Once you introduce the issue to young people and suggest to them that they have the ability to vote with their forks, either by positively going for certain kinds of foods or rejecting other kinds of foods, they realize that this is a responsibility and an opportunity to shape the world a little bit by their own choices.

Eat food. Not too much. Mostly plants. That, more or less, is the short answer to the supposedly incredibly complicated and confusing question of what we humans should eat in order to be maximally healthy.

You want to say the thing that will drive everybody in the direction you want to go. But as a writer you have a pact with your readers that you'll be really straight with them at all times.

Don't eat anything incapable of rotting.

If you're not hungry enough to eat an apple, you're not hungry.

I really try to write as an ordinary person would, not as someone who's too sophisticated about food, or too knowledgeable about things.

The interesting thing I learned was that if you're really concerned about your health, the best decisions for your health turn out to be the best decisions for the farmers and the best decisions for the environment-and that there is no contradiction there.