I saw Fork Over Knives also but the science is a bit shaky. Take a look at rawfoodsos.com/2011/09/22/forks-over-knive
, it does a good job at talking to that movie. Not that there isn't some good info there but their assertions aren't strongly founded in good science. The real take away from it is that a diet based on junk food is bad and that one based whole foods including fruits, vegetables and, even though the movie says otherwise, wholesome sources of protein is good.
Lately, I've become interested in the Paleo Diet as described by Dr. Loren Cordain in his book. I've tried it for several weeks now and I've felt better than I have in quite a while. Energy is up, sleep is better and several pounds lost.