Tag Archives: UVR

Of mice and men (or women): Sunlight reduces breast cancer beyond the effects of vitamin D. Another reason to embrace the sun.

Marc Sorenson, EdD, for breast cancer prevention. Prevent breast cancer with sunlight!

While many doctors know that ultraviolet radiation (UVR) from sunlight reduces risk of breast cancer, they have missed something. UVR stimulates production of vitamin D in human skin. Therefore, many health professionals assume that vitamin D is responsible for the reduced cancer risk. This may lead them to advocate the use of vitamin D supplementation and totally miss the bigger picture. In addition to vitamin D, UVR from sunlight or sunlamps produces many supplementary healthful photoproducts. Among others, nitric oxide, serotonin, endorphin and BDNF are produced by sunlight, and these photoproducts are vital to health. And, it is likely that these healthful photoproducts lead to an inhibition of breast cancer.

New research shows that sun exposure per se is capable of reducing the risk of breast cancer.

Consequently, it should not surprise us that for breast cancer, sunlight’s effects go beyond vitamin D.[1] Researchers at Children’s Hospital Oakland Research Institute, used a murine model (mice) that easily develops breast cancer, and treated them with UVR. Much as we might expect, they found that UVR treatments produced significant anti-cancer effects. Furthermore, they found that neither dietary vitamin D nor topical vitamin D influenced cancer risk. Because of their findings, they stated the following: “UVR’s inhibitory effects occur irrespective of whether or not the treatment increases circulating D3 in the mice.” Also, they made one more important comment regarding their research on breast cancer and UVR. “Therefore, supplemental D3 may not mimic all possible beneficial effects of UVR, and uncovering non-D3-mediated mechanisms of UVR tumor inhibition may lead to novel strategies for cancer prevention.”

An important point about vitamin D, sunlight and breast cancer.

Finally, there is no doubt that vitamin D has anticancer benefits. This research however, is especially relevant in that it corroborates what I have said in my soon-to-be-released book, Embrace the Sun. First of all, we must not put all of the benefits of sunlight in the vitamin D box. Secondly, sun exposure performs myriad miracles beyond vitamin D. One of those miracles may be breast cancer prevention and inhibition.  Thirdly, if we erroneously believe that we can obtain all of the sun’s benefits from popping a vitamin D pill, we may miss the holistic effects of the sun, which provide a cornucopia of salubrious results.

So, safely (without burning) embrace the sun and ease your mind about breast cancer.

[1] Anastasia M. Makarova, Flora Frascari, Parastoo Davari, Farzam Gorouhi, Philip Dutt, Lynn Wang, Akash Dhawan, Grace Wang, Jeffrey E. Green, Ervin H. Epstein, Jr. Ultraviolet radiation inhibits mammary carcinogenesis in an ER negative murine model by a mechanism independent of vitamin D3. Downloaded from cancerpreventionresearch.aacrjournals.org on April 12, 2018.

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Can the Quantity of Sunlight in the Birth Month alter the Longevity of Diabetics?

By Marc Sorenson, EdD. Sunlight Institute

One of the more interesting research papers in recent memory demonstrates that the amount of sunlight during the month of birth may increase the life span of adult diabetics.[1] The researchers studied the death records of 829,000 diabetics, 90% of whom were type 2. Among the most interesting findings was that with rapidly decreasing ultraviolet radiation (UVR or sunlight) at the time of birth, lifespan decreased in better nourished, white female diabetic population.

Diabetic males, on the other hand, gained 6.1 years of life when exposure to sunlight was increasing at birth month, whereas females gained 2.3 years.

This all makes perfect sense, since fall weather is a time of rapidly decreasing sunlight intensity and a drop in temperature, which would decrease vitamin D and other photoproducts, and cause people to be outdoors less.

The researchers concluded that “Rapidly changing UVR at the equinoxes modulates the expression of an epigenome involving the conservation of energy, a mechanism especially canalized in women. Decreasing UVR at conception and early gestation stimulates energy conservation in persons we consider ‘diabetic’ in today’s environment of caloric surfeit. In the late 19th and early 20th centuries ethnic minorities had poorer nutrition, laborious work, and leaner bodies, and in that environment a calorie-conserving epigenome was a survival advantage. Ethnic minorities with a similar epigenome lived long enough to express diabetes as we define it today and exceeded the lifespan of their nondiabetic contemporaries, while that epigenome in diabetics in the nutritional environment of today is detrimental to lifespan.”

So as I see it, those who are programmed genetically for diabetes can increase lifespan by being born at the right time of year. If only their parents had known!

[1] George E Davis Jr* and Walter E Lowell. Variation in ultraviolet radiation and diabetes: evidence of an epigenetic effect that modulates diabetics’ lifespan. Clinical Epigenetics 2013, 5:5.

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Sunlight is better than Vitamin D in Preventing Weight Gain.

Marc Sorenson, EdD, Sunlight Institute

Those of you who follow this blog remember that one of my posts regarding weight control showed that early-morning sunlight was inversely correlated to body weight and Body Mass Index (BMI).[1] The earlier in the day the sunlight exposure occurred, the slimmer was the figure or physique.[2]

Another scientific paper was recently published that “sheds more light” on the subject of obesity. This research was conducted on mice that were placed on a high-fat diet and then exposed to non-burning ultraviolet radiation (UVR) during a three-month experiment.[3] The mice, without the benefit of UVR, would have been expected to gain weight rapidly, but when they were exposed to UVR, the weight gain was impressively reduced; the UVR treatment achieved 30-40% less weight gain, compared to the expected weight gain with the high-fat diet. The amount of UVR exposure to the mice was proportionally equal to the amount of UVR that a human would be exposed to by standing for ten minutes at noon.

Other benefits included significant reductions in glucose intolerance, insulin resistance and fasting insulin levels (all markers and predictors of diabetes), nonalcoholic fatty liver disease measures and cholesterol. All of these factors, including obesity, are part of a cluster of maladies known as the metabolic syndrome, or MetS, which is indicative of deteriorating health and susceptibility to heart disease, diabetes and death. 

Other interesting findings:

Supplementation with vitamin D actually reduced the aforementioned beneficial effects. Dr. Shelley Gorman, one of the authors, made two interesting observations regarding the research:

  1. “These findings were independent of circulating vitamin D and could not be mimicked by vitamin D supplementation.”[4]
  2. “It looked like the presence of vitamin D in mice on the high fat diet prevented the [beneficial] effect of UV radiation on weight gain.”
  3. She also mentioned that the mechanism or weight loss may be dependent on nitric oxide (NO), which originates from diet and can be mobilized by UV radiation to become bioactive.[5]

In another part of the experiment, skin induction of nitric oxide (NO)—also a product of skin exposure to sunlight—reproduced many of the positive effects of UVR, something that vitamin D could not do.

The authors concluded their research thusly: “These studies suggest that UVR (sunlight exposure) may be an effective means of suppressing the development of obesity and MetS, through mechanisms that are independent of vitamin D but dependent on other UVR-induced mediators such as NO.

Research continues to mount about the positive effects of sunlight that are independent of vitamin D. This should in no way be construed to diminish the vital importance of vitamin D; rather, it is to make a point that sunlight works in many ways, among which are stimulating the production vitamin D, stimulating the production of NO, stimulating the production of serotonin and stimulating the production of endorphins. Why should we be satisfied with any one of these marvelous health aids when sunlight is available? With sunlight exposure, we can have them all.

 

[1] http://sunlightinstitute.org/675/

[2] Reid KJ, Santostasi G, Baron KG, Wilson J, Kang J, Zee PC. Timing and intensity of light correlate with body weight in adults. PLoS One. 2014 Apr 2;9(4).

[3] Geldenhuys S, Hart PH, Endersby R, Jacoby P, Feelisch M, Weller RB, Matthews V, Gorman S. Ultraviolet radiation suppresses obesity and symptoms of metabolic syndrome independently of vitamin D in mice fed a high-fat diet. Diabetes. 2014 Nov;63(11):3759-69

[4] http://www.sciencewa.net.au/topics/health-a-medicine/item/3618-sun-shines-light-on-obesity-challenge

[5] See footnote 4.

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