Lactose IntoleranceBreath TestsLactose Tolerance TestLactaseFlatulenceLactoseDairy ProductsHydrogenLactase-Phlorizin HydrolaseMilkMalabsorption SyndromesKwashiorkorAbdominal PainCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose IntoleranceIntestine, SmallIrritable Bowel SyndromeHelicobacter InfectionsHelicobacter pyloriDiarrheaLactuloseGastric EmptyingUreaCarbon IsotopesFructose Intolerancebeta-GalactosidaseFecesAminopyrineOrthostatic IntoleranceCaprylatesLactose Synthase