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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.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
The average adult has about 21 square feet of skin.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.