<unk> , formerly named dietary<unk>  intolerance (DFI), is a digestive disorder in which absorption of<unk>  is impaired by deficient<unk>  carriers in the small intestine's enterocytes. This results in an increased concentration of<unk>  in the entire intestine. Intolerance to<unk>  was first identified and reported in 1956. Occurrence in patients identified to be suffering symptoms of irritable bowel syndrome is not higher than occurrence in the normal population. However, due to the similarity in symptoms, patients with<unk>  often fit the profile of those with irritable bowel syndrome. In some cases,<unk>  may be caused by several diseases which cause intestinal damage, such as celiac disease.<unk>  is not to be confused with hereditary<unk>  intolerance, a potentially fatal condition in which the liver enzymes that break up<unk>  are deficient.
Fructose malabsorption
Glucose-galactose malabsorption
Sucrose intolerance
Lactose intolerance
Bile acid malabsorption
Exocrine pancreatic insufficiency
Lysinuric protein intolerance
Small intestinal bacterial overgrowth