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Should vitamin D supplements be recommended to prevent chronic diseases?

BMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h321 (Published 29 January 2015) Cite this as: BMJ 2015;350:h321

Re: Should vitamin D supplements be recommended to prevent chronic diseases?

I have a special interest - I am ancient, and suffer from Eczema of recent onset.

1.Could the authors, or indeed anyone else, please explain the mechanism through which “Vitamin D,” helps in any of the chronic diseases other than those of bone metabolism?

2. It is lost in the mists of time, but I seem to recall thst Vit A and Vit D were reportedly antagonistic.
Is it now considered to be false? And if it is true, how does the human body cope with it?

3. Given that the melanin concentration of the Caucasian population of Norway, and the Eskimo population of the same country evolved separately, with perhaps differing mechanisms of vitamin absorption and vitamin D production in the skin, are there different ways in which these people cope with the same poor level of ultraviolet light?

Thank you.
Dr JK Anand

Competing interests: Please see the text

21 January 2019
JK Anand
Retired doctor
Free spirit
Peterborough, England (there are Peterboroughs in Australia, USA and Canada - with different levels of sunshine)