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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.
Low levels of vitamin D can be attributed to a number of behaviors and conditions. Insufficient exposure to sunlight is among the top reasons vitamin D levels are low. Many parts of the world do not see sunlight for a majority of the year, limiting the opportunity for adequate exposure. In other areas, certain cultures require individuals to wear clothing that inhibits sun exposure.