[cnn.com] There’s been a lot of buzz about vitamin B12 in recent years, and here’s another reason to pay attention to it: A new study finds that a deficiency in vitamin B12 is associated with memory and thinking problems, as well as brain shrinkage. The research is published in the journal Neurology. Researchers did not prove that low vitamin B12 levels cause these cognitive abnormalities, but they did find a strong association with markers of deficiency, said study co-author Dr. Martha Morris of the Rush University Medical Center in Chicago. The theory is that adequate levels of vitamin B12 is necessary for the brain’s myelin sheath, an insulating layer around
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