Duodenal switch (otherwise referred to as BPD with Duodenal switch) is a laparoscopic procedure that induces weight loss by restricting both food intake and the amount of calories and nutrients the body absorbs. With this procedure, the surgeon removes approximately 60 percent of the stomach leaving it shaped like a tube. The lower intestine is then divided much further downstream than with the gastric bypass. The outlet muscle that controls emptying of the stomach is preserved.

Unlike gastric bypass or adjustable gastric banding, this procedure allows one to eat larger portions. Duodenal switch induces a state of decreased absorption, sometimes causing frequent bowel movements. While this operation is reliable and weight loss is long-lasting, vitamin, mineral and protein levels must be closely monitored.

Patients report weight loss of 80-90% (or more) of excess body weight. Super morbidly obese patients (50 or greater BMI), should consider this weight loss procedure.