Bariatric surgeries cause weight misfortune by limiting the measure of sustenance the stomach can hold, causing malabsorption of supplements, or by a blend of both gastric confinement and mal-absorption. Bariatric strategies additionally regularly cause hormonal changes. Most weight misfortune medical procedures today are performed utilizing insignificantly obtrusive methods (laparoscopic surgery). The essential guideline of bariatric surgery is to confine nourishment admission and abatement the assimilation of sustenance in the stomach and digestion tracts. The assimilation procedure starts in the mouth where nourishment is bitten and blended with salivation and other compound containing emissions. The sustenance at that point achieves the stomach where it is blended with stomach related squeezes and separated so supplements and calories can be assimilated. Assimilation at that point turns out to be quicker as sustenance moves into the duodenum (initial segment of the small digestive tract) where it is blended with bile and pancreatic juice. Bariatric surgery is intended to adjust or interfere with this absorption procedure so nourishment isn't separated and assimilated in the typical manner. A decrease in the measure of supplements and calories assimilated empowers patients to get in shape and decline their hazard for obesity-related wellbeing dangers or disarranges. The most widely recognized bariatric surgery strategies are gastric detour, sleeve gastrostomy, movable gastric band, and biliopancreatic redirection with duodenal switch.