Back when I was in college, I used to eat a lot of fast food - of course, I was schlepping to/from classes all day and walked everywhere, so I burned off those calories pretty quickly no matter what I ate. Also, I think there's some previously unknown glad in the human body that allows one to digest fast food well when we're in our 20's and beyond. However, overuse of the glad caused it to dry up by the time I was 30, and now I and most everyone I know can't stomach that stuff at all.
Some people have said the ingredients changed, but I'm gonna stick with the digestive gland theory :-)
Typicial Mickey D food, with people with attitudes employed. But that might be just due to the area the place is in. The next time the McRib returns, ask to have it served with the sauce on the side...doubt if you ever will eat it again.