Actually, Cuts Off Prius, ALL sugar is REALLY bad for one's health. When I finish off my expensive agave sweetener, I'm switching to Xylitol, which not only sweetens but some research suggests it may have positive health effects, too.
This will open your eyes about the health effects of sugar:
Subsidies and regulations for fuel ethanol are more focused on non-corn sources. Not saying corn isn't the major source, but it is no longer the dandy.