Info About Health And Risk Assessment

Vitamin D is known for its ability to help in building strong bones. Insufficient vitamin D leads to weak bones (rickets), but even modest deficiencies can lead to chronic degenerative diseases. Numerous foods from cereal to milk are routinely supplemented with vitamins, but dietary vitamin D is not enough. The major source of vitamin D is the conversion of cholesterol derivatives in the skin and this reaction requires the ultraviolet rays in sunlight. Most individuals do not eat or make enough vitamin D to avoid vitamin D deficiency, hypovitaminosis D.

Sun Exposure Produces Vitamin D but Results Differ

The current recommended daily dose of vitamin D3 is 200 IU per day. Standing in the sun with the upper body exposed produces approximately 1,000 IU of vitamin D per minute. The RDA is clearly insufficient to compensate for inadequate solar production and some authorities are now recommending in excess of 2,000 IU daily.

There are many variables in skin production of vitamin D

• Melanin, the black/brown pigment in skin, blocks vitamin D production and darker skin produces less vitamin D in sunlight.
• Solar intensity is less further north and less in winter. Less sunlight means less vitamin D.
• Sun screen reduces vitamin D production.
• Chronic inflammation seems to reduce the skin’s ability to produce vitamin D even in sunlight.

African Americans, Hispanics are Prone to Vitamin D Deficiency and CVD

A recent study found an association between low vitamin D, as measured in blood, and the incidence of cardiovascular disease (CVD) in African American and Hispanics. Individuals with lower serum levels of vitamin D were at higher risk of CVD. Individuals with higher levels of skin pigmentation were found to be more likely to have vitamin D deficiency.

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