Poisons in the blood: Chemical Sunscreens.

Poisons in the blood: Chemical Sunscreens. 

Poisons in the blood. By Marc Sorenson, EdD.poisons chemical sunscreens

Poisons are something we want to avoid and reverse. Am I correct in that assumption? Yet, some scientists believe that if sunscreens are poisons, humans should continue using them until they do more research. So, suppose that people die, or develop a disease as that research takes place. Maybe then, we change our minds and say, “it seems like we made a mistake.”

We seem to be a group of guinea pigs

Sunscreen researchers seem to conclude that they need to do more investigations on blood absorption of sunscreen poisons. They would do this research while the guinea pigs (we the people) still use the poisons.

Naming and calling out the poisons

These researchers studied six different sunscreen chemicals and measured their absorption and retention in the blood. These chemicals were avobenzone, oxybenzone, octocrylene, homosalate, octisalate and octinoxate. The subjects applied the sunscreens (with all of these chemicals) to 75% of the skin. The investigators then measured residual chemical concentrations at varying periods up to 21 days. Thus, they found all chemicals produced blood concentrations that were well above the Food and Drug (FDA) safety thresholds. In one case (oxybenzone), the concentration reached 360-times the FDA threshold level for safety in four days. In addition, all six chemical concentrations were significantly above the FDA threshold after only one application.

So should we use poisons that have concentrations 3,600% above the FDA threshold?

 So what did these great scientists conclude? Here is their statement: “In the absence of clear data demonstrating harm, the use of chemical sunscreen may still be considered appropriate [Really?]. The use of mineral-based sunscreen is a well-established safe alternative. Elevating the science of the benefits and harms of sunscreen should be a priority. The sunscreen industry must begin conducting these safety studies as recommended by the FDA. Until then, the harms of absorption of sunscreen filters will remain uncertain.” I vehemently disagree; the harms of these toxic chemicals are well-known, and I personally do not want to absorb anything into my blood that exceeds the FDA safety thresholds by 3,600%. Chemicals that produce that excess are obviously poisons.

Are sunscreen chemicals either harmful or worthless?

The authors also indicate that sunscreens stop the development of skin cancer. Perhaps they have not read the research that indicates the direct opposite. For example, a meta-analysis published in the European Journal of Dermatology showed that there was no association between sunscreen use and skin cancer, including melanoma. Another study showed that those who used sunscreens had a far greater risk of sunburns than those who used other methods. Those other methods were seeking shade, wearing a hat or visor, and wearing long sleeves and pants. Another interesting fact is that those who used sunscreens had a 62% risk of sunburn. Those who did not use them but engaged in the aforementioned protective behaviors had a 24% risk.

What makes the term “poisons,” appropriate?

While these “researchers” are determining the sunscreen safety, and deciding if they are poisons, let us consider the research. Studies confirm that sunscreen chemicals are highly absorbed and then detected in urine and breast milk. This may cause systemic effects, including disruption of the endocrine system. In addition, pregnant mothers exposed to oxybenzone give birth to babies with low birth weights. This “programs” the developing child for greater risks of heart disease, hypertension, type-two diabetes and other diseases in adulthood. Furthermore, sun causes oxybenzone to become a potent allergen and to form free radicals. In fact, after one hour, more free radicals were created by sunlight contacting sunscreen, than sunlight on skin.” This is another indication that sunscreen use causes more damage than no sunscreens at all!

 Gender-bending properties of sunscreen chemicals

 Sunscreen chemicals also have potential “gender-bending” characteristics. They increase estrogen and decrease testosterone in men. In addition, they may be responsible for the nearly 50% reduction of sperm count in the last few decades. Sunscreen chemicals may cause the feminization of fish. in addition, environmental pollution by these and similarly structured chemicals may cause feminization in alligators and the gradual extinction of Florida panthers due to failure to breed. Sunscreens also increase the absorption of pesticides through the skin,

In conclusion, what are the environmental damages of sunscreen poisons?

Finally, the environmental damage may be substantial. Many beach areas have prohibited the use of sunscreen poisons due to concerns about coral-reef destruction.

So be careful when you next see a sunscreen advertisement. Protect yourself with clothing and shade when you feel that your sun exposure may become excessive. Sunscreen is not the answer. Regular, non-burning sun exposure is the answer.

Happy sunning.

Read more in our book, Embrace the Sun.

 

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flu taking its toll

Flu: Stop it before it stops you! Sunlight is the key.

Flu: stop it with sunlight. By Marc Sorenson, EdD.

Flu is a killer, and the angst regarding Chinese flu is reason to “enlighten” the world about healing sunlight.

First, the flu is serious and threatening. Tflu taking its tollhe Center for Disease Control (CDC) and others estimate that yearly deaths from flu range from about 12,000-80,000 per year. Additionally, (no surprise here), research also shows that cold and flu outbreaks are almost completely seasonal. In the northern hemisphere, they occur primarily in December through March. In the southern hemisphere, they occur June through September. Therefore, that is almost exclusively in winter in both hemispheres. In addition, the outbreaks in each case occur in times of lowest sun exposure.

Can the shots kill you?

So why not just a flu shot and some aspirin? Because flu shots, along with whatever good they do, can be fatal. One of our friends from California learned this the hard way. His doctors talked him into getting a flu shot to protect him from disease and discomfort. He then contracted a disease called Guillain-Barre (gee-yan-buh-rey) Syndrome.  Loss of muscle strength, loss of or altered sensation, and sometimes paralysis are manifestations of the disease. Our friend had all of those manifestations. He had previously been a hiker, and he enjoyed trekking for up to 100 miles carrying a pack. Guillain-Barre reduced him to a bedridden invalid, and ultimately killed him. Few people succumb to Guillain-Barre, but it seems like a mistake to take the chance. However, I am not telling you not to get a flu shot. That decision is between the patient and doctor.

Stop the the disease by using the most natural method available: regular, non-burning sun exposure.

Personally, the influence of seasons on my tendency to contract colds and flu had a highly significant influence on my interest in sunlight. Until the age of thirty-five, too much of my winter life was spent fighting flu and colds. My first head cold would occur in autumn around mid-November and would keep me in bed two or three days. The illness would then subside over several weeks. Then I would contract whichever flu or cold was in vogue. These ailments took a toll on my life. Most of my friends would suffer one cold per year while nature blessed with up to a half-dozen. Winter was an unhappy time, and I dreamed of leaving the cold weather of the central Nevada-Utah border and moving to warmer climes.

Then came the late spring, summer and early fall. Goodbye flu!

Then came the late spring, summer, anflu: stop it with sunlight.d early fall, when I mostly worked on my father’s ranch. The sun blazed from dawn to dusk and I soaked it up. The work on our ranch was intense. We started those sunny days with morning feeding of animals, followed by irrigating, hauling hay and performing other outdoor tasks. Despite the long hours, I loved the sun, and it made the hard work worthwhile. Whenever possible, my shirt came off, and because of my deep tan, my friends called me “brown man.”

Those were my halcyon days. I was happy and healthy and enjoyed a vigor that was lacking in winter. Later I realized there was never a flu or cold (or any other disease) under the summer sun. Whether this was due to increased vitamin D production of some of the other marvelous additional effects of sun exposure is unknown. Please remember that swallowing a vitamin D capsule can never provide the innumerable benefits of sunlight. BTW, after being a sun-seeker for most of my life, I have never had a skin cancer of any kind. Interesting for an older, blue-eyed, light-skinned Caucasian, who, according to the “experts,” should be a prime prospect for melanoma.

Stop the flu by using the most natural method available: regular, non-burning sun exposure.

The increased incidence of flu and colds during winter associates to sun deprivation. We know that most flu and colds occur in times of low sun exposure.

One of the most recent scientific analyses indicates a profound influence of sun exposure on flu. Researchers tested number of hours of sun exposure per week in Taiwanese children. In addition, they compared that to the incidence of flu among those children. Seven 7 hours of sun per week associated to a 33% reduced risk of influenza hospitalizations. Furthermore, in my opinion, 7 hours is not enough.

Would sunbed use also reduce risk?

Another possibility occurred to me several years ago and influenced my thinking. An elderly friend of mine asked how he could reduce the colds, flu and discomfort he was experiencing each winter. I suggested regular tanning-bed use. He followed the advice and the following winter had no sign of a cold. Either the UV light  protected him against his usual respiratory infections, or it was just luck. The research suggests it was the former, via increased 25(OH)D levels or due to other factors. Vitamin D stimulates the production of anti-microbial peptides that fight infection. For more information on sunbeds, visit this link.

When the sun is available, take advantage of it in a nRead this book and prevent reduce risk of breast cancer.on-burning fashion. If the sun is not available, use a sunbed in non-burning fashion. Stop the flu before it stops us! Happy sunning!

For more information on sunlight, flu and other diseases, visit http://sunlightinstitute.org/ and read my book, Embrace the Sun.

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Metabolic syndrome, obesity and internal sun.

 By Marc Sorenson, EdD.

Avoid metabolic syndrome with sun exposure

Metabolic syndrome, first of all, is a combination of disorders existing concurrently in a human or other animal. So what are these disorders? One can usually discern them with a glance at the people walking the American streets. They are abdominal obesity, high blood pressure, high triglyceride levels and low HDL cholesterol levels. And what are the dangers of metabolic syndrome? Most noteworthy are heart disease, stroke and diabetes, as well as obesity itself. Thus, metabolic syndrome is indicative of deteriorating health.

New, fascinating research has shown a link between metabolic syndrome and Lack of sunlight.

According to Medical News Today, animals can detect light in areas other than the eyes. Especially relevant are proteins called opsins, which detect light in the eye’s retinal cells. However, in addition, it is now known that opsins in the skins of mice can react to sunlight and help to reset circadian rhythms. Nevertheless, until now, it was not suspected that opsins could help to reduce metabolic syndrome.

Also of transcendent importance is the fact that opsins exist below the skin surface. They are also found on fat cells. And when sunlight contacts the skin, the light can penetrate deeply enough to stimulate opsin activities in those cells. Thus, opsins are “turned on” and activate the process of lipolysis, whereby fatty acids are released from the fat cell into the blood.

Another process then occurs: the fatty acids are “burned” by the body to produce heat. And the upshot of this progression?  It reduces obesity. And, metabolic syndrome lessens. Hence, the person achieves better health! I have almost come to believe that there is no aspect of human health that sun exposure cannot help, when used properly. In this study, blue light appeared to be the most important spectrum of sunlight.

Other research indicative of a positive effect on obesity. 

Another scientific paper “sheds more light” on the subject of obesity. This research was conducted on mice with shaved backs that were placed on a high-fat diet and then exposed to non-burning ultraviolet radiation (UVR) during a three-month experiment. The mice, without the benefit of UVR, would have been expected to gain weight rapidly on that diet, but when they were exposed to UVR, the weight gain was impressively reduced.

The UVR treatment achieved a 30-40% reduction in weight gain, compared to the expected weight gain with the high-fat diet. And, none of these benefits could be accomplished by vitamin D supplementation. However, stimulation of nitric oxide increase in the skin was able to produce some of the benefits of UVR. This also indicate that either sun exposure or sunbeds could help the health (we know that both do exactly that). However, it was not determined whether opsins had any part to play.

Finally, morning sunlight reduces obesity. Sunlight is essential for preventing disease.

A recent study demonstrates that timing and intensity of light correlate with body mass index (BMI).  BMI is a numerical computation comparing height and weight, and is a commonly used method to assess obesity or the lack thereof. A high BMI usually means a person is obese or at least approaching obesity.

After adjusting for confounders such as diet, exercise and timing of sleep, it was determined that very early exposure to morning light correlated remarkably to lower BMI. Even when light intensity was equal at different times of the day, those who received the earliest bright light had lower BMI. In fact, for each hour later in the day when light exposure occurred, BMI increased by 1.3 units. This is exceptionally important, since a person who has a BMI of 25 (upper ideal range) could approach 30 (obesity) by rising later.

Remember that regular, non-burning sun exposure is vital for human health. Happy sunning!

For more information on sunlight and health, visit http://sunlightinstitute.org/ and read the book, Embrace the Sun. The book is available at Amazon.

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Sunlight prevents Sexual dysfunction.

Sunscreen chemicals, breast cancer, diseases. Careful!

Sunscreen chemicals. By Marc Sorenson, EdD.

Soak up the sun and avoid sunscreen chemicals.Sunscreen chemicals are toxic. I have written about them previously and did an analysis of sunscreen chemicals dangers in my book, Embrace the Sun. And now, Science Digest alerts the public of new research.  It indicates that even low concentrations of sunscreen chemicals can stimulate breast tissue growth. Thus, these chemicals could lead to breast cancer. Nevertheless, these chemicals affected only breast cells that had estrogen receptors. The sunscreen chemical tested was oxybenzone, which mimics estrogen in some aspects. Oxybenzone and other similar chemicals are known as xenoestrogens.  They are also suspected of many injurious effects beyond possibly causing breast cancer.

Other deleterious effects of sunscreen chemicals 1

First of all, several years ago, the CDC released a study showing that 96.8% of Americans at age six are contaminated with oxybenzone. The study also showed that women were 3.5 times as likely to have high concentrations as men.[1] The authors suggest that women’s greater use of personal-care products, most of which contain sunscreens, is the reason for their higher degree of contamination. Oxybenzone is used in 588 sunscreens and in 567 other personal-care products.[2] Another investigation showed that up to 8.7% of oxybnezone is absorbed[3] and accumulates in the body.[4] It is still found in the urine 5 days after application.

Other deleterious effects of sunscreen chemicals 2

Other research papers confirm that sunscreen chemicals are highly absorbed and then detected in urine and breast milk, where they may cause systemic effects, including disruption of the endocrine system.[5], [6]

In addition, pregnant mothers exposed to oxybenzone gave birth to babies with low birth weights, [7] whichprograms” the developing child for greater risks of heart disease, hypertension, type-two diabetes and other diseases in adulthood.[8] Furthermore, sun causes the chemical to become a potent allergen[9], [10] and to form free radicals.[11], [12], [13], [14] Free radicals are unstable atoms which lack an electron in their outer shells. One study concluded, “The surprising result is UV filters applied to the skin surface not only lose their screening capability after a period of incubation, but also may lead to enhanced ROS [free radicals] generation in nucleated epidermis through photogeneration.“[15] In fact, after one hour, more free radicals were created by sunlight contacting sunscreen, than sunlight on skin. To me, this is another indication that sunscreens cause more damage than no sunscreens!

Other deleterious effects of sunscreen chemicals 3

In addition to adverse effects on human health, sunscreen chemicals have potential deleterious effects on the environment. A study from the Archives of Environmental Contamination and Toxicology, regarding the detrimental effects of Oxybenzone, stated that Oxybenzone is a photo-toxicant, meaning its adverse effects are exacerbated in the light.[16] Does this toxic chemical sound like something you’d like to apply to your skin or your children’s skin while out in the sun?

The researchers also stated: “Oxybenzone is an emerging contaminant of concern in the marine environment.” They found that a small dollop of sunscreen in six Olympic-sized pools caused a disruption of coral growth. Such disruption leads to a whitening and killing of the marine activity of coral reefs. This is accomplished by ossification of a free-swimming larva called a planula, which kills the growth of coral reefs. And this information has proven to be prophetic. Many beach areas have now prohibited the use of sunscreen chemicals due to concerns about coral-reef destruction.

The final nail in the coffin for sunscreen chemicals: they may lead to sunburns.

I have often stated that sunscreens may be worthless at best and dangerous at worst. Another scientific study accidentally corroborated my conclusion.[17] The researchers wanted to discover which sun-protection behavior was most effective in preventing sunburn. Hence, they designed a cross-sectional investigation using a nationally representative sample of about 32,000 US adults. They interviewed each participant in person. This is especially relevant when attempting to achieve the most accurate results possible. We can conclude, therefore, that their findings regarding sunscreen use and other “sun-protective” behaviors probably have validity. Seeking shade, wearing a hat or visor, and wearing long sleeves and or pants were other sun-protective behaviors included.

The results:

Fifty-four percent of the subjects were women, and 15,992 of all individuals were considered sun-sensitive (fair skinned).  Those who used only sunscreen had the highest sunburn likelihood (62.4%). Also, the group with lowest likelihood of sunburn did not use sunscreen, but engaged in the other protective behaviors (24.3% sunburned).  In addition, among 12,566 non–sun-sensitive individuals, those engaged in all 4 protective behaviors had the lowest sunburn (6.6%). The highest likelihood of sunburn was among those who used only sunscreen (26.2%). “The most surprising and counterintuitive finding was that regular sunscreen use, in the absence of other protective behaviors, was associated with the highest likelihood of sunburn.” according to Kasey Morris, who led the study.

Finally, a meta-analysis of the best research, involving 313,000 subjects found that neither melanoma nor non-melanoma skin cancer was associated with sunscreen use. And, another study indicated that in the last three decades, melanoma incidence has increased by 400% and sunscreen use has also increased by 400%. Isn’t it time that we stopped using this toxic, chemical soup?

 

 

 

Sunlight is essential for preventing disease.

 

 

 

Think carefully about this information when you next see a sunscreen ad. Enjoy the sun safely (without burning).

Happy sunning

[1] Calafat, A. Concentrations of the Sunscreen Agent, Benzophenone-3, in Residents of the United States: National Health and Nutrition Examination Survey 2003–2004. (Available at http://dx.doi.org/).

[2] Environmental Working Group: Americans Carry Body Burden of Toxic Sunscreen Chemical.  25, 2008. (Available at http://www.ewg.org/node/26212).

[3] Hayden CG, Roberts MS, Benson HA. Systemic absorption of sunscreen after topical application. Lancet 1997:350:863-64.

[4] Gonzalez H, Farbrot A, Larkö A-M. Wennberg A. Percutaneous absorption of the sunscreen benzophenone-3 after repeated whole-body applications, with and without ultraviolet irradiation. British J Dermatol 2016;154:137-140.

[5] Krause M, Klit A, Blomberg Jensen M, Søeborg T, Frederiksen H, Schlumpf M, Lichtensteiger W, Skakkebaek NE, Drzewiecki KT. Sunscreens: Are they beneficial for health? An overview of endocrine disrupting properties of UV-filters. Int. J. Androl. 35, 424436 (2012).

[6] Yang Deng, Asiri Ediriwickrema, Fan Yang, Julia Lewis, Michael Girardi and W. Mark Saltzman. A sunblock based on bioadhesive nanoparticles. Nature materials: published online: 28 September 2015.

[7] Mary S. Wolff, Stephanie M. Engel, Gertrud S. Berkowitz, Xiaoyun Ye, Manori J. Silva, Chenbo Zhu, James Wetmur, and Antonia M. Calafat. Prenatal Phenol and Phthalate Exposures and Birth Outcomes. National Institutes of Health USA Department of Health and Human Services.(available at http://dx.doi.org/)

[8] Lau C, Rogers JM. 2004. Embryonic and fetal programming of physiological disorders in adulthood. Birth Defects Res C Embryo Today 2004;72:300-12.

[9] Bryden AM, Moseley H, Ibbotson SH, Chowdhury MM, Beck MH, Bourke J, English J, Farr P, Foulds IS, et al. Photopatch testing of 1155 patients: results of the U.K. multicentre photopatch group. B J Dermatol 2006;155:737-47.

[10] Rodriguez E, Valbuena MC, Rey M, Porras de Quintana L. 2006. Causal agents of photoallergic contact dermatitis diagnosed in the national institute of dermatology of Colombia. Photodermatol Photoimmunol Photomed 2006;22:189-92.

[11] Hanson KM, Gratton E, Bardeen CJ. Sunscreen enhancement of UV-induced reactive oxygen species in the skin. Free Radic Biol Med. 2006 Oct 15;41(8):1205-12.

[12] Bastien N, Millau JF, Rouabhia M, Davies RJ, Drouin R. The sunscreen agent 2-phenylbenzimidazole-5-sulfonic acid photosensitizes the formation of oxidized guanines in cellulo after UV-A or UV-B exposure. J Invest Dermatol. 2010 Oct;130(10):2463-7

[13] Gulston M, Knowland J. Illumination of human keratinocytes in the presence of the sunscreen ingredient Padimate-O and through an SPF-15 sunscreen reduces direct photodamage to DNA but increases strand breaks. Mutat Res. 1999 Jul 21;444(1):49-60.

[14] Environmental Working Group: Americans Carry Body Burden of Toxic Sunscreen Chemical.  25, 2008. (Available at http://www.ewg.org/node/26212).

[15] Hanson KM, Gratton E, Bardeen CJ. Sunscreen enhancement of UV-induced reactive oxygen species in the skin. Free Radic Biol Med. 2006 Oct 15;41(8):1205-12.

[16] C. A. Downs , Esti Kramarsky-Winter, Roee Segal, John Fauth, Sean Knutson, Omri Bronstein, Frederic R. Ciner, Rina Jeger, Yona Lichtenfeld et al. Toxicopathological Effects of the Sunscreen UV Filter, Oxybenzone (Benzophenone-3), on Coral Planulae and Cultured Primary Cells and Its Environmental Contamination in Hawaii and the US Virgin Islands. Archives of Environmental Contamination and Toxicology Oct 20 2015.

[17] Kasey L. Morris, PhD; Frank M. Perna, EdD, PhD. Decision Tree Model vs Traditional Measures to Identify Patterns of Sun-Protective Behaviors and Sun Sensitivity Associated With Sunburn. JAMA Dermatol. Published online June 27, 2018.

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Sunbeds for heath and lonevity

Sunbeds are unjustly criticized. Learn the truth!

Sunbeds can be healthful devices. By Marc Sorenson, EdD.

Sunbeds, also known as tanning beds, have many healthful properties. They produce vitamin D, strengthen bone and reduce the risk of major cancers. Yet, sunbeds are much maligned as being a major cause of melanoma. Thus, teens in many areas have been banned from using them by misguided legislation. In addition, tanning- salon owners must live in fear of government overreach that could put them out of business.

But new research shows that the attack on sunbeds is misguided.

Because of this uproar, a group of scientists (some dermatologists), led by Dr. Jörg Reichrath, did a thorough research review. Furthermore, they published their findings in the scientific journal Anticancer Research, which presented truth about melanoma and sunbeds. This information is most noteworthy since it is contrary to the prevailing papers that emanate from the Powers of Darkness. The Powers of Darkness are those who love to attack both sun exposure and sunbeds.

Especially relevant points regarding sunbeds and melanoma risk, from Anticancer Research:

  1. First of all, Reichrath and colleagues performed a systematic literature search. This research was undertaken to identify and evaluate research that investigated relationship of solarium use (sunbed use) and melanoma risk. And as a result, they stated the following: “We found no studies that demonstrate a causal relationship between moderate solarium use and melanoma risk.” In addition, they indicated that the quality of the observational studies was low and that bias may have existed.
  2. Another interesting finding was that although moderate sunbed use had no effect on melanoma, something else did affect melanoma. An unhealthy lifestyle involving extensive sunbathing, alcohol and smoking associated to a 20% increase in the disease. Also, the researchers mention that individuals with unhealthful lifestyles use tanning salons more often.

At this time, I must make a point. Those who are regularly in the sun have stronger bones and less cancer than sun avoiders. So I’m not sure what “extensive” sunbathing entailed. And, another point is this: As time spent in the sun has decreased profoundly in both Europe and the U.S., melanoma has increased exponentially. Read my book, Embrace the Sun, to see the discussion on this topic.

Could sunbeds actually decrease the risk of melanoma?

Another salient finding of the research review: A study from Europe showed that sunbed use was associated with a 30% reduced risk for developing melanoma. Reichrath and colleagues made this comment on that study: “Those findings indicate that solarium [sunbed] use may even have a protective effect.”

Sunbeds: beyond melanoma. Here are a few truths about sunbeds that are seldom discussed:

The transcendent sunbed study showed that during 20-years, women who used them reduced all-cause mortality by 23%.  So let’s suppose that that there were some health problems with using sunbeds. That negative possibility pales in comparison to the remarkably reduced risk of death, does it not? And, I am not stating that there were negatives for sunbed use in this research.

What are some of the reasons that sunbed use is associated with a lower risk of all cause death?

Another investigation showed that sunbeds were associated with a reduced the risk of breast cancer.

In addition, research showed that sunbeds were associated with 90% higher vitamin D levels and significantly stronger bones.

Also, they are useful in treating psoriasis and other skin disorders.

Sunbeds are also useful in treating pain and in improving mood.

Finally, these devices have been shown to associate with lower clot risk.

The takeaway from all of these studies is that there is no credible research that melanoma is increased by using sunbeds. And, sunbeds have remarkably healthful effects. When receiving sun exposure or using sunbeds, be sure not to burn.

Happy sunning!

For more information, read the book, Embrace the Sun.

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MS (multiple sclerosis). Beat it with sun exposure!

MS can be prevented. By Marc Sorenson, EdD

MS (Multiple sclerosis MS) is an autoimmune disease in which T-cells initiate an inflammatory response against myelin, the protective cover of nerves.[1], [2] Hence, This process, known as demyelination, leaves the nerves bare and susceptible to “short circuiting.” MS is a debilitating, sometimes painful disease that may be fatal.

Symptoms and prevalence of MS:

Here are some of the symptoms of MS, as listed by the Mayo Clinic:

  • Numbness or weakness in one or more limbs
  • Electric-shock sensations that occur with certain neck movements
  • Tremor, lack of coordination or unsteady gait
  • Partial or complete loss of vision and
  • Problems with sexual, bowel and bladder function.

Nearly one million people are living with MS in the United States.

Salient points regarding MS and sun exposure:

It has long been known that there is an inverse association between sunlight and MS. So In other words, the greater the sunlight exposure, the lesser the risk of contracting MS. For example, it has been known for decades that those who live closer to the equator had a lower risk of multiple sclerosis (MS).[3] And in fact, the risk of MS in far northern areas is more than 100 times greater than it is in equatorial areas, where sunlight is intense, and the rate of MS approaches zero.[4], [5], [6]  Sunlight is usually much more intense at low latitudes than high latitudes.

Sunlight, MS and relapse rate.

MS also goes through periods of remission and then relapse, and of course, it is important to avoid relapse as much as possible. A sunlight and disease relationship was also noted in MS relapse rate: Each degree of latitude increase was associated with a 1% increase in the odds of having relapses over the previous year.[7] A 1% increase may not seem impressive. Yet, in a country with a 30% higher latitude, the increased risk of relapse would be 30%. And, the increased risk of disability would be 60-90%. This is exceptionally important, since MS damages the cerebral cortex of the brain. And, that damage is more severe during the relapse phase.[8]

Does sun exposure during youth confer protection against the disease?

Australian research compared the numbers of daily hours subjects spent in the sun when they were six to fifteen years of age.[9] Adults who were in the lowest “childhood sun-exposure” category were three times as likely to develop MS as those in the highest category.

What part does vitamin D play in sunlight’s protection against MS?

Most scientists conclude that vitamin D production, by sun stimulation of skin, leads to the irrefutable correlation between high sun exposure and low MS risk. On the surface, this conclusion seems entirely plausible, since summer sun exposure at midday can produce up to 20,000 international Units in 20 minutes. However, correlation does not prove causation.

Consider this: As with certain other diseases, sun exposure may have a positive influence on multiple sclerosis, independent of vitamin D production:

Researchers used animals with experimental autoimmune encephalomyelitis (EAE) (an experimental form of MS deliberately induced in animals in a laboratory setting) to determine the relative influences of UVR [sunlight] and vitamin D on the disease. They concluded, “These results suggest UVR [sun] is likely suppressing disease independent of vitamin D production, and vitamin D supplementation alone may not replace the ability of sun (UV) to reduce MS susceptibility.”[10] Later on, some of these same researchers investigated the mechanism by which sun exposure suppressed the disease and determined that UV light selectively inhibits spinal cord inflammation and demyelination.[11]Thus, it is light, not vitamin D, that protects against MS.

More on sun exposure, vitamin D and MS

Another study showed that sun exposure, while obviously being critical in the production of vitamin D, had its own profound influence in lessening the degeneration of nerves (neurodegeneration) in those with MS.[12] By measuring whole brain volume (WBV) and grey-matter volume (GMV) utilizing magnetic resonance imaging (MRI), the scientists determined that greater summer sun exposure predicted greater WBV and GMV in MS patients. Interestingly though, when 25(OH)D levels were measured, they had no influence on the positive effects of sun exposure with WBV or GMV. The researchers concluded: “Sun exposure may have direct effects on MRI measures of neurodegeneration in MS, independently of vitamin D.”  Sun exposure is known to increase the quantity of brain-derived neurotropic factor, which is essential for the protection and replenishing of nerve cells. Could it be one of the photoproducts beyond vitamin D that protects against MS? Time will tell after more research is done.

Many other studies have concluded that MS risk is reduced by sun exposure, independently of vitamin D. I would suggest that you read about that research in my book, Embrace the Sun, which is co-authored by Dr. William Grant. Also follow this link to read more about this subject: . http://sunlightinstitute.org/sun-not-vitamin-d-reduces-ms/

The most recent research on Sunlight, multiple sclerosis and vitamin D.

In 2018, research showed that living in areas of high sunlight exposure during the ages of 5-15 years, was associated with a 45-55% reduced risk of the disease. The authors of this research also noted that higher summer sun exposure in high sunlight areas was also associated with a reduced risk. So, this would indicate that we need to not only live in areas of high sun exposure to reduce MS, but also to be sure to spend plenty of time outdoors.

In 2019, other research showed that MS prevalence is strongly positively associated with increasing latitude and that the gradient is increasing, suggesting that potentially modifiable environmental factors, such as sun exposure, are still strongly associated with MS risk. The researchers also stated that “it is important to acknowledge that UVR effects need not solely be via vitamin D.” Again, this statement means to me that sun exposure always works to reduce the risk of multiple sclerosis, but it is not certain that vitamin D is the key. If it is not the key, then taking vitamin D supplements will be of no value for the disease.

The bottom line: Soak up plenty of non-burning sun, being sure not to burn. It will help to reduce the risk.


[1] Racke, M. Immunopathogenesis of multiple sclerosis. Ann Indian Acad Neurol. 2009 Oct–Dec; 12(4): 215–220.

[2] Markovic-Plese S, McFarland HF. Immunopathogenesis of the multiple sclerosis lesion. Curr Neurol Neurosci Rep 2001;1:257-62

[3] Acheson ED. Some comments on the relationship of the distribution of multiple sclerosis to latitude, solar radiation, and other variables. Acta Neurol Scand 1960;35:132-47.

[4] Alter M, Yamoor M, Harshe M. Multiple sclerosis and nutrition. Arch Neurol l974;31:267-72.

[5] Kurtkze, J. Geography in multiple sclerosis. J Neurol 1977;215:1-26.

[6] Hayes CE, Cantorna MT, DeLuca HF.Vitamin D and multiple sclerosis. Proc Soc Exp Biol Med 1997;216:21-27

[7] Jelinek GA, Marck CH, Weiland TJ, Pereira N, van der Meer DM, Hadgkiss EJ. Latitude, sun exposure and vitamin D supplementation: associations with quality of life and disease outcomes in a large international cohort of people with multiple sclerosis. BMC Neurol. 2015 Aug 5;15:132.

[8] Gracien RM, Jurcoane A, Wagner M, Reitz SC, er C, Volz S, Hof SM, Fleischer V, Droby A, Steinmetz H, Groppa S, Hattingen E, Deichmann R, Klein JC. Multimodal quantitative MRI assessment of cortical damage in relapsing-remitting multiple sclerosis. J Magn Reson Imaging. 2016  6. 10.1002.

[9] van der Mei IA, Ponsonby AL, Dwyer T, Blizzard L, Simmons R, Taylor BV, Butzkueven H, Kilpatrick T. Past exposure to sun, skin phenotype, and risk of multiple sclerosis: case-control study. BMJ 2003;327:316-321.

[10] Becklund BR, Severson KS, Vang SV, DeLuca HF. UV radiation suppresses experimental autoimmune encephalomyelitis independent of vitamin D production. Proc Natl Acad Sci U S A. 2010;107:6418-23.

[11] Wang Y, Marling SJ, Beaver EF, Severson KS, Deluca HF. UV light selectively inhibits spinal cord inflammation and demyelination in experimental autoimmune encephalomyelitis. Arch Biochem Biophys. 2015  1;567:75-82

[12] Zivadinov R, Treu CN, Weinstock-Guttman B, Turner C, Bergsland N, O’Connor K, Dwyer MG, Carl E, Ramasamy DP, Qu J, Ramanathan M. Interdependence and contributions of sun exposure and vitamin D to MRI measures in multiple sclerosis. J Neurol Neurosurg Psychiatry. 2013 Oct;84(10):1075-

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Sunlight prevents sexual dysfunction

Low breast cancer risk: Sunlight exposure or vitamin D?

Breast cancer (and other cancers) can be prevented with sunlight! By Marc Sorenson, EdD.

Breast cancer risk, much as a deadly snake, strikes fear into the hearts of women and their families. First of all, there are myriad opinions on the disease, which opinions serve mostly to confuse the issue. Yet, there is one factor emerging as something women can turn to. And that factor is regular sunlight exposure. Thus, in research performed on Black women, regarding cancer risk and vitamin D, only sun exposure cut through the confusion. This study was conducted among 1724 women with breast cancer and 1233 controls (no cancer). Various quantities of vitamin D and calcium were administered to these volunteers.

The result:

As a result, it was shown that dietary vitamin D was not associated with breast cancer risk. Supplemental vitamin D did have a small, positive effect. Yet, sun exposure (as always seems to be the case) was consistently associated with lower risk of breast cancer. Yet, the results on supplementation added to confusion. So, supplementing less than 800 IU per day of vitamin D was actually more effective than supplementing more than 800 IU. How do we explain that?

A breast cancer mistake made by health professionals and others.

While many doctors know that ultraviolet radiation (UVR) from sunlight reduces risk of cancer, they have missed something. Sunlight stimulates production of vitamin D in human skin. Therefore, many health professionals assume 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 additional 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 cancer, sunlight’s effects go beyond vitamin D. Researchers used mice that easily develop breast cancer, and treated them with UVR. [think sun exposure}
They found that UVR treatments produced significant anti-cancer effects, much as we might expect. Furthermore, they found that neither dietary vitamin D nor topical vitamin D influenced cancer risk. They stated the following because of their findings: “UVR’s inhibitory effects occur irrespective of whether or not the treatment increases circulating D3 (vitamin D) in the mice.” Also, they made one more important comment regarding their research on 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.”

And here is the transcendent research regarding sun exposure and breast cancer:

Profoundly important Iranian research has also emerged regarding breast cancer and sun exposure. Most noteworthy, the investigation showed that low vitamin D predicted only a slightly increased risk of breast cancer. Yet, there was a 10-fold increase in the risk of the disease.  In other words, there was a 1,000% increase in breast-cancer risk due to sun deficiency. among women who totally covered themselves (no sun exposure)

An important summary regarding vitamin D, sunlight and breast cancer.

Finally, there is no doubt that vitamin D, in some cases, has anticancer benefits. In addition, the aforementioned research, however, is especially relevant in that it corroborates what I said in my book, Embrace the Sun. Therefore, we must not put all the benefits of sunlight in the vitamin D box. That is because sun exposure performs miracles beyond vitamin D. And, One of those sunlight miracles is cancer prevention and inhibition.  Thus, 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 provides a cornucopia of salubrious benefits.

Embrace the sun and ease your mind about cancer. Always avoid burning.

For more information, visit sunlightinstitute.org and read the book by Sorenson and Grant: Embrace the Sun.

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Sunlight outside stops Covid-19.

Lymph cancers and sun exposure. Better than vitamin D

Marc Sorenson, EdD, Author of Embrace the Sun

Lymph cancers and sun exposure:

Research published  in the journal Blood, demonstrated remarkable risk reduction (due to sun exposure), of cancers known as lymphoid malignancies. These are cancers of the lymph system or lymph cancers. And, they include non-Hodgkin’s Lymphoma, multiple myeloma and  classical Hodgkin’s Lymphoma. All of them can be deadly. This is vital information, and I have previously written about the effect of sunlight and its protective effect on children’s’ lymph cancers. http://sunlightinstitute.org/sunlight-helps-children-to-reduce-the-risk-of-non-hodgkin-lymphoma/

 First of all, the researchers measured exposure to the sun among residents  in different geographic areas. Then they compared the different categories of exposures to the risk of contracting these cancers.

What were the results regarding sun exposure and lymph cancers?

As a result, it was shown that those residents living in the areas with the highest quartile (fourth) of sun exposure were impressively protected against lymph cancers. That is, when compared with those in the lowest quartile. So the overall reduction in risk was 43% reduced risk of Non-Hodgkin’s lymphoma. In addition, they had a 64% decrease in the risk of one of its subcategories, known as diffuse large B-cell lymphoma. Furthermore, the risk of another subcategory of lymph cancers, chronic lymphocytic leukemia, was reduced by 54%. Multiple myeloma was also associated with a reduced risk of 43% among those in the highest quartile of sun exposure.

Especially relevant was the fact that dietary vitamin D was not associated with the risk of lymph cancers.

The researchers stated, “These results support a protective effect of routine residential [sun exposure] against lymphomagenesis [lymph cancer production] through mechanisms possibly independent of vitamin D.”

What is the salient finding of this lymph cancer research and other sunlight/vitamin D/cancer research?

Most noteworthy, in perusing the research of sunlight and disease, I noted that vitamin D was effective for some diseases. Yet, I also noted it was only minimally effective, or ineffective, for others like lymph cancer. Also, it became obvious that exposure to the sun or other sources (sunlamps) was usually profoundly effective.

So should sunlight research on lymph cancer and other cancers focus on vitamin D?

So rather than focus on vitamin D as the only photoproduct of sun exposure, the authors should have examined the big picture. In other words, the holistic sun. Thus, many of these studies should have mentioned the effect of sun exposure on vasodilation, mediated by the skin’s production of nitric oxide. Also, they could have discussed the influence of sun exposure on the production of beneficial serotonin, dopamine, BDNF and endorphin. Vitamin D is an exceptionally important photoproduct of sun exposure, but it is not the only photoproduct. Thus, I predict that a new field of research, regarding other photoproducts of sun exposure, will soon emerge. And, it will provide impressive new knowledge regarding the life-and-health-giving benefits of our most precious friend, the sun.

The takeaway for sunlight and lymph cancer:

In conclusion, these findings are doubly important. They indicate sun exposure has protective effects against lymph cancers independent of vitamin D. This is also true of other cancers we have discussed or will discuss in other blogs. It is probably also true that vitamin D produced through sun exposure is superior to that obtained through food or supplements.  Thus, it appears that “Mother Nature knows best.” It seems like the sun’s rays, one of God’s greatest gifts, should not be ignored as powerful therapeutic and preventive therapy.

Read this book:

For more information on the influence of sunlight on lymph cancer, and other destructive diseases, read the book Embrace the Sun, by Sorenson and Grant.

https://www.amazon.com/Embrace-Sun-Marc-B-Sorenson/dp/069207600X

Happy sunning, and do not burn.

Marc Sorenson.

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Sunlight or vitamin D or both? Sunlight is the answer.

Sunlight or vitamin D or both? By Marc Sorenson, EdD.

Sunlight or vitamin D? That is a question that should not be necessary, yet many believe that vitamin D replaces sun exposure. So, they will state, “just take some vitamin D pills rather than go out in the sunlight, thus, you can derive sunlight benefits without the risk of skin cancer.” This opinion is incorrect, and it leads to sun deprivation.

This poor opinion of sunlight is misguided, erroneous and dangerous.

First of all, sunlight leads to production of many photoproducts when it touches the skin or enters the eyes. (Do not stare into the sun, since sufficient sun enters the eyes by reflection from objects or from the sky). These photoproducts include serotonin, endorphin, vitamin D, dopamine, brain-derived neurotropic factor (BDNF) and nitric oxide.

Furthermore, all of these sunlight photoproducts are known to have healthful effects.

In addition, there are more photoproducts that are produced by sun exposure, but they have not yet been well-studied. Yet, it is likely that all of them will be found to have salubrious effects for the human body. Hence, we need them all. Obviously, a vitamin D pill cannot provide all the health benefits that sunlight provides.

Vitamin D in isolation may not always be healthful. Consider sunlight instead.

So yes, vitamin D is an important photoproduct of sunlight, but it is just one of the photoproducts. Thus, it is along for the ride with its companions. The serum blood tests which measure vitamin D are really surrogate measures for sunlight exposure and its other photoproducts. And, these photoproducts work as a team; one might say a “holistic” team.

Sunlight or vitamin D. What does the vitamin D research tell us?

A surprising piece of recent research assessed the efficacy of vitamin D supplementation on bone strength and density. The researchers worked with 311 healthy volunteers aged 55 to 70 and these volunteers were split into three groups. One group received 400 international units (IU) per day of vitamin D, and a second group received 4,000 IU per day. Finally, a third group received 10,000 IU per day. Bone strength and density were measured at the beginning of the investigation and at intervals of 6, 12, 24 and 36 months. The researchers had thought there would be an increase in bone mass, yet, the results were opposite of their expectations. Stunningly, all three groups lost bone mass, and the higher the vitamin D dose, the more rapid the bone loss!

How can this happen? Does sunlight exposure play a part?

So, we have an interesting dichotomy here. First of all, we see that isolated vitamin D (the supplements) were counterproductive for bone strength and mass. And yet, we know that low serum levels of vitamin D are associated with low bone density. Maybe we can unravel this mystery by mentioning that almost all serum vitamin D (about 90%) is produced by sun exposure on the skin.

Therefore, low vitamin D levels are really indicative of sunlight deprivation.

And as aforementioned, one isolated chemical (vitamin D), cannot possibly be expected to take the place of the holistic sun. Especially relevant is a study that found Spanish women who sunbathed had 1/11 the fracture risk of indoor women. Is there any doubt that the strong-boned women had higher vitamin D levels than their counterparts? You see, we have gotten it backward, because greater sun exposure associates with higher vitamin D levels and predicts long life and health. Sunlight leads to vitamin D production, but vitamin D does not bring sunlight and all its additional photoproducts.

Does vitamin D supplementation protect against cardiovascular disease (CVD), or is it sunlight?

We know the answer to half of that that question due to a study of more than 83,000 people. And this study was a meta-analysis. This means a compilation and analysis of the best supplementation studies. The study compared vitamin D intake with CVD events (heart attacks, stoke, death from CVD and all-cause death). The authors found, as a result, that vitamin D supplementation was not associated with CVD.

Most noteworthy is that for years, sunlight was shown to associate to a much reduced risk of CVD.

And, that included heart attack and stroke.
Many made the mistake of giving the credit for the reduced risk to vitamin D, because of this research.The answer to health is to embrace the holistic sun and not a single photoproduct.

Sunlight related to the beta carotene study

This reminds me of research on beta-carotene, an antioxidant nutrient found in orange and yellow vegetables such as carrots. Since these vegetables have healthful properties, the researchers decided to experiment with isolated beta-carotene. They wanted determine if beta-carotene also had anti-cancer properties. To their dismay, these experiments associated to an increase in cancer. Does isolated vitamin D lead to the same deleterious outcomes? Sunlight should also be used in its whole form, just like the carrot.

So in the winter, in climes where there is little sunlight, how do we get our share of life-saving light?

The best method is to use a good sunbed (tanning bed), and when the sunlight is available, to be outside enjoying it, summer and winter. Sunbed use has many life-enhancing effects, including longer life, stronger bones and better mood. Read more about sunbeds, sunlight, bone strength and health at http://sunlightinstitute.org/ and read the book by Sorenson and Grant: Embrace the Sun.

Happy sunning! And remember never to burn.

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Light exposure for the gut. Soak it up for health!


Light exposure for the gut, by Marc Sorenson, EdD L

Light exposure for the gut seems like a strange concept. And, rest assured we will not discuss shining light directly into the gut to optimize health. However, light exposure, according to new research, may assist in gut homeostasis and may positively alter the gut microbiome.

The thinker, worrying about light exposure to his gut.

Some words you should know to better understand light exposure for the gut:

Circadian rhythms: Circadian rhythms are variations in physiology and behavior persisting with a cycle length close to, but not exactly, 24 hours. It is necessary to synchronize the rhythms on a regular basis to maintain them. And, such synchronization is usually achieved through regular exposure to light and darkness.

Entrainment: Entrainment occurs when rhythmic physiological or behavioral events are matched to an external environmental factor. So it is ultimately the interaction between circadian rhythms and the environment, especially sunlight or darkness.

Homeostasis: The maintenance of metabolic equilibrium and balance within an animal by a tendency to compensate for disrupting changes. Thus, homeostasis is vital for good health. And conversely, a lack of homeostasis in the gut is a disease state.

Microbiome, or microbiota: A collection of microorganisms living in or on the human body. For the purposes of this discussion, we are interested in those microorganisms, such as bacteria, inhabiting the gut.

UVB: Ultraviolet B light, a part of the solar spectrum, which is also used in experiments by way of sun lamps.

Circadian rhythms: Circadian rhythms are variations in physiology and behavior persisting with a cycle length close to, but not exactly, 24 hours. It is necessary to synchronize the rhythms on a regular basis to maintain them. And, such synchronization is usually achieved through regular exposure to light and darkness.

Entrainment: Entrainment occurs when rhythmic physiological or behavioral events are matched to an external environmental factor. So it is ultimately the interaction between circadian rhythms and the environment, especially sunlight or darkness.

Homeostasis: The maintenance of metabolic equilibrium and balance within an animal by a tendency to compensate for disrupting changes. Thus, homeostasis is vital for good health. And conversely, a lack of homeostasis in the gut is a disease state.

Microbiome, or microbiota: A collection of microorganisms living in or on the human body. For the purposes of this discussion, we are interested in those microorganisms, such as bacteria, inhabiting the gut.

UVB: Ultraviolet B light, a part of the solar spectrum, which is also used in experiments by way of sun lamps.

First of all, let’s discuss the effect of light exposure on gut homeostasis.

There are specialized cells in the body called ILC3s, which are major regulators of inflammation, infection, microbiota composition and metabolism in the gut.

These cells do not function well if they are not synchronized to the biological clock (or circadian rhythm). So, the most effective way to assure that these cells are working is through external light exposure, particularly sunlight. Light signals are the major entraining cues of ILC3s.

In fact, as a result of the removal of circadian regulators in intestines, the researchers showed that many problems occur. Without regulators, light exposure can’t do its job, and therefore the circadian rhythms of the gut would be extinguished. Why? Because ILC3s could not connect to those regulators in the gut. Thus, this caused disrupted homeostasis, impaired epithelium, a deregulated microbiome, increased infection and disrupted lipid metabolism. The researchers stated that “Our work reveals a circadian circuitry that translates environmental light cues into enteric [intestinal] ILC3s, shaping intestinal health, metabolism and organismal homeostasis.” So the bottom line is, for gut health, get your sun exposure daily!

[intestinal]

Secondly, another investigation provides more information regarding light exposure and the gut microbiome.

Light exposure, vitamin D and microbiome makeup are all associated with inflammatory conditions like multiple sclerosis and inflammatory bowel disease. Therefore, scientists hypothesized that a causal chain links the three. So to test the hypothesis, they used female volunteers in a scientific experiment. In addition to three one-minute sessions of full-body UVB exposures, the volunteers had their blood vitamin D levels tested. Furthermore, before and after treatment, stool samples were taken for analysis of volunteers’ gut microbiomes.

The results regarding UVB light exposure and gut microbiome.

As a result of this minuscule UVB light exposure, good bacteria increased in the microbiome, as did vitamin D. Another fact mentioned in the paper was that studies in rodents indicated UVB increased good bacteria while decreasing harmful bacteria. So does this prove vitamin D could be responsible for lessening risk of multiple sclerosis (MS) and inflammatory bowel disease? No. It is especially relevant that many studies on vitamin D supplementation and MS show no effect. The one consistent outcome of the studies is that sun exposure always lessens the risk of MS. Sun exposure produces the marvelous hormone, vitamin D, but it also produces serotonin, endorphin, nitric oxide, BDNF and dopamine. In addition, there are many more photoproducts produced by sun exposure, which have not been fully studied for health benefits.

When possible, use sun exposure or other UVB light exposure to produce your vitamin D.

Therefore, vitamin D levels are, in many cases, surrogate measurements for sun exposure. The health benefits attributed to vitamin D may be due to other factors also being produced by sun exposure. The sun should be used holistically when possible. Using only one photoproduct of sun exposure seems like a mistake. Thus, it is much like extracting a single plant vitamin. That vitamin doesn’t have the health benefits of the entire plant, because it lacks fiber and other nutrients. Therefore, the closest thing to holistic sun is the use of a sunlamp or a sunbed. For more information, visit the sunlight Institute website.

In conclusion, take care of your gut and your health through non-burning, regular sun exposure.

For more information on sun exposure and MS, read the book, Embrace the Sun. Read more on circadian rhythms on http://sunlightinstitute.org/

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Alzheimer’sBDNFblood pressurebonebreast cancercancercircadian rhythmdeathdepressiondiabetesendorphinhealthheart diseaseinflammationkidsmelanomametabolic syndromemoodMSmultiple sclerosismyopianitric oxideobesityosteoporosispregnancyprostate cancerpsoriasisserotoninskin cancerStrokesummersunsunburnsun exposuresunlightSunlight exposuresunscreensunshinetanning bedsUVUVAUVBUVRvitamin dvitamin D deficiency