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This is Scientific American 60-Second Science. I'm Katherine Harmon.Got a minute?

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Our bodies are home to trillions of other organisms that influence our health, and probably our weight.

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Researchers found that mice given gut microbes from obese humans became fatter than those that got microbes carried by slim folks.

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When the husky and lean mice shared microbes with each other, the bigger ones picked up some of the beneficial gut flora and had improved metabolisms.

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But this shift only occurred if the mice were on a high-fiber, low-saturated fat diet.

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If they were on a junk food diet, no improvement.

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The findings are in the journal Science.

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It's not clear how humans might remodel our microbial communities to change health or weight class.

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The mice in the study were raised in germ-free environments and had no native microbiomes of their own.

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In people, so-called fecal transplants have been reserved for more severe conditions than a bulging belly.

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And probiotic products, such as yogurt, are minimally effective.

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But flat or fat, what your belly looks like on the outside might have a lot to do with what's on the inside.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Katherine Harmon.

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