That explains it, then.
More seriously, this article did not make me reach for a steak. It's perfectly easy to get enough B12 by using nutritional yeast, plus if you're me, eating non-vegan food that your relatives slip you on the grounds that what you don't know won't hurt you.
You should be using nutritional yeast anyway because it has a lovely, savory flavor. Particularly recommended in pesto to substitute for the parmesan cheese, and in your breakfast tofu scramble.
This article available online at:
http://www.theatlantic.com/business/archive/2008/09/vegetarians-and-their-tiny-little-brains/4103/
