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Your exposure to sunlight is limited. Because the body makes vitamin D when your skin is exposed to sunlight, you may be at risk of deficiency if you are homebound, live in northern latitudes, wear long robes or head coverings for religious reasons, or have an occupation that prevents sun exposure. You have dark skin.
The most common cause of low vitamin D is lack of sun exposure. Low levels of vitamin D are a definite red flag that your good bill of health is being threatened. Vitamin D deficiency is an underlying cause of many poor health conditions, as well as a major factor contributing to the exacerbation of symptoms of other diseases. The causes of low vitamin D can be very complex, but ensuring you get enough may be easier than you think.