My wife's cousin is has a PhD in health science, is in great shape, eats healthily, and is a middle school PE teacher. She won't touch what her students have to eat. It is not that the food is not healthy. It is that the combination of available ingredients, the time to prepare, and the skill level of those preparing don't often end up with things that taste on the majority good. It isn't any better to teach the "lard butts" that you've got to hate eating because you teach them that healthy food tastes like garbage.