Michele requested that I post the link to this fascinating lecture. It's long and in nine 10-minute parts. There's also a bit of BioChemistry in there, but you can glaze over that part. Don't recommend skipping that part altogether, though, as he makes some poignant conclusions.
I knew I gave up refined sugar for a reason...
http://www.youtube.com/watch?v=WjxyjcvW7RE
-Caroline