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Things You Should Know

Where Does the Fat Go When You Lose Weight?

The Know-It-All author A.J. Jacobs weighs in with the answer. "It breaks down into carbon dioxide and water," A.J. says. "The carbon dioxide you breathe out and the water you either sweat out or you pee out."

The fat cells stay in your body, he says. "They just get thinner. They're just waiting for more fat to come in. They're very sneaky."