The fields are being used to grow grains for animals as opposed to for human consumption. Or better yet, to grow vegetables for human consumption. The animals shouldn't even be eating grains in any significant amount. And perhaps what you say about how animals are fed is true worldwide, but here we grow low yield per acre, subsidized corn and use it for everything, but especially animal feed. go to a feed store and look at the feed. It's full of corn.
And B12 is made by bacteria. Something we once got more of. In addition a certain amount is made by the bacteria in our systems. Something we possibly had enough of to supply our B12 before our crappy diets and antibiotics. Especially when you consider that folate performs most of the functions of B12, so adequate sources of folate reduce the need for B12.
Also while chimps are omnivores and capable of hunting, they aren't very successful at it. Even those who've watched them poke sleeping bush babies with sharpened sticks have observed they aren't even good at that. Their diet is plant based.
This thread has become a whole lot of posts citing propaganda on both sides. Propaganda that is never quite correct. Humans are omnivores, but we and the planet would be so much better off if people ate a hell of a lot less meat so the massive corporate industrial farms would collapse and we could go back to small local farm sources that raise livestock in fields where they belong. Hopefully the higher fuel prices in a society that has for so long refused to find or adapt to alternatives is already helping this trend along.
Edited by alternativista, 02 April 2011 - 09:02 AM.