I disagree. From my experience, Chick-fil-a is a lot healthier. The worst entree item on their menu doesn't even break the 500-calorie barrier. Subway has a few items (like the meatball marinara) that are not very good for you. As for the worst, Five Guys and Carls Jr do have worse items than Burger King.
Ok, it is true that Chick-Fil-A has some pretty healthy items. However, I've lived my whole life in the South (I currently live in Alabama, lived most of my life a state over in Mississippi), and while I realize that Chick-Fil-A is a Southern joint (it's based in Atlanta, after all), states like Mississippi and Alabama are known to be some of the most obese in the United States. I know that a report released back in 2009 stated that MS had become the fattest state in the US, and while I believe Arkansas and West Virginia have surpassed it now, it's still staggeringly close. I will say that ever since I moved to the Huntsville area that there seems to be more focus on heath and fitness here than there was when I lived in central MS (around Jackson, the capital of and the largest city in the state), but it's still common to find people order large portions of unhealthy food. But, it is true that Chick-Fil-A is probably one of the healthiest fast food restaurant chains out there.
The thing about Subway is that I usually just order things like chicken teriyaki on my sandwiches there. Obviously the meatball marinara isn't going to be that healthy (why Americans have to turn Italian food unhealthy I'll never understand), but you are given the chances to keep the calories down, basically. It's still healthier than McDonald's, Wendy's, or Burger King.
We don't have Carl's Jr. in the South (there is Hardee's though, and I live close to one here in the Huntsville area, but the one that close to us around Jackson closed around 2005 I think, and yes, they have some pretty unhealthy options), and I've never been to a Five Guys before in my life (there was one close to us in a shopping center near Jackson though), but I'm not surprised that they don't have the healthiest options either. I don't know, I think fast food is kind of on its way out... There's definitely been a larger focus on health both in the US and worldwide, and people have gradually been cooking at home anymore-these are trends that I'm willing to bet haven't been seen since the '60s.