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Vitamin B6 Is Associated with Depressive Symptomatology in Massachusetts Elders

Objective: We examined the cross-sectional relationship between dietary vitamin B6 and plasma pyridoxyl-5′-phosphate concentrations (PLP) with depressive symptomatology among a representative sample of 618 elderly Caribbean Hispanics, and a neighborhood based comparison group of 251 non-Hispanic white (NHW) older adults in Massachusetts. Methods: Depressive symptomatology was assessed with the Center for Epidemiologic Studies Depression Scale (CES-D). 41% of Hispanics and 22.6% of NHWs had CES-D scores greater than 16, indicating depressive caseness. Dietary intake was calculated from a semi-quantitative food frequency questionnaire (FFQ) designed for this population. Results: PLP was significantly associated with CES-D score and depressive caseness in the total sample and in non-supplement users. Deficient levels of plasma PLP (plasma PLP < 20 nmol/L) approximately doubled the likelihood of depressive caseness. Total intake (diet + supplement) of vitamin B6 was not associated with these outcomes. However, dietary vitamin B6 was significantly associated with CES-D score and depressive caseness. Conclusion: Longitudinal studies are needed to clarify the direction of causality between vitamin B6 and depressive symptoms.