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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.