I have, a fair few times. When you are slogging home after an epic all day that’s taken hours longer than expected, you’re cold and wet and on the verge of collapse through extreme hunger, riding past any kind of food is not really happening.
Down here in the Valleys there are plenty of them around too.
I often stop at BK at service stations on the way back from races, but that’s through lack of choice. However after one 100km event I felt utterly terrible – really bad headache, nauseous, in a pretty poor state and we stopped at a BK and within seconds of eating my first french fry I felt absolutely fine again. And I had been (or thought I had been) nourishing myself well throughout the race.
I suspect some kind of salt deficiency or hydration problem, but I dunno. I’d had recovery drink and fluids and whatnot after the race of course.