If you want to learn more about food, you can watch The Future of Food for free at hulu.com: http://www.hulu.com/watch/67878/the-future-of-food
Or Super-Size Me: http://www.hulu.com/watch/63283/super-size-me?c=News-and-Information/Documentary-and-Biography
Food Inc. is really good too, but it's not on Hulu. I think it might be on Google Video though, I can't remember.