Actually chaps we are omnivores not carnivores
http://en.wikipedia.org/wiki/Omnivore
We actually do not need to eat meat at all, but if you must you really only should eat it a maximum of twice a week plus fish once or twice.
I became a vegetarian because the person I moved in with was one and I really couldn't be bothered to cook two different meals, that was over 20 years ago and to be honest I have been so much more healthy since I stopped eating meat.
However each to their own preference, provided food animals are treated well then knock yourself out