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This is Scientific American's 60-Second Mind, I'm Erika Beras. Got a minute?

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We know junk food can change the way bodies are shaped.

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Now, a study finds that those irresistible sweet and salty concoctions may also change the way brains are wired, at least in rats.

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Researchers divided rats into two groups,one labeled Cafeteria, the other called Chow.

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Both groups got a typical rat food diet, but the Cafeteria rats also got a bonus: meat pies, cakes and cookies.

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Both rat groups gained weight.

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But the Cafeteria rats gained significantly more than the Chows did, nearly half a pound more, which is a big body burden for a rat.

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But more important, over two weeks time the Cafeteria rats seemed to care less and less about even seeking out a balanced diet.

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This new behavior endured even after the rats were returned to their more healthy fare.

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The study is in the journal Frontiers in Psychology.

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The researchers think junk-food diets cause lasting changes in the rewards circuits part of the brain, which plays a big role in decision-making.

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So if you're a regular cookie eater and the next time you mindlessly reach for a cookie you wonder why you can't help yourself,

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well, it could be because you're not in charge, your rewired brain is.

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Thanks for the minute, for Scientific American's 60-Second Mind. I'm Erika Beras.

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