If you haven't taken the time to watch this, you should.
This is a talk given a while back by Dr. Robert H. Lustig from the University of California, discussing how sugar and processed food have been promoted endlessly in our society, and the devastating effect those things have had on our bodies. It's fascinating stuff and is the scientific basis for a lot of what we are doing for ourselves here on MFP.
It also gets into something that we should all recognize - that so-called "diet" foods are NOT the panacea that they seem. He does a good job explaining the biochemestry of why.
This takes more than an hour to get through, but it really is worth every minute you'll spend with it. It will definitely change the way that you look at the politics of food and the health ramifications of food choices. I know that it's a whole lot easier for me to make healthy choices knowing now some of the things shared in this video.
Anyway - enjoy!
http://youtu.be/dBnniua6-oM