We seemed to eat a lot of McD's food too, but never paid for by the eater.
The group would "dare" that you wouldn't be able eat "whatever" quantity of food and if you accepted the challenge and failed, you would have to pay them back.
I ate 5 big Macs, 5 large fries, 20 nuggets, 5 milkshakes and 5 apple pies (quantities chosen as there were 5 of us present) in just under 30 minutes.... Never looked at McD's food in the same light again.
And I could have sworn you have previously cited medical issues as a cause for your heft!