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段落1

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

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Doctors routinely measure a patient's body mass index, or BMI.

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And if that weight-to-height ratio points to obesity, the doc might prescribe exercise, to shed the extra pounds.

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But when it comes to longevity, a focus on weight loss may be misplaced.

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Because BMI isn't actually a very reliable indicator of life span.

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A more useful measure, some physicians say, might be muscle mass.

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Researchers analyzed BMI and muscle mass data from more than 3,600 seniors in a long-term study.

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And they tracked which seniors had died, a decade later.

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Turns out BMI wasn't much good at predicting chance of death.

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But muscle mass was: more muscle meant better odds of survival.

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The study appears in The American Journal of Medicine.

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There's no cause-and-effect here, just correlation for now.

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But study author Preethi Srikanthan, of U.C.L.A., has this recommendation:

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"Get up and start moving.

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Focus on trying to maintain the maximum amount of resistance training that you can,

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and stop worrying so much about dropping calories."

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Which could take a little weight off your mind, too.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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