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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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The familiar sounds of your heart are made by the heart's valves as they open and close.