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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.