You won't die from eating a cheeseburger or two.
I tend to visit McDonald or KFC about twice a month or so - more often when I'm too busy to go home to eat. I enjoy that but I don't like to eat there often yet some people who care about me think that it's too much. I also eat at other restaurants (normal restaurants, not fast food) often but I like variety.
The point is that whenever I eat at McDonalds I don't instantly order heaps of the biggest heart-stopper burgers. My casual McDonalds dinner doesn't contain that many more calories than any other meal would because I don't eat like an elephant. And a bigger amount of fat and salt from time to time won't harm me either.
The problem starts when you eat a lot of fat burgers and it's almost a habit for you. I would agree that 90% of these people probably don't look healthy at all.
The thing is that 95-97% of people who go there here look very healthy but then again we don't have any serious problems with overweight people. Fat people are pretty much a rare sight.
That's probably because our mentality is different and we don't have these guys who eat junk food everyday.
Most people wouldn't eat at fast food joints more often than once or twice a week and if they did they would eat a burger or two after which they would feel too guilty to eat more.
I don't know a single person that would base their diet on fast food restaurants. Most people I see at McDonalds are just normal, pretty random people who don't eat there very often.
Also there's a significant difference between the amount of food that people consume at McDonalds/KFC here and the amount of food that people tend to consume in these restaurants in the US.
Everyone is aware that food there is not healthy and thus here McDonalds/KFC seems to be the "last resort" for many people. Some people would rather struggle with their hunger than eat a hamburger if they already had one a day or two ago.
And other than fast foods our traditional dishes are pretty well balanced and healthy despite the fact that some of them contain relatively a lot of fat and most of them includes meat.
Also, our biggest fries/coke at McDonalds are of the size of the smallest in the US.
Even when I was in McDonalds in the UK people used to order much more than they do here. I believe that in America people order even more. People there don't keep that needed distance if it comes to fast foods. Some of them don't see anything wrong about eating at McDonalds way more often then they should.
Food at McDonalds is not THAT unhealthy if you eat it from time to time in fair amounts. It's HOW you eat it that is a problem. After eating 2000 calories or so in 1 meal, eating that way quite often there's no surprise that these people aren't fit.