hunter gatherers got 25% of their calories from meat. This doesn't humans to eat meat.

But there wasn't any evidence in your article showing that we have the anatomy of a omnivore.

"They classified humans as carnivores based on the percentage of meat in the typical human diet."

hunter gatherers got about 25% of their calories from meat: http://www.youtube.com/watch?v=h0PF5R0ywp4

Anyways. So what?
Just because that our ancestors ate meat, doesn't mean that this is what was best suited for their bodies.

When I speak about 'omnivore', 'herbivore', etc., I am referring to the anatomy of a species.

And to go back to the core argument,
And even if we could consume animal foods without getting health problems, so what???

We can live and thrive on a vegan diet, so killing and harming animals for food in our society is completely unnecessary. The only "justification" is that it tastes good/convenience -- and pleasure is no moral justification for hurting and killing an animal.

Vegan answer to ' There is nothing healthy long term about a vegan diet'

There are many people out there that write sensationalist articles to discredit veganism, see e.g. this article commenting on this phenomenon: http://www.nealhendrickson.com/mcdougall/030200puVeganDietDamages.htm
No knowledgeable vegan who eats properly would get any deficiencies. There are lots of people getting deficiencies on a diet of animal products, but no one writes sensationalist articles about them.

B12 is produced by bacteria and we don't need to consume animal products in order to get B12: http://www.drmcdougall.com/med_hot_supplements.html

The gladiators ate a vegan diet: http://www.drmcdougall.com/misc/2010nl/sep/powerful.htm

Our ancestors ate a primarily plant based diet:

When asked about the commonly held idea that ancient people were primarily meat-eaters, the highly respected anthropologist, Nathanial Dominy, PhD, from Dartmouth College responded, “That’s a myth. Hunter-gathers, the majority of their calories come from plant foods…meat is just too unpredictable.” After studying the bones, teeth, and genetics of primates for his entire career as a biological anthropologist, Dr. Dominy, states, “Humans might be more appropriately described as ‘starchivores.’”

http://www.drmcdougall.com/misc/2012nl/jun/paleo2.htm

Vitamin D we can get from sunlight: http://www.drmcdougall.com/misc/2011nl/mar/vitd.htm

Potatoes are a complete food: People can and have lived for extended periods on potatoes as their sole source of nourishment: http://www.drmcdougall.com/misc/2008nl/may/potato.htm
Only vitamin you can’t get from most potatoes today is vitamin B12 (find out why here): http://www.drmcdougall.com/misc/2007nl/nov/b12.htm
----
Finally. As can be seen when one is studying, there is no nutritional need to consume animal products. Choicing to do so, is to inflict unnecessary suffering and death upon other sentient beings, which as I pointed out isn't ethical.

This was my reply to Alan Low  who wrote:
Very nicely put and all well and good except for the fact that "vegan health" is an oxymoron. There is nothing healthy long term about a vegan diet. Vegetarian only just squeaks by but certainly not vegan. Major health problems lie that way. There is not and never in the whole existence of man has there ever been a vegan society. I wish you good luck but you are in for a world of problems down the road.