The McDonald's Diet: Man Lost 56 Pounds Eating Only McDonald's Food

Image: John Cisna

Move over, Jared - there's a new fast food diet in town!

Meet John Cisna, a high school science teacher in Colo, Iowa, who lost weight and gained fame by eating only at McDonald's. In his new book My McDonald's Diet, Cisna explained that he lost 56 pounds, shaved a total of 21 inches off his chest, waist and hips, and lowered his cholesterol by eating only at the fast food chain.

Cisna's McDonald's diet will end on March 15, and he told TODAY, "It's kind of scary to realize that in nine days, I'll have spent half a year of my life eating nothing but McDonald's. I'm not bored of the food, but I am missing other foods. I am craving seafood. In fact, my first night when I am done with this, I'm going to have some shrimp and some scallops and some salmon. Maybe some asparagus on a bed of rice pilaf." [More McFacts About McDonald's]

What? Missing seafood? Didn't he know he could have the Filet-O-Fish?

Turns out, Cisna wasn't the first person who tried the McDonald's Diet. Back in 2008, we covered the story of Chris Coleson, who lost 86 pounds eating nothing but food at the Golden Arches. And if you thought that's impressive, check out the story of Kansas State University professor Mark Haub who lost 27 pounds eating only Twinkies.