as far as i know b12 is produced by a micro organism that happens to be very present in meat but not exclusivey. it also lives in the ground, and even in the human digestive system, only he body unfortunately can't take advantage of the B12 they produce. meat is just the easiers source of B12.
people used to get more b12 in the past as vegetables where much less cleaned after taking them from the soil and contained more B12 producing organisms.
that said it is a fact that being a vegetarian you have to make sure you eat a more varied diet to get all the esential building blocks you need ... than again wether you eat meat or not, you should do that anyway, meat contains many things that are bad for the body, so even when it can be quite healthy to consume some meat from time to time to much is definately bad for you.
anyway, i think everyone should figure out for themselves what's good for them, yet after 21 years as a vegetarian i still haven't found any good reason to turn back to meat.
in fact i keep finding more reasons not to eat it...
here's another thing to think about
:
Quote:
a kilogram of beef is responsible for the equivalent of the amount of CO2 emitted by the average European car every 250 kilometres, and burns enough energy to light a 100-watt bulb for nearly 20 days.
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http://environment.newscientist.com/...vironment.html
so checking out something vegetarian once in a while can help the planet more than turning of lightbulbs whenever you leave the room! (not that the later doesn't help as well of course)