The documentary was released yesterday, two days before the annual Nathan's Famous International Hot Dog Eating Contest that brought Kobayashi to prominence in the competitive eating arena.
The documentary shows the rivalry between the six-time champion and the current 11-time champion Joey Chestnut, who dethroned Kobayashi in 2007.
Holding 15 world records, the 58kg Kobayashi explains his preparation for eating.
"I have to put something inside the stomach to make it expand, but it doesn't necessarily have to be food. I train with water. So, I'm not training for long periods of time by hauling food. I'm training with water expanding my stomach," Kobayashi said.
After a competition, it takes him about three days to recover.
"I feel so exhausted and so out of breath," Kobayashi said, referring to his stomach being over-extended and the toll it takes on him. "When my stomach becomes very full with that amount of food inside, the organs in my body begin to shift places.
"So, for example, my lungs get shifted up, and they can't expand. They have no room to expand. So, when I breathe, I become very short of breath. That's one of the main things that happens right after eating," he said.
Another thing is getting sick. But he says it's not something that happens as much as people think.
"If I'm going to be sick, it happens right after."
While he's eaten almost everything in competition from bunless hotdogs and rice balls to lobster rolls, one of the oddest is cow brains. He ate 57 of them, a total of 8kg. And did it in 15 minutes.
But there's one he loves to eat above all.
"I savour hot dogs," he said.
- AP
