Have you seen the world champion, he doesnt look like an eater at all but he can shovel food down like his mouth is a bottomless pit.
Although, I have seen him meet his match once, he took on a bear in a challenge to eat 50 hot dogs. I will hunt the video down to post it, it is quite an impressive performance he puts up even when faced with such stern competition.
Edit:Found info on Kobayashi
http://en.wikipedia.org/wiki/Takeru_Kobayashi