Why is it a myth that muscle turns into fat when someone stops working out?

Muscle and fat are different kinds of tissue, so one cannot directly turn into the other. When someone stops working out, muscle may shrink from lack of use, while fat may increase if they take in more energy than they use. Those changes can happen at the same time, but that does not mean muscle became fat. The correct choice is “Muscle and fat are two different kinds of tissue.”

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