Trust me dude, there are so many people out their with unbelievable powers, some people are just too powerful, it is almost as if they are not human and this man right here is an example of humans like that. The man can eat and digest metallic objects.
Scary but true.
This basically means the guy can eat and even digest metal, glass and even toxic, poisonous material without going "Oh, s***! What was I thinking!" before puking blood and dying, which is what normally happens when other people try.