I vote no, where will this babysitting end? Everyone knows if you eat fast food and sit on your butt all day your gonna get fat. Its as simple as that. We learn this in science, our doctors tell us. I cant believe that obese people go into the drs and they dont talk to them about the weight just like they lecture smokers they tend to lecture obese people too.
As far as people not knowing that fast food is bad for you I call hogwash this is common knowledge, you can see the calories right by what you are ordering if it has that much calories in it then you know it has other bad stuff.
Should we label cars to state that driving too fast can cause death? How about heavy appliances that if you lift them they can crush you? Labeling things doesn't deter as much as people would think.
One way to deter obese kids is punish the parents of obese kids, they are responsible for the children and their weight not these food companies.