Really? How well do you process grass? I'd say you're lying. there is
no way that you can convert grass to protein to keep yourself alive. A cow
can and does just that, and makes for a delicious steak when done...

Let me preface this with saying I am neither vegan nor vegetarian. While
humans cannot process grass into protein(and maybe they can, I just do no
have the time to research this) there are other grains and beans that we can
such as soy. Soy, per pound, provides more protein than beef(and with less
health risks too). Soy is often used as feed for farm animals because of
its inexpensive nature to be produced.

It is a very simple fact that each level of processing(i.e., cow eats soy,
we eat cow) sacrifices some of the nutrients and energy in the food. If
some creature above us were to eat us, they would only gain a partial
benefit of what we gained from the cow.

Christopher