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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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People about to have surgery must tell their health care providers about all supplements they take.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.