<unk>  or genetic<unk> -isomaltase deficiency (GSID) is the condition in which<unk> -isomaltase, an enzyme needed for proper metabolism of<unk>  (sugar) and starch (e.g., grains), is not produced or the enzyme produced is either partially functional or non-functional in the small intestine. All GSID patients lack fully functional<unk> , while the isomaltase activity can vary from minimal functionality to almost normal activity. The presence of residual isomaltase activity may explain why some GSID patients are better able to tolerate starch in their diet than others with GSID.
Sucrose intolerance
Lactose intolerance
Fructose malabsorption
Glucose-galactose malabsorption
Saccharopinuria
Hereditary fructose intolerance
Bile acid malabsorption
Chyluria