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Indoor lifestyles: Walls, roofs, and even windows block the sun. It is also cold in the Winter, so the next two bullet points (indoor lifestyles and clothes) are even more common. Season: Winter and early Spring at high latitudes: The Winter sun is too low in the sky, especially if you are far north (or south), to help with much, if any, vitamin D synthesis. Latitude: People who live at higher latitudes (closer to the poles, farther from the equator) are more likely to be vitamin D deficient than are those who live closer to the equator. What are the risk factors for Vitamin D deficiency?īecause sunlight is our primary source of vitamin D, things that block or reduce sunlight are risk factors for vitamin D deficiency 16:
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Should you be hungry for more details on the health implications of vitamin D deficiency, Holick 2007 15 provides an exhaustive review.
VITAMIN D VIDEO ADWARE SKIN
Doctors and public health officials advising us all to restrict our sun exposure lest we get skin cancer were-once again-basing their recommendations on reductionist, a-evolutionary science, and likely caused more harm than good. Even more surprising, greater exposure to sunlight is also associated with a reduction in the risk of death from malignant melanoma 14. Here are just two: Greater exposure to sunlight is associated with reduction of risk of developing multiple sclerosis 13.
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Given that the vast majority of our vitamin D is gained through sun exposure, it is also of interest to investigate what diseases and conditions correlate with sun exposure. This is consistent with growing evidence that vitamin D functions in regulating the immune system, has many anti-viral properties, and that supplementation with it provides protection against many respiratory infections 12. Vitamin D deficiency is also a significant risk factor for HIV patients 10, and likely increases susceptibility of populations to seasonal influenza 11.
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Supplementation with vitamin D in infancy decreases the later development of type I diabetes 9. Vitamin D deficiency is also associated with increased risk of metabolic syndrome 8. Just a few specific health outcomes include that vitamin D deficiency causes bone and muscle weakness and increasing vitamin D reduces the risk of fractures, falls, periodontal disease, and colorectal cancer 7. Vitamin D is understood to decrease the risk of chronic illnesses ranging from autoimmune disease to cardiovascular disease to infectious disease. The majority of human tissues and cells have a vitamin D receptor. Also contributing to those people’s success was the consumption of vitamin D rich foods 6, like fish, eggs, and organ meats, especially liver. That said, vitamin D is stored in fat for a long time 5, which is presumably part of how people who lived in far northern (or, far more rarely, far southern) climes survived the Winters without experiencing deficits, before vitamin D supplements existed. Compound the two-winter and high latitude-and nearly no vitamin D synthesis occurs. Winter, too, poses a problem for vitamin D synthesis, due both to the lower angle of the sun in the sky (such that its rays pass through more blocking atmosphere before reaching us), and the fewer hours that the sun is above the horizon. The farther you get from the equator, the less intense the sunlight is-and therefore the less capable it is of helping you create vitamin D. It can also be acquired through the diet, although greater than 90% of the vitamin D supply of our species is understood to be derived from exposure to ultraviolet B light, specifically from the sun 4. Vitamin D is synthesized in your skin, upon exposure to the sun. But with particular regard to whether WEIRD 3os ought to supplement with vitamin D, we (both Bret and I) now believe that we were wrong. Our broader point stands, including that we moderns are making matters worse with many of our lifestyle choices, such as spending too much time inside, and slathering ourselves with sunscreen when we do venture out. In A Hunter-Gatherer’s Guide to the 21st Century, Bret Weinstein and I contend that the rush to supplement with vitamin D is yet another example of reductionist, metric-heavy thinking that passes for modern medicine and science ( excerpted here). Others have argued that widespread vitamin D deficiency may be a symptom, not a cause, of ill-health 2. Vitamin D deficiency is so widespread, and so predictive of bad health outcomes, that it has itself been called a pandemic by many scientists, even in the title of at least one peer-reviewed scientific paper 1.