Lactose IntoleranceLactoseCeliac DiseaseLactose Tolerance TestLactaseFlatulenceDietary CarbohydratesDairy ProductsBreath TestsGlutensLactase-Phlorizin HydrolaseHydrogenMilkGliadinDiet, Gluten-FreeKwashiorkorMalabsorption SyndromesCalcium, DietaryAbdominal PainNational Institute of Mental Health (U.S.)Intestine, SmallGlucose IntoleranceTransglutaminasesDiarrheaIrritable Bowel SyndromeDietary FatsReticulinDermatitis HerpetiformisFructose IntoleranceDuodenumbeta-GalactosidaseImmunoglobulin AJejunumDietDietary ProteinsIntestinal MucosaFeces