Lactose IntoleranceLactoseLactose Tolerance TestMalabsorption SyndromesLactaseFlatulenceBreath TestsDietary CarbohydratesDairy ProductsHydrogenLactase-Phlorizin HydrolaseMilkKwashiorkorCalcium, DietaryAbdominal PainNational Institute of Mental Health (U.S.)Glucose IntoleranceIntestine, SmallDiarrheaFructose IntoleranceIntestinal AbsorptionSprue, TropicalLactose SynthaseDietary FatsIrritable Bowel SyndromeFecesbeta-GalactosidaseSchilling TestDietDietary ProteinsLactose FactorsCeliac Disease