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Piso--
I'm not sure what you mean when you say when that the body can process 80grams of protien of protien "at once." Can you explain that?
But I think your point is that if people eat only enough meat to satisfy their body's protien demands... then the energy expendature for production of needed meat vs. needed produce comes out the same. I haven't done the math on that but it's not a fair comparison anyway. THe body need more than protien... and meat only gives protein and fat. Soy gives you protien, fat, and carbs. So you can't just do a protien lb for lb comparison. But in any case, here's the problem..
Most all people in developed countries eat way more meat than they would ever need. The body only needs about 50-80 grams of protien a day (depending on your size). Now even if meat were the only source of protien available, the average person would still only need a few oz of meat a day. But the average American probably eats like 5x as much meat as anyone would need (even if it was their only source of protien... which it never is!).
And also... it doesn't matter if the grass the cattle eat is not fertilized. The cows poop! What do you think that is? Plants don't poop... even better, they produce oxygen.
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