In order to rejoin the intestine, gastric surgeons have created a number of alternative gastric bypass (GBP) techniques. Any GBP results in a significant decrease in the stomach's functional volume, as well as a changed body's physiological and physical reaction to meals.

The procedure is recommended to address comorbid illnesses such type 2 diabetes, hypertension, sleep apnea, and morbid obesity (defined as a body mass index more than 40).

The term "bariatric surgery" refers to any surgical procedures used to treat morbid obesity, not just gastric bypasses, which are merely one type of such procedure. The resultant weight loss, which is frequently drastic, significantly lowers comorbidities.

It has been demonstrated that individuals who have gastric bypass have a 40% reduction in their long-term mortality rate. It's possible for difficulties to arise during surgery. According to a 2005–2006 study, problems after gastric bypass affect 15% of patients, and 0.5% of patients pass away within six months of having the procedure.