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After correcting for body mass index, there was a 5% decrease in the amount of serum vitamin B12 concentrations from 0 to 1 drink/d treatment. Alcohol intake had no significant effects on serum folate or MMA and HCY concentrations. Among healthy, well-nourished, postmenopausal women, moderate alcohol intake may diminish vitamin B12 status.
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Just as mercury may cause B12 deficiency in the nervous system, so alcohol can cause deficiency in tissues. Even worse, alcohol seems to raise serum levels of vitamin B12, so that the deficiency is masked and the subject may look like they have higher than normal B12 levels! Whether these effects correlate to alcohol intake, or are only found in "alcoholics" is not clear.
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