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1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .Exercise is good for you.
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3 .Antioxidants are good for you.
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4 .But put them together and it's not as good as you'd think.
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5 .Because a recent study shows that some vitamins block the beneficial effects of exercise.
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6 .A good workout not only gets your heart pumping, it makes your body better able to process glucose and decreases your risk of diabetes.
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7 .And it does so, in part, by firing up your cells' mitochondria.
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8 .Stoking those mitochondrial flames boosts your metabolism.
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9 .But it also throws off so-called free radicals, which are usually considered harmful.
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10 .So adding antioxidants--which get rid of free radicals--should make your workout even healthier, right?
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11 .Well, no.
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12 .Forty men took part in a four-week training program.
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13 .Half the group also received daily doses of Vitamins C and E.
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14 .The researchers discovered that exercise on its own improves insulin sensitivity, which keeps diabetes at bay.
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15 .But taking the vitamins erased that gain--findings that appear in the May 12th issue of the Proceedings of the National Academy of Sciences.
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16 .So you actually need a burst of potentially damaging radicals to reap some of the important rewards of a good sweat.
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17 .Which means that even on a molecular level: no pain, no gain.
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18 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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