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.

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

If some people think, "Why am I eating a dead bird soaked in poop?" I think if some people get disgusted by that, it's all to the good. Their coronary arteries will be healthier.

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.

Overall, our population is in the worst shape it's ever been. Children are in terrible shape. We have absolutely unprecedented numbers of obese and overweight children - one in three now. A generation ago it was something like one in ten.

While it's certainly true that many people think that dairy doesn't have a cost to the animal, it's because they never went to a dairy farm.

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