Breast cancer breakthrough. 
By Marc Sorenson, EdD. Sunlight Institute
Stunning Breast Cancer research shows that the highest vitamin D levels associate with an 80% reduction in risk.[1]
Is the breast cancer pandemic due to vitamin D deficiency?
First of all, as pointed out by the authors, numerous studies have shown an association between higher vitamin D level and breast cancer. But, other studies had not taken into consideration serum levels of vitamin D above 40 ng/ml. Why? Because that level had been considered the highest level needed for good health. Nevertheless, this study showed differences in breast cancer risk when comparing all serum vitamin D levels, and that made all the difference in the results. The research included 5,038 women
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A dose-response association between vitamin D levels and breast cancer
The most noteworthy finding can be summed up in the study conclusions: “Higher 25(OH)D concentrations were associated with a dose-response decrease in breast cancer risk with concentrations ≥60 ng/ml being most protective.” In other words, the higher the vitamin D levels, the greater was the protection.
This fact is especially relevant: serum vitamin D levels in 90% of the population are effected by sun exposure. Hence, sun exposure may be the operative factor in the comparisons. Sun exposure causes the body to produce nitric oxide, serotonin, endorphin and brain-derived neurotropic factor (BDNF). Most noteworthy is that all of these photoproducts are vital to human health.
Is something besides vitamin D at work in preventing breast cancer?
Therefore, it could be that these additional photoproducts added power to the vitamin D produced by the sun. Could the “holistic” sun be more important than vitamin D alone? Of course it is! Another study, little known, may hold the answer. An investigation from Iran, on the association between breast-cancer risk and vitamin D, showed that low vitamin D predicted only a slightly increased risk of the cancer. However, among women who totally covered themselves and thereby had no sun exposure, there was a 10-fold increase in the risk of the disease.[2] In other words, there was a 1,000% increase in breast cancer risk due to sun deficiency.
Summary:
Finally, consider this: With the holistic sun, we get the entire package, not just vitamin D. Embrace the Sun, and don’t burn.
For more on the study, see the press release put out by the Vitamin D Society: http://www.vitamindsociety.org/press_release.php?id=58
[1] Sharon L. McDonnell , Carole A. Baggerly, Christine B. French, Leo L. Baggerly, Cedric F. Garland, Edward D. Gorham, Bruce W. Hollis, Donald L. Trump, Joan M. Lappe. Breast cancer risk markedly lower with serum 25-hydroxyvitamin D concentrations ≥60 vs <20 ng/ml (150 vs 50 nmol/L): Pooled analysis of two randomized trials and a prospective cohort. PLoS One. 2018 Jun 15;13(6)
[2] Bidgoli SA, Azarshab H. Role of vitamin D deficiency and lack of sun exposure in the incidence of premenopausal breast cancer: a case control study in Sabzevar, Iran. Asian Pac J Cancer Prev. 2014;15(8):3391-6.