"mch" > wrote in message
...

> Is it said how much meat is necassary to eat so as not to suffer B12
> deficiency?
None!! Supplements are cheap and readily available. There is also B-12
in plants. And, there is no evidence that veg*ns, in general, have any B-12
issues.
http://www.ecologos.org/B-12.htm

Laurie