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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Everyone has one nostril that is larger than the other.