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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.