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.

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.

Dogs have a sense of smell much greater than ours and they're much faster than we are. We have fairly dull senses, fairly slow locomotion. In our Olympic trials, we celebrate speeds that would be an embarrassment to a bird or a dog or another animal.

I was aware of what animals go through because I had driven animals to slaughter and I'd killed animals. And I was aware that there were certain ethical issues, but they weren't preying on my mind very heavily.

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.

Music is the exact opposite of anxiety. It's there to relieve anxiety, to calm you down. And to just get the noise out of your biological system. So that, it's not going to make your immune system stronger than normal. What it does, in my view, is allow your immune system to work with the full force of normality.

Chicken fat, beef fat, fish fat, fried foods - these are the foods that fuel our fat genes by giving them raw materials for building body fat.