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FAST FOOD: Iowa Teacher’s Diet Featured On Today

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A Colo-Nesco High School science teacher is in the midst of a project with his students. And he is the subject being studied.

John Cisna ate only at McDonald’s for three months. His students helped him plan his meals sticking to a 2,000 calorie-a-day diet. He also used the daily recommended allowances for carbs, proteins, sugars and fats.

Cisna also started walking 45 minutes each day. The 54-year-old lost 37 pounds and saw his cholesterol levels drop.

He was on The Today Show Monday morning and says the project isn't over yet.

"The first part of the experiment is done, but it's going so well,” Cisna told hosts Matt Lauer and Savannah Guthrie.

“One of the things that I want to try differently is continue with the diet through March 15, but now do exercise of what I’m capable of doing. One of the neat things about the first 90 days is the fact that we have made this simple. Not everybody can jog, not everybody can lift weights. But everybody can walk."

NBC’s registered dietitian said there was one red flag in Cisna's meals. Joy Bauer says his salt intake was too high at more than double what is recommended.