When a 38-year-old Maryland man gave up eating meat for ethical reasons 25 years ago, he faced the question that many new vegetarians encounter: what to eat. But for Dan Janssen the challenge was even more confounding given that he couldn’t stand vegetables. So he did what any teen boy would dream of; he began eating nothing but pizza.

And for the last quarter of a century he has eaten little else.

“I've been eating pizza exclusively every day of my life for the past 25 years, and I'm not just talking about a slice of pizza every day,” he told Vice.com. “I usually eat an entire 14-inch pizza, and I only eat cheese pizza. I never get sick of it. If I go to one pizza shop or another brand, it's like eating a completely different meal.”

The first thing that comes to mind – perhaps after a brief moment of envy – is how in the world can one survive on dough, sauce and cheese alone? Somehow, Janssen manages. Aside from diabetes … and needing therapy for food aversion … he is healthy, notes he. "Your cholesterol is fine. You seem healthy. Keep doing what you're doing," Janssen reports his doctors as saying.

Yet while Janssen seriously loves his pizza and never wants to give up his love for the pie, the pizzatarian says he hopes someday to broaden his horizons.

“I would like to be able to go to a restaurant where they didn't serve pizza and order off the menu, which I can't really do right now,” he says.

In the meantime, it’s pizza for breakfast, lunch and dinner; which means ordering a lot of pizza. Since Janssen may be the world’s leading authority on the topic, you may be interested in what he thinks of the major pizza chains?

“Well, I'd say they're all pretty bad, but I do frequent them,” he says. “Pizza is like sex – even when it's bad, it's good.”

Related stories on MNN:

This svelte man has eaten nothing but pizza for 25 years
“I'm thin. I have tons of energy, and I feel great every day,” says pizza devotee, Dan Janssen.