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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.