http://wikiislam.net/wiki/Health_Effects_of_Islamic_Dress
Health Effects of Islamic Dress
Islamic Dress and Health
Since almost all the daily intake of Vitamin D is from sunlight, exposure there is significant concern for women who wear the burqa or "full hijab".
This style of dress, leaving only a very small portion of skin around the eyes exposed, greatly reduces the surface area of the body which sunlight is exposed to and hence reduces the amount of Vitamin D synthesized.
Such low rates of Vitamin D production will quickly exhaust the bodies excess emergency stores of Vitamin D contained in the fat and the person will likely go into a deficient state.
Due to this reason, serious vitamin D deficiency is wide-spread in many Muslim majority countries.
A study performed by doctors at King Fahd University Hospital in Saudi Arabia, showed that out of all 52 women tested, all had seriously deficient levels of Vitamin D and were at risk of many serious health problems, despite living in one of the sunniest places on the planet.
Furthermore, in a study undertaken in Jordan, 83.3% of women wearing the most covering style of Islamic dresses were found to be deficient in summer time. This is rather striking when compared to the fact only 18.2% of Jordanian men studied were found to be deficient.[11] Jordan, like Saudi Arabia, holds the distinction of being one of the sunniest places on the planet, so the effect of wearing the burqa on Vitamin D levels and health is profound.
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