Low vitamin D levels may damage the brain

Researchers at the University of Kentucky have discovered that low vitamin D levels can lead to damage to the brain.   Certain proteins levels rise when low vitamin D levels occur, and these high levels of proteins can lead to free radical damage. Middle-aged rats that were given low levels  of vitamin D consistently performed lower on cognitive tests.
Vitamin D can be difficult to build into one's diet.   However, sunshine can help raise these levels.  We should get 10-15 minutes of sunshine each day to help raise these levels.

I found this interesting because it is finals week.  This gives us an excuse to take a break and enjoy the sunshine on a clear day.  Also, my great grandmother had Alzheimer's, and low levels of vitamin D has been linked to this disease.
http://www.medicalnewstoday.com/articles/269646.php