111–120 of 308 posts
> Because physical exams are performed in mobile vans in NHANES, data could not be collected in northern latitudes during the winter Why not?
Probably due to road conditions during the winter season. Imagine asking someone who isn't used to driving on icy roads to drive a large van full of equipment up through the Rockies
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That's an absurd analogy. Vitamin D is a vitamin that is in large part derived from significant sunlight exposure. Vitamins are essential by definition. Sunlight exposure is highly insufficient by historical standards. This is why supplementation is absolutely necessary in almost everyone who is not a full time outdoor worker. In contrast, the air contains oxygen which is sufficient for most people with normal lung f…
If most people have a significant Vitamin D deficiency, then I agree that my comparison was absurd.
Earlier quoted context omitted.
That's an absurd analogy. Vitamin D is a vitamin that is in large part derived from significant sunlight exposure. Vitamins are essential by definition. Sunlight exposure is highly insufficient by historical standards. This is why supplementation is absolutely necessary in almost everyone who is not a full time outdoor worker. In contrast, the air contains oxygen which is sufficient for most people with normal lung f…
If most people have a significant Vitamin D deficiency, then I agree that my comparison was absurd.
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Yeah, it's just a holdover, the term "vitamin" originated from "vital amine", and vitamin D doesn't even have an amine group
Well neither does Vitamin C.
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Not to mention, northern latitudes get more sun that average in summer, and most northern countries have more reasonable working hours so people actually do go outside.
More hours of sun, but it's less intense.
https://news.ycombinator.com/item?id=17638508
I ultimately stopped it because it seemed to cause lower back aches. (Pretty sure, bone/muscle not kidney!) Every time I went on the D3, my back would start to hurt. That repeated several times, enough to suspect a pattern.
The cause may be similar to the itchy, tingling teeth.
According to this fascinating paper, Vitamin D can actually trigger the leaching of calcium out of bones, into circulation:
https://pmc.ncbi.nlm.nih.gov/articles/PMC8147670/
After the abstract, find the section heading "Vitamin D mobilizes calcium from calcified bone".
But that is in very high, pharmacological doses. Not your 5000 UI per day.
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More hours of sun, but it's less intense.
The sun in northern countries in summer is less intense?
For example, in Florida in the summer, the sun is close to directly overhead at noon. In Scandinavia in the summer, the sun is only about halfway up the sky from the horizon at noon.