The McRib is 550 cals. I'm now wondering if one could do a weight maintenance program by simply eating 3 McRib's a day whenever they come back on the menu.
Eating sometimes is okay, I guess. Don't forget to take supplements for the micros you're missing. Eating the same thing every day though, requires discipline. I'd get fed up eating the same thing again and again even if it's some kind of a gorgeous meal.