Fast food often gets a bad wrap for contributing to America's obesity crisis,
but others say it can actually be a way to lose weight.
High school teacher John Cisna lost 37 pounds in just a few months eating nothing but McDonalds.
He did it as part of a science experiment in order to prove that you can lose weight eating fast food.
Cisna was in Rothschild today talking to local teachers about his amazing transformation.
While many say his experience is the opposite of that portrayed in the movie Supersize Me, he says that both outcomes are actually possible.
"You could take Morgan Spurlock to any other restaurant and he would still prove his hypothesis true, you could take me to any other restaurant and my hypothesis would be proven true, so I guess it comes down to what the people want to choose as their lifestyle. " Cisna says.
Cisna has been touring the country talking about his weight loss.
He says he especially loves talking to teachers about how to get students involved in experiments like this.
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