Based on reading about dress codes for women and recently seeing the movie Wadjda , which is set in Saudia Arabia
- Dress codes started when living in tribes and women may have only needed to cover themselves when there were outside male visitors
Plenty of access to the sun most of the time - Dress codes continued when people moved to cities
Women still got vitamin D in courtyards or rooftops - not wear excessive clothes when men from the family could not see them
Even being in the shade the women would get about 1/3 the amount of vitamin D/hour - Air conditioning became prevalent in the last portion of the 20th century, allowing people to escape the heat
Rate of Multiple Sclerosis in women has gone up 6X in the past 30 years in Tehran (MS is strongly related to lack of vitamin D) - Predict that rickets will make its appearance soon in the Middle East
Turkey managed to reduce rate of rickets by 60X by giving 400 IU of vitamin D to EVERY child
Hajab prevalence: Wikipedia
Nice dress code summary
Male Dominated Culture joke
See also Medical Publication
- Ethnicity, Clothing Style And Body Mass Index Are Significant Predictors Of Vitamin D Insufficiency In Germany Oct 2014
Turkish women in Germany were 3.6 X more likely to have low vitamin D(<30 ng)when they wore covered clothing