The Stone Age gave us arrow heads and eventually knives, and that allowed us to kill animals in ways you couldn't before, and once you had them you were able to remove the skin and bones.

I am always struck by how difficult it is for people to see how much cruelty they are bringing not only upon animals but upon themselves and their loved ones and other people, how much we are screwing up the planet, how much we are hurting our own health, how hard it is to change all that, how eager people are to make a buck at everybody else's expense - all those things are discouraging.

Not only are the studies themselves often lacking even face value, but they also drain badly needed funds away from patient care needs.

If a dog happens to catch a rabbit or another animal, it can very easily remove the hide. If a cat catches a squirrel, they have no trouble with that. But if a person does that, they will work all day and all night to get the skin off of an animal, because they don't have long canine teeth anymore.

Chimpanzees will eat a little bit of meat. But, they never eat dairy products, and no other animal would do that.

The dangers of eating animal products occur after the age of reproduction. If people developed cardiovascular disease that was fatal by the age of twelve or thirteen, eating animals would have died out long ago. You get it after you've already reproduced.

It's much better to say, "If the herd is running, I'm running with those guys." And humans have herd mentality.