due to the aforementioned complications, instead of performing the intestinal bypass surgery, gastric bypass surgery is a more commonly used bariatric surgery nowadays. intestinal bypass surgery induces malabsorption by anastomosing proximal and distal small intestine. yet, the small intestine has an important role in performing a wide range of important physiological and metabolic functions, such as the metabolism of lipids. stomach, on the contrary, has a less significant role in the physiological and metabolic functions. the most prominent physiological function of the stomach is digestion, but the small intestine is also capable of digestion. thus, gastric bypass surgery does less harm to the overall metabolism of nutrients. gastric bypass leads to weight loss by controlling the appetite of the patients, instead of inducing malabsorption. as a result, the intestinal bypass is now replaced by an alternative of gastric bypass.