I happened to remember that I rented two food industry movies on iTunes, and which were expiring soon. These were King Corn and Food Inc.
Besides these two movies, I also recommend watching Fast Food Nation, but only if you have a very strong stomach. I'm not sure what they do to the people is much better than what they do to the animals. Another one is Super Size Me, which is rather humorous while taking on a very serious issue: a man's decline in diet and health.
Good info to have though, maybe the nausea makes us become smarter and more sustainable consumers. It sure makes me think twice.