It's pretty easy to eat healthy at McDonalds, get a grilled chicken sandwhich with no mayo, skip the fries and soda and get a bottle of water for dinner or lunch.

For breakfast get an egg mcmuffin, no hashbrown and grab a coffee or orange juice.

If you just stick to those two meals when you have to have fast food it does basically no harm.

Fast food gives you the rope to hang yourself with, you don't have to do use it.