You know, the most ironic part of this attempt at social engineering, is that it will have the OPPOSITE effect of the supposed goal.
The Average Person on the street will see Fast Food as HEALTHIER, and will thus eat it more often.
BTW, I believe that is the goal of the legislators - they've been lobbied from the inside by the fast food corporations to pass this law - with the end result being a way to "Heathify" their image and increase consumption.