Bariatric surgeries cause weight reduction by confining the measure of sustenance the stomach can hold, causing malabsorption of supplements, or by a blend of both gastric confinement and malabsorption. Bariatric techniques likewise frequently cause hormonal changes. Most weight reduction medical procedures today are performed utilizing negligibly obtrusive systems (laparoscopic medical procedure).

The most widely recognized bariatric medical procedure strategies are gastric detour, sleeve gastrectomy, movable gastric band, and biliopancreatic redirection with duodenal switch