Burqas and Vitamin D

If like me you've mentioned the connection between burqa,  niqab or similar and Vitamin D deficiency and related health effects only to get "That's bullshit!" in reply, direct them to this meta analysis published the Sultan Qaboos University Medical Journal from  Oman.

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Even in north African countries there is a high prevalence of low vitamin D status; 25(OH)D is in the rachitic range. Veiled women, or women wearing purdahs (cloth that covers the whole of the body), have a lower vitamin D status than their peers within the same country.

See further reading on NHI.