Lactose IntoleranceIrritable Bowel SyndromeLactose Tolerance TestLactaseFlatulenceLactoseColonic Diseases, FunctionalDairy ProductsBreath TestsLactase-Phlorizin HydrolaseAbdominal PainHydrogenMilkKwashiorkorMalabsorption SyndromesDiarrheaCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose IntoleranceConstipationIntestine, SmallInflammatory Bowel DiseasesFructose IntoleranceGastrointestinal Agentsbeta-GalactosidaseFecesGastrointestinal TransitDefecationOrthostatic IntolerancePrevalenceGastrointestinal MotilityLactose SynthaseHypnosis