Well, if they're idiots about their eating habits, sure. But is
  it possible to eat healthy-enough with fast food? Of course it
  is. Is it possible to get fat and sickly and die from a health
  food sure? Sure it is. It's about not being stupid about eating.
  Basic education takes care of that whether one does fast food or
  decides to follow the cooks on TV with all the butter and salt
  and are very very round.