Bariatric surgery
![Biliopancreatic Diversion.](/Images/godic/202501/14/Biliopancreatic_Diversion1630.png")
![Diagram of a biliopancreatic diversion.](/Images/godic/202501/14/Biliopancreatic_diversion1630.png")
![Diagram of a vertical banded gastroplasty.](/Images/godic/202501/14/Vertical_banded_gastroplasty1630.png")
![Diagram of an adjustable gastric banding.](/Images/godic/202501/14/Adjustable_gastric_banding1631.png")
Bariatric surgery (weight loss surgery) includes a variety of procedures performed on people who have obesity. Weight loss is achieved by reducing the size of the stomach with a gastric band or through removal of a portion of the stomach (sleeve gastrectomy or biliopancreatic diversion with duodenal switch) or by resecting and re-routing the small intestine to a small stomach pouch (gastric bypass surgery).