I've seen a few eating competition before. They don't chew but swallow more. Chewing kills time.
What is more amazing than storing all of that food inside your stomach is the ability to eat without getting that tired feeling of eating. You know what I'm talking about. For myself, 2 pieces of chicken are delicious but after the 3rd, my body can not eat no more cuz the hunger got satisfied and eating doesn't taste good no more and eating after that is like a chore, a forcing event.
Like eating fat pieces of meat. I can eat it if I am hungry but after a few first pieces, you can literally taste that unhealthy fat and your body tells you to stop eating. A false sense of fullness so of speak thus why mommy be telling us kids to stop eating snacks cuz it will ruin your appetite come dinner time.