Teacher Loses Nearly 60 Pounds on McDonald's-Only Diet

John Cisna, a biology teacher from Iowa, is now a brand ambassador for the fast food chain after conducting an experiment to see how he could improve his health by eating a 2,000-calorie diet of only McDonald's meals.
1:32 | 05/08/15

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Transcript for Teacher Loses Nearly 60 Pounds on McDonald's-Only Diet
I need an eight like a like. A bowl of oatmeal. And a 1% milk Jon says snapped a biology teacher from Iowa and the subject of this science experiment is it possible for person to become better off. Eating nothing but McDonald's for breakfast lunch and dinner for ninety days is now and three of his students sat have to find any answer. For three months says no walked 45 minutes today. Stuck to a 2000 calorie diet and follow the recommended nutrition guidelines set by the FDA. In the result. It was absolutely is down astounding after ninety days I lost 37 pounds. My cholesterol went from 249. To 170. On a typical day's business started with TU and white delights a bowl of oatmeal and 1% milk. For lunch the choice between S southwest herb bacon ranch salad. With fruit parfait and apple slices to finish the day and aluminium hard is it isn't believe I have French Fries almost every day of this room. While experts say they aren't surprised by his results after sticking to this type of many and they don't recommend making eating out a habit today. After day you can get the healthiest option unity to get salad you can get a quite that's where thing. But the chick in that they put on the salads it'll have a lot of sodium in there and that can definitely make your blood pressure go up. As first is now and his class he says the results are lesson it's not now where you eat but watch UB.

This transcript has been automatically generated and may not be 100% accurate.

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