I finally sat down with Michael Pollan's excellent "Unhappy Meals" essay for the NYT Magazine. Probably the best food-related journalism I've read. Enjoyed his five rules of thumb:

1. Don’t eat anything your great-great-grandmother wouldn’t recognize as food. 2. Avoid even those food products that come bearing health claims... Don’t take the silence of the yams as a sign that they have nothing valuable to say about health. 3. Especially avoid food products containing ingredients that are a) unfamiliar, b) unpronounceable c) more than five in number — or that contain high-fructose corn syrup. 4. Get out of the supermarket whenever possible. 5. Pay more, eat less.