intestinal bypass is a bariatric surgery performed on patients with morbid obesity to create an irreversible weight loss, when implementing harsh restrictions on the diets have failed. jejunocolic anastomosis was firstly employed. nonetheless, it led to some unexpected complications such as severe electrolyte imbalance and liver failure. it was then modified to jejunoileal techniques. viewed as a novel form of treatment for obesity, many intestinal bypass operations were carried out in the 1960s and 1980s<.ref name=":1" /> significant weight loss was observed in patients, but this surgery also resulted in several complications, for instance, nutritional deficiencies and metabolic problems. due to the presence of surgical alternatives and anti-obesity medications, intestinal bypass is now rarely used.