Found an interesting documentary the challenges many underlying concepts in Supersize Me. It's a little long, I watched it all and found it very interesting. If you're short on time, watch from minute 53 to 1 hour and 13 minutes.
I'm no diet expert, so I take neither side. I just enjoy hearing two vastly different viewpoints. So, I encourage you to watch at least some of it and have an open debate. BTW, it in no way gets bad after the 1 hour and 13 minute mark, so if you like it, keep watching.
I thought I'd bring this here b/c you all seem to know a hell of a lot more about dieting than many 'professionals' and also b/c some of the concepts brought up by the documentary are ones I've only read on this forum, such as lowering carbs and raising fats.
http://www.hulu.com/watch/196879/fat-head