Back in 2009, a doctor named Robert Lustig was the first to put himself out on a professional limb and say we have problems with sugar in a Youtube video called Sugar: The Bitter Truth. It was a very long lecture using a lot of science terms that probably scared away half the audience out of fear of learning something hard and scared the other half numb with incredulity. In the original video he says that sugar (fructose especially) is the toxin that is causing our obesity epidemic.