I have been following a vegan diet now since the 1980s, and find it not only healthier, but also much more attractive than the chunks of meat that were on my plate as a child.

A vegan diet takes care of most of what we need to do. But you'll also want to minimize the use of oils generally, because while olive oil and other vegetable oils are better for your heart than chicken fat, they are as fattening as animal fats.

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.

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.

The beef industry has contributed to more American deaths than all the wars of this century, all natural disasters, and all automobile accidents combined.