Michael Pollan

If you've never read one of his books, I strongly suggest that you do! He's written In Defense of Food: an Eater's Manifesto, and The Omnivore's Dilemma. I'm sure you can find either one at your local library. He suggests that you should mostly eat things that have ingredients that you can pronounce (which virtually eliminates junk foods - check the label sometime).

Anyway, he's got a documentary out, "Food, Inc." I intend to track it down for my viewing pleasure sometime soon - if you live near me, let me know, we can have a viewing party! Anyway, here's an online review:

http://blog.newsweek.com/blogs/popvox/archive/2009/06/11/author-michael-pollan-on-food-inc-and-how-to-eat-well.aspx