For the past 25 years, Janssen, 38, a woodworker in Ellicott, Md., has lived on a diet that is almost entirely made up of cheese pizza.
The only exceptions: A weekly bowl of Raisin Bran, that peach he ate four years ago and the time he went to Germany and gobbled pretzels for two weeks because the pizza was not good.
Around the time that Janssen went all pizza, all the time, he was diagnosed with diabetes, which runs in his family.
Despite the occasional diabetic blood sugar blackout, Janssen said he's very healthy.
"Whenever I go to a new doctor.... my bloodwork comes back great and they say, 'You're doing great,'" he told the Baltimore Sun. "I'm active. I ride my bike 30, 40 miles at a time. I feel great.
"If I could say anything to the men of the world, it's you can do it. You can eat two 14-inch pizzas a day and be fine."