Aging: Vitamin D Levels Tied to Dementia Risk

Low blood levels of vitamin D may be associated with an increased risk for dementia, a British study has found.

Scientists measured blood levels of the vitamin in a representative sample of 1,766 people over 65 and assessed their mental functioning with a widely used questionnaire. About 12 percent were cognitively impaired, and the lower their vitamin D level, the more likely they were to be in that group. Compared with those in the highest one-quarter for serum vitamin D, those in the lowest were 2.3 times as likely to be impaired, even after statistically adjusting for age, sex, education and ethnicity. Men showed the effect more strongly than women.

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