Do most fast food restaurant primarily serve hanburger?

yes...most fast food resturants do serve hamburger...it depends what type you are looking for though...if you are looking for a healthy hamburger i would sugest that you go to like a restaurant like Apple bees or something like that because i dought that a Mcdonalds Hamburger is healthy! Even though Apple Bees isn't TOO healthy it is still better than Mcdonalds or Wendy's...for all you health consiouse people like i am :)