7/18/2013 7:35:14 AM
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Older people with vitamin D deficiency may struggle with daily physical activities such as dressing or climbing stairs, a new study shows. It's estimated that as many as 90 percent of older people are vitamin D-deficient. The vitamin, usually absorbed through sunlight or diet, plays a key role in bone and muscle health, and a deficiency can lead to reduced bone density, muscle weakness, osteoporosis and broken bones.
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