There's a tribe in Africa that has this..."contest", if you will, where men compete to see who can get the fattest in a certain amount of time. I think it had to do with courtship rituals, or something.
The show I was watching showcased one young tribesman going through this ritual.
He would drink gallons of milk from the tribes' cow herd all day, for weeks, and not do anything else.
He was skinny and in great shape (as you would imagine an African tribesmen would be) at the beginning, but when it was all over, he looked like he just got through swallowing two old villagers that got in his way.
If I were you, I'd be prepared to change pants size.