Sunday, June 14, 2009
More Vitamin D News
In 22 studies of vitamin D, conducted with 3,670 participants, 48% to 100% of those with musculoskeletal pain displayed vitamin D deficiencies. With supplementation, almost all reported a lessening or complete elimination of bone and muscle pain. Another study of 360 participants with back pain showed that all had insufficient levels of vitamin D, and 95% showed relief after three months of supplementation, assuming there was no injury, such as a slipped disc. A study at the University of Minnesota noted that the majority of those with severe deficiency were under the age of 30. Studies of over 40,000 participants taking vitamin D showed a reduction in hip fractures by 18%.
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Mad dogs and ....
"How can vitamin-D deficiency exist despite lengthy sun exposure? This apparent paradox was raised in my last post. The medical community now recommends bloodstream vitamin D levels of at least 75-150 nmol/L, yet these levels are not reached by many tanned, outdoorsy people.[...]
Only mega-doses can overcome what seems to be a homeostatic mechanism that keeps bloodstream vitamin D within a certain range. Indeed, this range falls below the one that is now recommended. Curious isn't it? Why would natural selection design us the wrong way? [...]
In a wide range of traditional societies, people avoided the sun as much as possible, especially during the hours of peak UV (Frost, 2005, pp. 60-62). Midday was a time for staying in the shade, having the main meal, and taking a nap. Nor is there reason to believe that sun avoidance and clothing were absent among early modern humans. Upper Paleolithic sites have yielded plenty of eyed needles, awls, and other tools for making tight-fitting, tailored clothes."
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