Lactose IntoleranceLactaseLactose Tolerance TestLactoseFlatulenceDairy ProductsBreath TestsLactase-Phlorizin HydrolaseHydrogenMilkKwashiorkorMalabsorption SyndromesAbdominal PainCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose IntoleranceLactose SynthaseDiarrheaIntestine, SmallIrritable Bowel SyndromeFructose Intolerancebeta-GalactosidaseLactose Factors