Lactose IntoleranceLactaseLactose Tolerance TestLactoseFlatulenceDairy ProductsBreath TestsLactase-Phlorizin HydrolaseHydrogenMilkKwashiorkorAbdominal PainMalabsorption SyndromesCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose IntoleranceDiarrheaIrritable Bowel SyndromeIntestine, Smallbeta-GalactosidaseFructose Intolerance