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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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.

