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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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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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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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