How did that one guy who ate an airplane not have like really bad tummy problems?
He had a few conditions that made it easier. He had extremely thick stomach lining and stronger than average stomach acid. He also had “pica” which is a disorder that makes a person crave inedible objects. He lubricated everything with mineral oil to get it down his throat.
He had a lot of conditioning (he consumed many things before the plane) and he ate it very slowly.