Mini Gastric Bypass (OAGB)
A simplified weight loss surgery using a single connection to reduce stomach size and calorie absorption.
Plain English
Patient-Friendly Explanation
The Mini Gastric Bypass, also called One Anastomosis Gastric Bypass (OAGB), is a simpler weight loss surgery that creates a smaller stomach pouch and reroutes part of the small intestine. This helps you feel full with less food and reduces calorie absorption. It takes less time to perform than traditional gastric bypass and has shown excellent long-term weight loss results.
Medical
Clinical Definition
One Anastomosis Gastric Bypass (OAGB) involves creating a long, narrow gastric pouch along the lesser curvature and anastomosing it to a loop of jejunum approximately 150-200 cm distal to the ligament of Treitz. This achieves both restriction and malabsorption with a single anastomosis, reducing operative time and potential leak sites compared to Roux-en-Y gastric bypass. Systematic reviews show mean excess weight loss of 70-80% at 5 years, comparable to or exceeding RYGB outcomes.
Key Insight
Why It Matters
For patients considering weight loss surgery, understanding all available options — including the Mini Gastric Bypass — is essential for making an informed choice. Dr Joseph Wang at Accord Medical Clinic can explain the risks, benefits, and suitability of each bariatric procedure for your specific health profile.
Sources
Reviewed against standard medical references.
Medically reviewed by
Family Physician & Registered Acupuncturist, Accord Medical Clinic. MBBS (NUS), Graduate Diploma in Family Medicine (NUS), Graduate Diploma in Acupuncture (Singapore College of TCM).
Last reviewed: August 2026
This page is general health education, not medical advice. Whether any treatment is appropriate for you is a decision made in consultation after assessment.