Patient-Friendly Explanation

Roux-en-Y gastric bypass is a type of weight loss surgery that creates a small stomach pouch and reroutes the small intestine to it, so you feel full with much less food and absorb fewer calories. It is one of the most effective surgical treatments for severe obesity, typically resulting in 25-35% total body weight loss.

Clinical Definition

Roux-en-Y Gastric Bypass (RYGB) is a malabsorptive-restrictive bariatric procedure involving the creation of a small gastric pouch (15-30 mL) from the proximal stomach, which is anastomosed to a Roux limb of jejunum, bypassing the gastric remnant, duodenum, and proximal jejunum. Mechanism includes restriction, malabsorption, and favourable changes in gut hormones (increased GLP-1 and PYY, decreased ghrelin). Mean excess weight loss at 5 years is 60-70%.

Why It Matters

Gastric bypass is reserved for patients with severe obesity (BMI ≥40 or BMI ≥35 with comorbidities) who have not achieved sufficient weight loss through medical management. At NuLifeCare, Dr. Joseph Wang provides comprehensive pre- and post-operative support for bariatric surgery patients, working alongside surgical teams to ensure safe and lasting outcomes.