3 ms·

Out of curiosity: why haven’t official recommendations changed in the three years since this was published? Is it flawed?

by jolux 6y ago

jrumbut 6y ago
From the article: "Undeniably, further studies are needed to clarify the optimal supplementation of vitamin D, although it is uncertain whether a universal recommended dietary allowance is feasible." So perhaps they've established the RDA is too low, but the article itself says they haven't nailed down what the new recommendation should be. That's probably more than a 3 year process (now massively disrupted) assuming that consensus is building in the direction.
wgjordan 6y ago
The original 2011 report [1] was updated with a note mentioning that an official review conducted in 2017 [2] concluded the official recommendation probably wouldn't have been any different despite the statistical error, so they didn't change them. [1] https://www.nap.edu/catalog/13050/dietary-reference-intakes-for-calcium-and-vitamin-d https://www.nap.edu/catalog/13050/dietary-reference-intakes-... [2] https://www.nap.edu/resource/13050/FINAL%20Vitamin%20D%20Phase%20II%20Panel%20Report_11-17-17.pdf https://www.nap.edu/resource/13050/FINAL%20Vitamin%20D%20Pha...
lhl 6y ago
Recommendations/guidelines can take a long time (years, decades even) to change, especially if they've been long-standing. FWIW, the Endocrine Society has been raising its recommendations for years now: Holick, Michael F., Neil C. Binkley, Heike A. Bischoff-Ferrari, Catherine M. Gordon, David A. Hanley, Robert P. Heaney, M. Hassan Murad, and Connie M. Weaver. “Evaluation, Treatment, and Prevention of Vitamin D Deficiency: An Endocrine Society Clinical Practice Guideline.” The Journal of Clinical Endocrinology & Metabolism 96, no. 7 (July 1, 2011): 1911–30. https://doi.org/10.1210/jc.2011-0385 https://doi.org/10.1210/jc.2011-0385. I've probably posted this exact reference before but there's research going back decades showing that without sun exposure, almost everyone will be Vitamin D deficient: "CONCLUSIONS: Healthy men seem to use 3000-5000 IU cholecalciferol/d, apparently meeting > 80% of their winter cholecalciferol need with cutaneously synthesized accumulations from solar sources during the preceding summer months. Current recommended vitamin D inputs are inadequate to maintain serum 25-hydroxycholecalciferol concentration in the absence of substantial cutaneous production of vitamin D." Heaney, Robert P., K. Michael Davies, Tai C. Chen, Michael F. Holick, and M. Janet Barger-Lux. “Human Serum 25-Hydroxycholecalciferol Response to Extended Oral Dosing with Cholecalciferol.” The American Journal of Clinical Nutrition 77, no. 1 (January 2003): 204–10. https://doi.org/10.1093/ajcn/77.1.204 https://doi.org/10.1093/ajcn/77.1.204. Recommending sun exposure has been somewhat anathema, but I think more and more people are finally coming around that humans are evolved to need a lot more sunlight than most of us are getting... Baggerly, Carole A., Raphael E. Cuomo, Christine B. French, Cedric F. Garland, Edward D. Gorham, William B. Grant, Robert P. Heaney, et al. “Sunlight and Vitamin D: Necessary for Public Health.” Journal of the American College of Nutrition 34, no. 4 (July 4, 2015): 359–65. https://doi.org/10.1080/07315724.2015.1039866 https://doi.org/10.1080/07315724.2015.1039866.

Out of curiosity: why haven’t official recommendations changed in the three years since this was published? Is it flawed?

by jolux 6y ago

Out of curiosity: why haven’t official recommendations changed in the three years since this was published? Is it flawed?

jrumbut 6y ago

From the article: "Undeniably, further studies are needed to clarify the optimal supplementation of vitamin D, although it is uncertain whether a universal recommended dietary allowance is feasible." So perhaps they've established the RDA is too low, but the article itself says they haven't nailed down what the new recommendation should be. That's probably more than a 3 year process (now massively disrupted) assuming that consensus is building in the direction.

wgjordan 6y ago

The original 2011 report [1] was updated with a note mentioning that an official review conducted in 2017 [2] concluded the official recommendation probably wouldn't have been any different despite the statistical error, so they didn't change them. [1] https://www.nap.edu/catalog/13050/dietary-reference-intakes-for-calcium-and-vitamin-d https://www.nap.edu/catalog/13050/dietary-reference-intakes-... [2] https://www.nap.edu/resource/13050/FINAL%20Vitamin%20D%20Phase%20II%20Panel%20Report_11-17-17.pdf https://www.nap.edu/resource/13050/FINAL%20Vitamin%20D%20Pha...

lhl 6y ago

Recommendations/guidelines can take a long time (years, decades even) to change, especially if they've been long-standing. FWIW, the Endocrine Society has been raising its recommendations for years now: Holick, Michael F., Neil C. Binkley, Heike A. Bischoff-Ferrari, Catherine M. Gordon, David A. Hanley, Robert P. Heaney, M. Hassan Murad, and Connie M. Weaver. “Evaluation, Treatment, and Prevention of Vitamin D Deficiency: An Endocrine Society Clinical Practice Guideline.” The Journal of Clinical Endocrinology & Metabolism 96, no. 7 (July 1, 2011): 1911–30. https://doi.org/10.1210/jc.2011-0385 https://doi.org/10.1210/jc.2011-0385. I've probably posted this exact reference before but there's research going back decades showing that without sun exposure, almost everyone will be Vitamin D deficient: "CONCLUSIONS: Healthy men seem to use 3000-5000 IU cholecalciferol/d, apparently meeting > 80% of their winter cholecalciferol need with cutaneously synthesized accumulations from solar sources during the preceding summer months. Current recommended vitamin D inputs are inadequate to maintain serum 25-hydroxycholecalciferol concentration in the absence of substantial cutaneous production of vitamin D." Heaney, Robert P., K. Michael Davies, Tai C. Chen, Michael F. Holick, and M. Janet Barger-Lux. “Human Serum 25-Hydroxycholecalciferol Response to Extended Oral Dosing with Cholecalciferol.” The American Journal of Clinical Nutrition 77, no. 1 (January 2003): 204–10. https://doi.org/10.1093/ajcn/77.1.204 https://doi.org/10.1093/ajcn/77.1.204. Recommending sun exposure has been somewhat anathema, but I think more and more people are finally coming around that humans are evolved to need a lot more sunlight than most of us are getting... Baggerly, Carole A., Raphael E. Cuomo, Christine B. French, Cedric F. Garland, Edward D. Gorham, William B. Grant, Robert P. Heaney, et al. “Sunlight and Vitamin D: Necessary for Public Health.” Journal of the American College of Nutrition 34, no. 4 (July 4, 2015): 359–65. https://doi.org/10.1080/07315724.2015.1039866 https://doi.org/10.1080/07315724.2015.1039866.