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Low vitamin D levels are a problem these days. It can mean that you are just not getting the required 20 minutes per day of sun exposure. Vitamin D is important to calcium absorption
http://answers.ask.com/Health/Diseases/what_causes...
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Once of the greatest sources for vitamin D is to be out in the sun. If you are more of a home body, or it's winter time, you may not be getting enough vitamin D if you are not eating
http://answers.ask.com/Health/Diseases/what_causes...
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If you are not taking at least 1,000 IU of D3 daily, then you are probably dangerously low.
http://wiki.answers.com/Q/How_low_is_dangerously_l...
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If you have inadequate sun exposure, your body cannot synthesise Vitamin D.
http://wiki.answers.com/Q/Why_would_your_level_of_...
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