One surprise is how deeply the food system is implicated in climate change. I don't think that has really been on people's radar until very recently. 25 to 33 percent of climate change gases can be traced to the food system. I was also surprised that those diseases that we take for granted as what will kill us - heart disease, cancer, diabetes - were virtually unknown 150 years ago, before we began eating this way.

A natural historian is somebody who looks at something in terms of its relationship to the rest of the natural world. You look at things ecologically. When you see a cow on a feedlot, you don't just see a cow; you see a cow that is eating certain food. You follow that food and that food takes you back to a corn field.

I'm very hopeful that we'll see some change in our food system. I don't know how far we'll go, or how quickly we'll get there, but there is no question that a significant percentage of the American public is dissatisfied with the food system.

In the end I'm still a writer. I'm still a journalist, and my first responsibility is to my readers. That's where I have to draw the line.

We are what we eat, it is often said, but of course that's only part of the story. We are what what we eat eats too.

Without such a thing as fast food, there would be no need for slow food.

Now that I know how supermarket meat is made, I regard eating it as a somewhat risky proposition. I know how those animals live and what's on their hides when they go to slaughter, so I don't buy industrial meat.