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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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There are 60,000 miles of blood vessels in every adult human.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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There are 20 feet of blood vessels in each square inch of human skin.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.