This is crazy!
We all love pizza but this guy really LOVES pizza!
Dan Janssen has been surviving on pizza alone for 25 years. Yes, 25 YEARS!
However, there is method to his madness. Ever since he was a little boy, he has not been able to tolerate a whole lot of food, with pizza obviously being the kind of food he can.
While it is pretty surprising that Dan is not the size of a whale, we do not recommend you start a diet quite like this.