Vitamin D Deficiency

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In my book, Statin Drugs Side Effects and the misguided war on cholesterol, and on this website I have discussed the vital role of cholesterol in the human body. Our most important hormones depend upon adequate reserves of cholesterol for their production and nowhere is this more important than as the precursor substance for the synthesis of Vitamin D, known also as calcitrol.

Researchers in this field are sufficiently concerned from the results of their studies to pronounce that we are in the midst of an epidemic of vitamin D deficiency of immense proportion. Study after study of nursing home populations, of nursing mothers, of healthy male and female volunteers and of various children's groups have consistently documented how relatively rare it is to have optimal levels of Vitamin D.

Some authorities support more liberal dietary supplementation of vitamin D in our food products. Others are urging that practical new approaches for vitamin D repletion in our country are urgently needed. This high prevalence of vitamin D deficiency, even in those taking multivitamins, indicates that a critical review of vitamin D needs is a major priority.A vitamin D precursor is synthesized in the skin from cholesterol in response to absorbing UVB rays. It then gets converted in the liver to an intermediate form. In the kidneys it joins with an important enzyme for conversion into its active hormonal form.

Many factors potentially interfere with the UVB conversion. People having darker skins are much more likely to have vitamin D deficiency. The aged skin of the elderly impairs cholesterol conversion as does the presence of obesity. Our present day emphasis on protecting our skin from the sun, using sun-screens and blockers, also cuts down on the ability of UVB to convert cholesterol to vitamin D. Last but not least, one needs UVB exposure.

Without any sun exposure you need about 4,000 units of vitamin D a day. In the absence of other supplements you would need 40 glasses of milk or ten multi-vitamins capsules daily to supply your vitamin D needs. Most of us make about 20,000 units of vitamin D after 20 minutes of summer sun due to UVB conversion of cholesterol. Numerous studies document that the majority of our society falls short of meeting either their dietary or UVB conversion needs for vitamin D.

 

Now consider the impact of statin drugs on a society already overburdened with an epidemic of vitamin D deficiency. Cholesterol must be available in our bodies in amounts sufficient to allow UVB conversion to vitamin D. We are all genetically blessed with a "natural level" of cholesterol. What is natural for one person may be completely inadequate for another. Into this heterogenous pool we dump statins indiscriminately in a misguided attempt to bring everyone's natural level of cholesterol down to some artificially low level.

I cannot think of anything more likely to aggravate our already immense, vitamin D deficient state. There is little doubt that the availability of statins drugs these past two decades has made a major contribution to this problem.

Duane Graveline MD MPH Former USAF Flight SurgeonFormer NASA AstronautRetired Family Doctor

http://www.spacedoc.net/statins_vitaminD.html

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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