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.

There are certain products that it's worth buying organic just because the alternatives have so much pesticide. There's a list of the dirty dozen that you can get off the Web. Strawberries, potatoes. A handful of crops that have very high pesticide residues if you don't buy organic. If you eat that a lot, that's a good place to invest.

Avoid food products with more than five ingredients; with ingredients you can't pronounce.

To put it bluntly, we now need to reverse course. We need more highly skilled small farmers in more places all across America - not as a matter of nostalgia for the agrarian past but as a matter of national security. For nations that lose the ability to substantially feed themselves will find themselves as gravely compromised in their international dealings as nations that depend on foreign sources of oil presently do. But while there are alternatives to oil, there are no alternatives to food.

People don't eat nutrients, they eat foods, and foods can behave very differently than the nutrients they contain.

Every major food company now has an organic division. There's more capital going into organic agriculture than ever before.

Avoid food products containing ingredients that a third-grader cannot pronounce.