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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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