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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.

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.

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.



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