Low levels of vitamin D increase the risk of cognitive impairment in the elderly, according to findings from the nationally representative British survey.
Researchers studied more than 1750 adults aged 65 or older. Blood samples were taken from them to measure circulating vitamin D levels, and their cognitive function was measured using the Abbreviated Mental Test, which includes 10 questions to assess attention, orientation in time and space, and memory.
The researchers found a significant association between lower levels of vitamin D and cognitive impairment. Older adults with the lowest levels of vitamin D were more than twice as likely to be cognitively impaired as those with the highest levels.
Reuters February 5, 2009