B12, brain shrinkage and Alzheimer's disease

Vitamin B12, may protect against brain shrinkage in older people, according to a new study published on 9th September in the journal Neurology.

University of Oxford scientists examined 107 people between the ages of 61 and 87 and found that people with lower vitamin B12 levels were six times more likely to experience brain shrinkage, which can cause memory loss, compared with those with higher levels of the vitamin in the blood.

(The above info is extracted from:
http://alzheimers.org.uk/site/scripts/news_article.php?newsID=335)

In Alzheimer's disease, there is an overall shrinkage of brain tissue.

(The above info is extracted from:
http://www.ahaf.org/alzheimers/about/understanding/brain-with-alzheimers.html)