Technically not a vitamin, but a secosteroid, Vitamin D has receptors mapped to more than 3000 human genes, and is instrumental in resistance to pretty near the whole gamut of human bodily disorder, ranging from alzheimers, asthma, allergies, a lot of cancers, heart disease, bones, to mental health.
Fortunately, the greatest source of it is generated by the body itself through exposure to the sun, simple as that, converting a form of cholesterol to the vital calci-compounds.
I bet the reason why rural kids have a lot less problem with allergies and asthma is that theyre outdoors more.
And Maori need to get outdoors more than anyone here, darker skin inhibits the process so we need more exposure.
Ian Wishart's done a service by bringing all this stuff together.
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