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Subjective well-being in older adults: folate and vitamin B12 independently predict positive affect

  • Laura C. Edney (a1), Nicholas R. Burns (a1) and Vanessa Danthiir (a2)


Vitamin B12, folate and homocysteine have long been implicated in mental illness, and growing evidence suggests that they may play a role in positive mental health. Elucidation of these relationships is confounded due to the dependence of homocysteine on available levels of vitamin B12 and folate. Cross-sectional and longitudinal relationships between vitamin B12, folate, homocysteine and subjective well-being were assessed in a sample of 391 older, community-living adults without clinically diagnosed depression. Levels of vitamin B12, but not folate, influenced homocysteine levels 18 months later. Vitamin B12, folate and their interaction significantly predicted levels of positive affect (PA) 18 months later, but had no impact on the levels of negative affect or life satisfaction. Cross-sectional relationships between homocysteine and PA were completely attenuated in the longitudinal analyses, suggesting that the cross-sectional relationship is driven by the dependence of homocysteine on vitamin B12 and folate. This is the first study to offer some evidence of a causal link between levels of folate and vitamin B12 on PA in a large, non-clinical population.

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* Corresponding author: L. C. Edney, email


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Subjective well-being in older adults: folate and vitamin B12 independently predict positive affect

  • Laura C. Edney (a1), Nicholas R. Burns (a1) and Vanessa Danthiir (a2)


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