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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Ever wonder what your French fries were fried in?

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Like bumbling burglars who leave fingerprints at a crime scene, cooking oils leave their own clues.

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And by measuring the carbon isotopes in French fries, University of Hawaii researchers found that one oil tops all others as the choice to fry fries in: corn oil.

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That's according to a report in the Proceedings of the National Academy of Sciences.

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National chain restaurants typically reveal only that fries may contain one or more of the following oils: corn, canola, soybean, cottonseed, sunflower and palm.

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But consumers might like a little more info: in a meal of burger, fries and soda,

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20 percent of the total calories come from the oil that fried the potatoes.

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Analyzing fries from nearly 200 Hawaiian restaurants, the scientists found that 69 percent of the national chain outlets used corn oil, compared with just 20 percent of independent eateries.

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Corn oil is probably the least healthy of the oils mentioned, with more harmful saturated fats than canola or sunflower and fewer heart-healthy compounds than soybean.

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Of course, regardless of what they're fried in, French fries probably aren't on your diet.

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Then again, you're probably not on your diet either.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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