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On average, the stomach produces 2 L of hydrochloric acid per day.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Vaccines prevent between 2.5 and 4 million deaths every year.
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