What is the definition of gastric bypass surgery?

Gastric bypass surgery, also known as Roux-en-Y gastric bypass (RYGB), is a surgical procedure that involves creating a small stomach pouch and connecting it directly to the small intestine, bypassing the majority of the stomach and the first part of the small intestine. This alters the way food is digested and absorbed, leading to weight loss and the resolution or improvement of related health conditions.