Got milk? No thanks! Up to 20% of Americans believe they're lactose intolerant. Just how intolerant varies with the person and the food.
D000818:Animals; D006801:Humans; D043322:Lactase / Q000172:deficiency*; D007787:Lactose Intolerance / Q000209:etiology* / Q000378:metabolism; D008892:Milk
D043322:Lactase