Yes, I agree that doing it at school doesn't really do much of anything. Speaking as a fat *** (Most wouldn't consider me "obese", just fat, but by scientific "official" standards I cross the line), most of my fat comes from when I randomly go on raids for snacks. It's not even really the meals that harm me that much. There's not much you can do to enforce that, unless you want to just start banning the sales of the vast majority of foods and put a bunch of people out of jobs who make it.
I pay no attention to my weight when I'm not on a diet, as I have a very specific one I use. It's called Isagenix and it's quite exspensive, which is why I quit it and ended up gaining back the weight eventually. All so typical. . .