Yeah, I'm not doubting Phelps' claim--I'm merely stating someone else's opinion on the matter. I agree that 6000 cals per day is pretty insane. In my own daily life I tend to somewhat count calories (as well as count the calories I'm burning while working out), so just eating at a place like Burger King can equal a shitload of calories. But to eat 10,000 calories a day?
Dayyyyyyum!