I've written about illegal immigrants in the United States; I spent a year following migrant farm workers as they were harvesting. I've written about our criminal justice system, and how it treats the victims of crime. I've been working for years now on a book about prisons in America, and I've been going into prisons and traveling around the country and seeing what's going on.

There's been a growing effort to kick soda out of the schools. And governors as different as Arnold Schwarzenegger in California and Mike Huckabee in Arkansas have worked hard to get soda and junk food out of their state schools, which is good.

What we eat has changed more in the last 40 years than in the previous 40,000. The survival of the current food system depends upon widespread ignorance of how it really operates.

I hate the word "inevitable" because I feel like things don't have to be the way they are.

Yes, a cheeseburger and fries is probably my favourite meal. But I don't eat ground beef anymore.

So for everything I do, I'm very clear about what I'm doing, and I tell people what it's about. They get a sense of what I'm thinking. I don't let people think I'm going to write something in praise in the meatpacking industry, and then they read it and it's actually attacking the meatpacking industry.

The current fast food that we have is inexpensive when you buy it, but the long-term costs of eating it and the long-term costs to society, are much too high. This cheap food, when you add up all the total costs, is much too expensive.