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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .Doctors routinely measure a patient's body mass index, or BMI.
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3 .And if that weight-to-height ratio points to obesity, the doc might prescribe exercise, to shed the extra pounds.
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4 .But when it comes to longevity, a focus on weight loss may be misplaced.
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5 .Because BMI isn't actually a very reliable indicator of life span.
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6 .A more useful measure, some physicians say, might be muscle mass.
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7 .Researchers analyzed BMI and muscle mass data from more than 3,600 seniors in a long-term study.
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8 .And they tracked which seniors had died, a decade later.
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9 .Turns out BMI wasn't much good at predicting chance of death.
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10 .But muscle mass was: more muscle meant better odds of survival.
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11 .The study appears in The American Journal of Medicine.
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12 .There's no cause-and-effect here, just correlation for now.
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13 .But study author Preethi Srikanthan, of U.C.L.A., has this recommendation:
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14 ."Get up and start moving.
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15 .Focus on trying to maintain the maximum amount of resistance training that you can,
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16 .and stop worrying so much about dropping calories."
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17 .Which could take a little weight off your mind, too.
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18 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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