Malabsorption SyndromesStomachLactose IntoleranceSprue, TropicalIntestinal AbsorptionLactose Tolerance TestSchilling TestIntrinsic FactorStomach NeoplasmsCeliac DiseaseJejunumBreath TestsXyloseVitamin B 12Proton-Coupled Folate TransporterHydrogenFructose IntoleranceStomach DiseasesCobalt IsotopesExocrine Pancreatic InsufficiencyLactuloseIntestine, SmallVitamin B 12 DeficiencyFatsLactoseShort Bowel SyndromeIntestinal DiseasesDiarrheaPancrelipaseBile Acids and SaltsFecesGastric MucosaStomach UlcerPancreatic ExtractsDuodenumAchlorhydriaAnemia, MegaloblasticAnemia, PerniciousPostgastrectomy SyndromesIleumGlutensTrioleinAnemia, MacrocyticBlind Loop SyndromeMilkSelenium RadioisotopesGastrectomyFructoseIntestinesGlycocholic AcidCarbohydrate Metabolism, Inborn ErrorsJejunoileal BypassJejunal DiseasesGastrointestinal TransitIntestinal MucosaPancreatinFolic Acid DeficiencyGastrointestinal MotilityFolic AcidAbsorptionGastrointestinal DiseasesLactaseYogurtGiardiasisGlucose Transporter Type 5Gastric JuiceDietary FatsPancreatic DiseasesFood Service, HospitalDiet, Gluten-FreeBiliopancreatic DiversionTaurocholic AcidSodium-Glucose Transporter 1Dietary CarbohydratesSorbitolCystic FibrosisPancreatic Function TestsNutrition DisordersFatty Acids, EssentialDiet TherapyCholestyramine ResinDermatitis HerpetiformisHIV Wasting SyndromePyloric AntrumTechnetium Tc 99m Diethyl-iminodiacetic AcidIndependent State of SamoaIntestinal SecretionsCobalt RadioisotopesColonic Diseases, FunctionalBiopsyEnteritisGastric BypassWhipple DiseaseIntubation, GastrointestinalSteatorrheaParenteral Nutrition, HomeFructose Metabolism, Inborn ErrorsOsteomalaciaTuberculosis, GastrointestinalStomach Rupture