A while back, I pondered the mystery of why mice won’t eat the outer shell of a peanut M&M. Perhaps mice know something we don’t? You may agree after reading about an elementary school experiment with mice and junk food.

Each year, Sister Luigi Frigo’s second grade class in Cudahy, Wisconsin feeds two sets of mice a different diet for four days. One set eats highly processed foods that are typical of school cafeterias, 80 percent of which still sell fast food or junk food items. The other mice where fed a diet based on whole foods.

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