No sensible vegetarians can contest that we were deigned to eat meat. Even most vegan scientists agree that human's are designed to eat meat, that is not in question.
That we do not have claws, talons, or incisors to hunt proves nothing. When early hominids ate meat they scavenged it, as vultures do, using their fingers to get the sinews and meat other animals couldn't. It was only after that that they began to hunt the meat themselves, and only much later they began to cook it. It is interesting that even now if someone was brought up eating raw meat he would have no problem with it.
The last few million years of human evolution have revolved completely around tools. We used advanced stone tools long before we began to hunt our own meat, and as such there was no need for evolution to bestow us with large claws or teeth to kill prey.
Simple research into human biology reveals how we are meant to eat meat. For one thing, our body produces hydrochloric acid and meat splitting enzymes that herbivores don't produce and are solely used for the digestion of meat. There are adaptations to our teeth (not incisors, rather the size of the jaw), stomach and intestines which have made a human being very adept at meat digestion. There is nothing wrong with the way our body digests meat, and we are so adept at eating it no scientists are of any doubt we've evolved to eat it.
In contrast, there are many reasons we aren't naturally herbivores. We cannot naturally get all the nutrients we need without animal products naturally. Vitamin B12 cannot be got, even now, without animal products or supplements, and a lack of it can cause anaemia and impending death. 60% of vegans even now have some level of B12 deficiency, as opposed to no meat eaters, which says something about how well adapted we are to a vegan diet.
All other nutriets can be got natually. That owes to that vegtables can now be sold all year round, even out of season, and can be flown into the country from all over the world. In bygone times people could only eat the relatively small range of plants that grew in their ecosytem, and only when they were in season. Thus many more nutrients would have been unavailable and still more unavaillable for most of he year. Until very recently it would have been impossible for a vegan human to live naturally without dying very quickly.
Now, meat makes up for all these lost nutrients very nicely, and it really shows how we aren't naturally vegans, as until very recently it was impossible to live like that.
@ Beebs
Our opposable thumbs were designed for gripping trees, but they later became bloody useful for holding spears.
Also, don't generalise 'meat-eaters' based on the order 'carnivora' which contains most meat eating mammals like cats and dogs. They are very closely related to each other, and as primates we are not, so it is no great surprise we are not very much like them, but that doesn't affect our ability and design to eat meat.
Also, when humans did have to catch their own meat, and it was only a few centuries ago when most people lived in the countryside and would have often have to have caught, killed and butchered their own meat, there were pretty much no vegetarians around.