I thought that was my point. There isn't much in a Fast Food place I'd want to eat, so I rarely go in them.

You still haven't said if you are only interested in US restaurants.

For instance, in the UK (if I had to) I could go into a MacDonalds restaurant, get a salad and put as little dressing on it as I wanted to. (So I'm afraid I haven't seen the fat and calories in those so called healthy salads from the fast food places - the fat and calories come in sealed packets which I can choose not to douse the food with.)

Or I could go anywhere that sells Kebabs and ask for salad in pitta with, perhaps, just a touch of Hummus and a couple of dolmades.

Perhaps it's different in the US, but in the UK and Japan finding non-fattening food isn't really a problem, you just need to want to eat it.
In Spain you have these two options
Burger King: grilled chicken salad. Calorías: 210
McDonald’s: Grilled Chicken Caeser Salad : Calorías; 200
You can even get Gazpacho in McDonalds in Spain (it's made by Alvalle and comes up as 30/35kcal per 100mls http://www.alvalle.es/ing/index.html - it's actually delicious!)

Perhaps there are places that don't offer healthy alternatives to whatever it is their customers eat there - but I don't know what those places are because they really do slip beneath my radar.

Are things really that bad in the US? I've only been to New York, Las Vegas and San Francisco and found no shortage of healthy food there.

A British airport will have a seafood bar and a Pret-A-Manger almost as standard.

But it definitely is a question of awareness and 'education'. Even people who are aiming to lose weight won't necesasrily adapt their eating habits despite having alternatives right in front of them. So they continue to buy a lamb doner kebab slathered in sauce and it doesn't occur to them to ask for grilled chicken pieces instead, never mind the pita salad and dolmades option.