Contrary to many people's personal beliefs about their own food preferences, tooth and mouth structure studies have shown that we are actually "fruit-tarians". Of course, meat eaters will disagree. It doesn't matter. Our "species" eats everything, because it can. And we die younger, because some foods kill us.
Interestingly, the Bible declares we were all strict vegetarians for the first couple thousand years, and after the flood, due to lack of plant material, people ate the extra "clean" animals carried on the ark for that purpose and God declared meat was then part of the diet.
As a vegetarian, though, it is obvious that we do not need to be omnivorous.