According to the World Health Organization (WHO), the average life expectancy in the United States is set to rank well behind many other nations by
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The Oxford study found that people who had higher vitamin B12 levels were six times less likely to experience brain shrinkage compared with those who had lower levels of the vitamin in their blood. None of the people in the study had vitamin B12 deficiency. The study was conducted over five years and published in the journal of Neurology.