(KFOR-TV) — COLO, Iowa – A teacher in Colo, Iowa, decided to eat only at McDonald’s for 90 days to see what it would do to his health.

The result turned out to be a good lesson for him and his students.

Which picture of this man was taken after he had eaten nothing but McDonald’s for 90 days?

“The average Joe would say the guy on the right,” science teacher John Cisna said. “I can eat any food at McDonald’s I want as long as I’m smart for the rest of the day with what I balance it out with.”

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