Well, it depends what the content of your essay will consist of, but I would say that most people would expect you to argue that fast food should not be served at schools... So maybe if you could come up with a title that somehow catches the reader unexpected by offering a different view, then that could be a very powerful title.
For example, you could go with "5 unexpected reasons why fast food is actually the best thing kids should be served at school."
Of course, you'd then need to justify that title in the rest of your essay - so be careful to pick a title you can back up.
