Validity of brief food frequency questionnaire for estimation of dietary intakes of folate, vitamins B₆and B₁₂, and their associations with plasma homocysteine concentrations

Abstract

Positive correlations between dietary intakes estimated from our brief FFQ and serum concentrations for folate and vitamin B(12) as well as negative correlations between dietary intakes and plasma homocysteine concentrations suggest the usefulness of this questionnaire.