I lived on McDonald's for a year, was healthy. I still eat it but limit myself to $5 or less, ice tea or no drink and usually no fries. Of course they are cleaner than real restaurants. Minimal raw prep, very standardized storage and holding systems and a company wide training program. Just stay away from the dairy machines. At any restaurant. I have sanitized many a soda, juice, and powdered coffee machine and I can assure you that the average employee has no clue. Back on clean, at real restaurants you eat off their plates. I have also fixed more than a few commercial dishwashers, sanitary there takes committed and smart people.