I might suggest using the "Mirror Test" recently in the news to decide what you should or shouldn't eat.
If an animal can recognise itself in a mirror (and very few do) then it can be described as self aware and maybe shouldn't be eaten.
So that cuts out a few types of monkey, elephants, dolphins and humans from a meat eaters diet! Nearly everything else is fair game!
(Note: Human children tend to fail this test until they are at least 1.5 to 2 years old)
Link to Mirror Test Wiki page
And I should add that I am in fact a vegitarian, but not the evangelical type! [img]/images/graemlins/wink.gif[/img]