The thinnest people on the planet are those who eat the most carbohydrates.

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.

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.

In China, because China is gaining wealth, rice consumption is way down. Rice is a poor person's food, and they're eating less of it. To wait in line at a fast food chain is cool. And they haven't historically had weight problems. So they don't have this culture of, "I need to lose weight."

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.

In my own life, I decided to leave meat off my plate in medical school, but was a bit slow to realise that dairy products and eggs are not health foods either.