This seems to be based on crappy science. Although studies show that low vitamin D status is linked to poorer cognitive abilities, studies also show that vitamin D supplementation has no effect whatsoever on cognitive abilities.
Most likely it is another factor causing both the lower vitamin D status as well as cognitive decline (such as lack of outdoor exercise).
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[ 3.2 ms ] story [ 14.2 ms ] threadMost likely it is another factor causing both the lower vitamin D status as well as cognitive decline (such as lack of outdoor exercise).