Folic AcidFolic Acid DeficiencyNeural Tube DefectsDietary SupplementsDietary FatsFood, FortifiedTetrahydrofolatesHomocysteineVitamin B ComplexVitamin B 12DietFolic Acid AntagonistsPreconception CareDietary ProteinsDietary FiberFolate Receptors, GPI-AnchoredHyperhomocysteinemiaDietary CarbohydratesVitamin B 6Anemia, MacrocyticHematinicsVitaminsPregnancyPteroylpolyglutamic AcidsVitamin B 12 DeficiencyBreadFolic Acid Transporters