Skip to main content

Roux-en-Y gastric bypass surgery

  • Roux-en-Y gastric bypass surgery decreases the size of the stomach and the ability to absorb calories. The stomach is stapled and then divided, making two different sections: A small new pouch, and the bypassed stomach. Part of the small intestine is then separated and attached to the pouch. This surgery helps limit the amount of food and liquid the stomach can hold at one time, causing you to feel full sooner. Weight loss occurs because fewer calories are taken in and absorbed. Weight loss is usually rapid.


    • Rapid weight loss
    • Highest frequency for resolution of co-morbid conditions


    • Higher potential for nutrition deficiencies
    • Some people experience dumping syndrome

    Procedure video

  • Source: Allina Health's Patient Education Department, Roux-en-Y Gastric Bypass Surgery: What You Need to Know Before and After Surgery, fourth edition, surg-ahc-90091
    Reviewed by: Stacy Erstad, PA-C, MPAS, Allina Health Weight Management
    First published: 01/21/2005
    Last reviewed: 09/04/2017