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- Exposure to sunlight
There are no studies linking solar radiation to cognitive function; however, solar ultraviolet-B (UVB) is the primary source of vitamin D for most people.
On the other hand, the efficiency of production of vitamin D from UVB decreases dramatically with age1, and older people, who are more likely to develop cognitive impairment, tend to spend less time out of doors than younger people.
Page last edited: 09 May 2011
- MacLaughlin, J. Holick, M. F. Aging decreases the capacity of human skin to produce vitamin D3. J Clin Invest. 1985 Oct; 76 (4): 1536-8.