I got sick a few years ago eating McDonalds, sicker than I've ever been eating fast food. Since then I can barely look at it without feeling queasy. I will get a burger from Wendys or Burger King on occasion if I am traveling or something but I only get fries from McD's.
Like others have said, I'd rather pay a few extra bucks at 5 guys or Chipotle or something like that than eat McD's/ BK/ Wendys. Also Chain restaurants like applebees, olive garden ext are awful. Rather spend the extra money/ time if I'm gonna go out