Lactose IntoleranceLactaseLactose Tolerance TestLactoseFlatulenceLactase-Phlorizin HydrolaseDairy ProductsBreath TestsMilkHydrogenKwashiorkorMalabsorption SyndromesAbdominal PainCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose Intolerancebeta-GalactosidaseIntestine, SmallDiarrheaIrritable Bowel SyndromeDisaccharidasesGalactosidasesFructose IntoleranceSucrase