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The finding is based on an analysis of more than 70 studies.
"Our work counters an emerging belief held in some quarters suggesting that higher levels of vitamin D can impact positively on brain health," said study author Krystal Iacopetta, a Ph.D. candidate at the University of Adelaide, in Australia.
"Past studies had found that patients with a neurodegenerative disease tended to have lower levels of vitamin D compared to healthy members of the population," she explained in a university new release.
"This led to the hypothesis that increasing vitamin D levels, either through more UV [ultraviolet] and sun exposure or by taking vitamin D supplements, could potentially have a positive impact. A widely held community belief is that these supplements could reduce the risk of developing brain-related disorders or limit their progression," Iacopetta said.
"The results of our in-depth review and an analysis of all the scientific literature, however, indicates that this is not the case and that there is no convincing evidence supporting vitamin D as a protective agent for the brain," she said.
Study co-author Mark Hutchinson added, "We've broken a commonly held belief that vitamin D resulting from sun exposure is good for your brain."
While vitamin D is essential for health, it "is not going to be the miracle 'sunshine tablet' solution for brain disorders that some were actively hoping for," said Hutchinson, who is a professor at the University of Adelaide.
The study was published July 10 in the journal Nutritional Neuroscience.
-- Robert Preidt
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