<unk>  is the term used to describe a decline in the level of<unk> , an enzyme needed for proper metabolization of<unk>  (a sugar that is a constituent of milk and other dairy products), in human beings.
Lactose intolerance
Sucrose intolerance
Glucose-galactose malabsorption
Hereditary fructose intolerance
Bile acid malabsorption
Acid indigestion
Fecal impaction
Peanut allergy