Folic AcidFood, FortifiedNeural Tube DefectsVitamin B ComplexBreadFolic Acid DeficiencyFlourVitamin B 12 DeficiencyCerealsVitamin B 12HomocysteineDietary SupplementsAnemia, MacrocyticHomocystineNutrition PolicySpinal DysraphismEncephaloceleNutritional RequirementsNutritional StatusNutrition SurveysPrenatal CarePregnancyErythrocytesUnited StatesHematinicsTetrahydrofolatesInfant, NewbornPrevalencePreconception CareIron, DietaryAnemia, Iron-DeficiencyFolic Acid AntagonistsMicronutrientsCondimentsIncidenceHyperhomocysteinemiaBiological AvailabilityVitamin B 6TriticumIronFolate Receptors, GPI-AnchoredDietVitaminsPteroylpolyglutamic AcidsPrenatal Nutritional Physiological PhenomenaMethylenetetrahydrofolate Reductase (NADPH2)Double-Blind MethodAnencephalyFerrous CompoundsFolic Acid TransportersAnemia, HypochromicVitamin AIron CompoundsHemoglobinsIntestinal AbsorptionFood AnalysisMethylmalonic AcidNutritive ValueGuatemalaAbsorptionZincPhytic AcidIodineFood HandlingVoluntary ProgramsFood TechnologyInfant FoodFerric CompoundsFolate Receptor 1RiboflavinFerritinsInfant Nutritional Physiological PhenomenaFormyltetrahydrofolatesUzbekistanZea maysAminopterinFood-Processing IndustryVitamin A DeficiencyEdetic Acid