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Potato chips. Cookies. Candy. A burger, fries, and soda from your favorite fast-food restaurant. Most people know these are processed foods. But even apples, the classic healthy snack that keeps doctors away, are processed.

“‘Fresh’ apples are actually picked several months to a year before they show up in the supermarket,” says Soo-Yeun Lee, director of the School of Food Science at Washington State University. “They’re washed, coated with an edible wax, and stored in a very specific condition before they’re distributed. That’s all processing. Without it, apples would shrivel up or rot within a few weeks.”

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