We can say many things about "the orgininal diet" of Man and what's optimal nutrition for mankind, that's because we can litterally dump whatever we want in our stomach like in a trashcan and it will digest. But that's not optimum at all.
The fact that we can eat only meat, or only plant-based foods, or both, does not mean we are omnivores by nature. The true omnivores on the planet are very rare, the dog and the bear are omnivores. Humans are frugivores. The diet perfect for us consist of fruits, nuts and greens. 
To know what's optimum between a carnivorous diet and a vegan diet, compare the general health and athletic level of Eskimos or Inuits, who have a short life  and the highest rate of osteoporisis on the planet; compare with vegans and fruitarians, who include gold medalists  athletes like Carl Lewis (see my blog on this matter

Micheal BlueJay writes : "Human performance is highest on meat-free diets

Vegetarian and vegan athletes are at the top in their sports. Carl Lewis, the runner, won nine Olympic gold medals. Lewis says that he had his best performance as an athlete after he adopted a vegan diet.

The famed bodybuilder, Andreas Cahling, is also vegan. Ditto for former Mr. USA and Mr. America, Jim Morris.

Ruth Heidrich, a vegan Ironman triathlete and marathon runner has racked up more than 700 first-place trophies and set several performance records. She was also named One of the 10 Fittest Women in North America.

Of course it's true that most athletes eat meat, but that's because most people eat meat. Given how well vegetarian athletes perform, meat-eating athletes would undoubtedly perform even better if they ate less animal foods. And while reliable statistics are hard to come by, there is little doubt that athletes in general have been moving towards vegetarianism in large numbers over the past twenty years."
...- Micheal BlueJay.
On his website he talks about all the clichés that omnivores have towards vegans. His text summarize about pretty much everything there is know on this subject.

Finding what's optimal for us helps to know what we're biologically designed for, therefore what's optimal to achieve the highest level of physical and intellectual performances.
A carnivorous defender may claim that we have canines to tear meat. Truth is, look at the dentition of cats, wolves, any carnivorous animals, then look at ours. We have nothing even ressembling like canines, except how it's named, simply because of the emplacement of those teeth. Secondo : teeth don't mean anything, look at the immense canines of gorillas, don't tell me this is to eat meat. (see my post about dentition)

It is obvious to me that we aren't optimized nor designed to eat meat.
If we look at our body, there's absolutly nothing particulary agressive about it. We don't have a predator body. We look pretty pathetic beside panthers, wolves and crocodiles. Our teeth, hands and fingernails are innoffensive, compared to animal claws and teeth.
Our instinct don't even guide us toward eating meat : we wouldn't go bite in the leg of a cow or a dead racoon on the side of a road. On the other hand, our hands are perfectly designed to pick fruits.
Contrary to belief, we have not always been carnivorous. Meat is a survival food, and men ate it during Ice Age, or you may need to eat meat if you live today in Alaska, Groenland, Yukon, et cetera. To survive, because meat is a survival food, a food of poor quality when it comes to thrive and achieve full human potential.

There's this idea of anorexic looking vegans in meateaters' minds. Truth is there's obese, normal and anorexics in all diets. I myself can lose 10 pounds in one week on a vegan diet, and gain those 10 pounds back in 2 weeks. I can gain bodyfat or only lean mass. It's all about calories and activity level.
A vegan diet is deficient ? Analyze what the content of a fruit or vegetable on and compare the amounts of vitamins and minerals with meat, you'll see. "Vegans short on 3 nutritents Meat eaters short on 7" Here's what Dr. Michael Greger say:

Vegan Diets Deficient in Three Nutrients? Well, Meateaters are Deficient in Seven!

The latest data on the dietary intakes of vegans was just published last month.[1] The diets of about 100 vegans were recorded for a week and were found deficient in calcium, iodine and vitamin B12. Using the same standards, though, the standard American diet are deficient in 7 nutrients! The diet of your average American is not only also deficient in calcium and iodine, it's deficient in vitamin C, vitamin E, fiber, folate, and magnesium as well.[2]

Not only does the American public have over twice as many nutritional deficiencies in their diets, vegans were shown to have higher intakes of 16 out of the 19 nutrients studied, includeing calcium. The vegans were getting more than enough protein on average and three times more vitamin C, three times more vitamin E, three times more fiber. Vegans got twice the folate, twice the magnesium, twice the copper, twice the manganese.

... So when a meateater asks you "Where you get your B12?" You can counter with "Where do you get your vitamin C, vitamin E, fiber, folate, and magnesium? And while you're at it, you can ask them how they keep their sodium, saturated fat, total fat and cholesterol intake under control (not to mention their weight).
... And their sexual impotence, and their agressivity. Their heart attacks and cancers...

In fruits and greens you can find all vitamins and minerals, fibres, healthy fats high in poly and mono unsaturated fatty acids. There's no cholesterol in the plant kingdom. On a vegan diet, you end up eating incredibly less chemicals and toxins than on a diet based on animal products, because you eat more foods at the bottom of the food chain, that grew on sunlight and water.The flesh of fish contains 10 million times more methyl mercury than in the water they live in.  You get from natural foods all the energy you need to thrive, with endurance and strenght. Meat is not food offered by nature, it's corpses, a waste of the nature. 
-Meat = constipation. There's no fibres at all. Animal products: low in most vitamins and minerals. High in fats, especially saturated fats, cholesterol is found only in the animal kingdom. Today, milk and all dairies as well as meat contains things nobody -- even people on an omnivore diet -- would want to put in their body :
-Meat: adrenalin and lactic acid injected in muscles during the ultimate last moments of stress before the animal is slaughtered, toxins, antibiotics, grownt hormones, all pesticides, insecticides and other chemicals accumulated by the animals through the food chain, blood, excrements and pus in milk -- this liquid meat is a poison that needs to be pasteurized in order to get rid of all it's bacterias and risks for health. At least 75% of ground beef contains shit and E. Coli bacteria. 98% of chicken sold in USA contains excrements. At least 50% of fish contains parasites. Fish are also very toxic; just one small portion of fish exceeds the tolerated amount of mercury and other heavy metals that are estimated as being harmful to human health.

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