Comments by "Louise Hogg" (@louisehogg8472) on "What is the Origin and Reason for Red Hair?" video.
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Fair skin must help too, whereas blonds tend to tan, that is darken and that must block some UV?
Still only enough UV from May to September in Scotland though. So much so that vitamin D deficiency is 'normal' here. I take a supplement all year round, to prevent cold sores emerging in December.
Prior to starting that, I chose to go outside for half an hour every lunchtime, with face, hands and head exposed. And the cold sores (low immunity/low vitamin D) didn't start until a month later that year.
Apparently you need oily fish three times a day to get enough vitamin D in your diet during the winter.
Dad, whose family are much more redheaded than Mum's, maybe 2/3 redheads, also has a mild version of hemochromatosis. Not enough to need bled, but enough to prevent anaemia in the days when they used to kill most cattle in the winter and couldn't get iron in their diet all winter as a result. With green veg not having enough light to grow, or grass to feed the cattle.
His family originated on Skye, which is a couple of hundred miles further North. So he was adapted for low light (eyes), low UV light/vitamin D, AND low dietary iron (indirect consequence of the low UV light).
He does of course get depressed, which also goes with the red hair.
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