American farmers produced 600 more calories per person per day in 2000 than they did in 1980. But some calories got cheaper than others: Since 1980, the price of sweeteners and added fats (most of them derived, respectively, from subsidized corn and subsidized soybeans), dropped 20 percent, while the price of fresh fruits and vegetables increased by 40 percent.

The longer I've looked at these questions, of the American diet and the public health crisis that we face because of that diet, the more I've come to the conclusion that the collapse of cooking is a big part of the problem.

We're spending, on average, 27 minutes a day cooking and about four minutes cleaning up, so basically about a half hour. Any one of TV shows takes twice as long to watch as that, which I think is very interesting because the main excuse people give for not cooking is they don't have time to cook, but somehow they're finding time to watch other people cook or eat on TV.

...think of agriculture as something the grasses did to people to conquer the trees.

We have food deserts in our cities. We know that the distance you live from a supplier of fresh produce is one of the best predictors of your health. And in the inner city, people don't have grocery stores. They have to get on a bus and take a long ride to get to a source of fresh produce.

I agree insofar as we eat too much meat. We're eating about 200 pounds per person per year. That's about 9 ounces a day. That's probably more than is good for us and it's certainly more than is good for the environment.

Eat mostly plants, especially leaves.