What fast food restaurant attracts the most obese people?

I would say the multiplexes like one building serving as KFC / Taco Bell / Pizza Hut.

Also Dunkin Donuts / Baskin Robbins.

A veritable smorgasbord.

I'm not really sure, but this question does bring up a practice I have begun to use. Whenever I'm at a restaurant, either fast food or sit-down, I make a mental note of the "obesity factor" of everyone present, and rank the place as either a "skinny" restaurant or a "fat" restaurant. There are definitely patterns, and I've started eating more often at only the places I perceive to be "skinny". My observation is that the local Mexican restaurants are much fatter than the Japanese sushi bars, for example. As for chains, Pizza Hut seems to be on the heavy side.

McDonald's for sure.