditation listings. See Sources & Verification and Science & Evidence.
Medical notice. This content is educational only and does not replace professional medical advice. Do not start, stop, or change GLP-1 medication without consulting your physician.