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

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Winter is high time for heart attacks.

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And while snow shoveling can pose a danger to your heart, the winter heart attack trend holds true in places that never see snow.

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So researchers in sunny Brazil investigated another cardio culprit: cholesterol.

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They tracked cholesterol levels in a quarter million people living outside Sao Paulo--mostly middle-aged men and women.

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And they found that levels of LDL, or bad cholesterol, shot up during the South American winter.

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The change pushed 18,000 people with borderline cholesterol levels over the threshold.

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The finding was presented at a recent meeting of the American College of Cardiology.

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Why the wintertime spike?

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People tend to exercise less in winter, and to eat more fatty foods.

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We also get less vitamin D from sunlight, and studies suggest vitamin D may improve the ratio of good to bad cholesterol.

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The biggest concern, the researchers say, is that one annual cholesterol check could over or underestimate your actual levels,

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and have an outsized influence on whether or not your doctor prescribes meds.

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The study doctors offer their own wintertime prescription: exercise, eat healthy and get more sun.

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Might keep you young at heart.

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

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