Metabolism. Those of us burly types would give an internal organ to be able to eat like that. My weight hhovers in the 230-240 pound range, and a taco makes me full for an hour. Of course, if I gave up beer, I’d drop a stone in a week. But that’s asking a lot of me.
Actually, guzzling a warm (110 °F) stout beer and then jumping down the stairs with your feet together is a tried-and-true frathouse remedy for stones.
Subsequently passing the stones is still quite painful, though.
Regards,