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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.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.