I've referred to Dr. Robert Lustig before a couple of times courtesy of Gary Taubes. Put simply, sugar is as addictive as cocaine & as evil (in more than minimal quantities) as tobacco & alcohol. Wow. Nasty. It's enough to ruin my cup of ice cream! This 60 Minutes segment really brings the point home!
BTW, I learned of this via the site War on Insulin. Good stuff there.