A diagram illustrates gastric bypass surgery. One of the most common forms of bariatric surgery, the procedure creates a small pouch sewn out of the top of the stomach.

A diagram of how gastric bypass surgery rearranges your guts. BruceBlaus via Wikimedia Commons. It’s mainly this calorie restriction that helps patients shed pounds, ...

Carolyn Dawson, bariatric surgery patient looks at a diagram of her procedure at her surgeon Dr. Michael Snyder's office in Denver five days before her operation August 25, 2010.