Please keep responding to the poll!
So far, only one person has selected the "Yes, with serious, non-curable symtoms (eg. neurological damage)"-option, and that was a person who got these problems before going vegan.
For those interested, here's an article from 2008 about "reversible cognitive impairment and P3 abnormalities in B12 deficiency neurological syndromes": http://www.ncbi.nlm.nih.gov/pubmed/18350363
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