"Low levels of vitamin B12 linked to Alzheimer's" - New Scientist

The New Scientist reported today that "people with low levels of vitamin B₁₂ may be at greater risk of developing Alzheimer's disease. The finding supports previous research showing large doses of B vitamins might halve the rate of brain shrinkage."

"Although B₁₂ deficiency is common among elderly people, more evidence is needed before recommending B₁₂ supplements to stave off dementia, says Hooshmand".

http://www.newscientist.com/article/dn19184-low-levels-of-vitamin-b12-linked-to-alzheimers.html