From an evolutionary viewpoint, humans are omnivores; neither strictly vegetarian nor carnivorous.
The key, as you may perhaps be intimating, is in our dentition. We have incisors and molars for dealing with roots and grains, but we also have, (drum-roll please), canines.
Just from this survey, it would appear that we are “intended” to consume a modest amount of meat, during at least some times, perhaps of hardship, but that most of our diet should not be “fast food”.
Also, what about our digestive system. The Doc in the last article I read doesn't seem to think that we should eat meat because our track can't handle it. And our body can develop disease from it. I don't believe all that. I had gizzards tonight, just in case one might ask about my diet. I am a firm believer that there is room for all God's creatures, right next to my mashed taters.