November 16, 2014 | 136,511 views
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Click HERE to watch the full interview!
By Dr. Mercola
The US Surgeon General recently came out with a warning on skin cancer,1 claiming that the sun is dangerous and that you need to stay away out of it.
Dr. John Cannell, founder of the Vitamin D Council, has dedicated a large part of his professional career to the study of vitamin D and its health benefits, and he has a warning of his own to those who take this narrow-minded advice to heart.
It’s worth noting that the acting Surgeon General, Boris Lushniak, is a dermatologist. And of all the medical specialties out there, dermatologists are clearly the most biased against sun exposure, and as a result, against vitamin D.
This isn’t surprising, since they primarily see the ill effects of sun overexposure. But in taking an overly narrow view, the advice to avoid sun exposure as much as possible can have equally if not greater adverse health effects.
The Connection Between Sun Exposure and Skin Cancer
Unquestionably, UV radiation can be dangerous; it can increase your risk for certain skin cancers such as squamous cell, basal cell, and melanoma. But there are significant differences even between these cancers, and appropriate sun exposure may actually be more beneficial than detrimental in some cases. Dr. Cannell explains:
“Squamous cell carcinoma is clearly associated with chronic sun exposure. It is more common on the face, the hands, and the scalp.
It is related to radiation burden over your lifetime, and together with basal cell carcinoma, which is sort of intermediate, it accounts for approximately 1,500 deaths a year in the United States...
Basal cell is sort of intermediate. There are studies showing that it is associated with chronic sun exposure, and there are studies showing that it’s not associated with chronic sun exposure.
And then there’s melanoma, which is responsible for almost 9,000 deaths a year and is the deadly skin cancer that is feared. The relationship that melanoma has with the sun is quite complicated.
It is clearly associated with sunburn, especially sunburns when you’re young (that’s incontrovertible) or sunburns in a sun tanning bed.”
However, there are at least two studies showing that melanoma is more common in indoor workers than outdoor workers. And the most likely places for melanoma to appear are actually NOT the face and the hands like squamous cell carcinoma, but rather the lower back and the upper leg—areas that are usually not chronically sun-exposed.
According to Dr. Cannell, there’s a vocal minority in the dermatological community that thinks the emphasis dermatologists have on avoiding sun exposure is wrong, because while sunburn is a risk factor, chronic sun exposure is not.
“A number of studies show that chronic sun exposure is related to melanoma, but they don’t separate out the sunburns, which is very hard to do because you have to do that by memory,” Dr. Cannell says.
Two Decades-Long Study Finds Sun Avoidance Doubles Risk of Death
Dr. Cannell notes a recent study2 done in Sweden, which followed nearly 30,000 middle-aged to older women for up to 20 years. The average follow-up was 15 years.
At the outset, they asked a number of questions about sun exposure, such as: Do you sunbathe? Do you take vacations in sunny areas in the winter? Do you garden with short sleeves and shorts? And, do you use sunbeds?
What they found, and this appears to be the only study of this kind, is that the women who avoided the sun were twice as likely to die over the course of the study. The researchers attributed this finding to a vitamin D mechanism.
What this study actually shows is that chronic sun exposure appears to be associated with less mortality. It’s also the first study to show that women who use tanning beds live longer than those who don’t.
This is in direct conflict to what almost every dermatologist will say, including the Surgeon General. It’s unfortunate, but the danger of almost any specialist is that they don’t take the broader perspective.
What the Surgeon General and almost every other dermatologist fail to take into account is the overall mortality, which is referenced in this recent study.
Risk-Benefit Analysis
In addition to this study, dozens of others document the benefits of appropriate sun exposure. This includes a reduced risk of about 16 different cancers of Dr. Garland’s studies suggest this reduction is close to 50 percent.
So many hundreds of thousands of people are put at risk from other cancers as opposed to 10,000 people who are dying from skin cancer caused by sunburn. It’s really a matter of making an educated risk-benefit analysis.
“When you do a risk-benefit analysis and you look at all the data we have, the risk in my opinion appears to be in those who avoid the sun,” Dr. Cannell says.
“Now, if you avoid the sun, your risk for non-melanoma skin cancer goes down. That’s clear. But if you look at studies of either latitude or of 25-hydroxyvitamin D levels in relation to cancer, you find this inverse relationship: the higher the vitamin D level, the lower the internal cancer rate.”
Dr. William Grant of Sunlight, Nutrition, and Health Research Center (SUNARC) estimates that if everyone in the United States had a vitamin D level of 40 nanograms per milliliter (ng/ml), it would save approximately 150,000 lives a year.3
That’s 100 times the rate of squamous cell cancers, which are the only ones that are definitively linked to UV exposure. In Canada alone, it is estimated that 37,000 lives a year are lost due to vitamin D deficiency.4 Also, use of sunscreen has risen in the last 30 years, so if dermatologists were correct, there should be a decrease in stage 1 melanoma. But there’s not. As sunscreen use increased, stage 1 melanoma diagnosis increased...
“It’s thought that by blocking out UVB, patients are able to stay out in the sun longer than they would have otherwise and expose themselves to the more dangerous, or at least potentially dangerous, UVA radiation that’s in the sunshine,” Dr. Cannell says. “What we recommend is what’s called safe, sensible sun exposures. The Australian Cancer Council now recommends the same thing. I think in England there’s now a change in their recommendation from strict sun avoidance to some safe, sensible sun exposure. There are some movements in large organizations to realize that safe, sensible sun exposure is a healthy thing.”
How Much Sun Exposure Is Sensible?
On its website, Cancer Research UK reports that “by enjoying the sun safely and avoiding sunburn, people can reduce their risk of skin cancer and enjoy the beneficial effects of the sun.” Cancer Research UK’s sun advice is endorsed by the British Association of Dermatologists, Cancer Research UK, Diabetes UK, the Multiple Sclerosis Society, the National Heart Forum, the National Osteoporosis Society, and the Primary Care Dermatology Society. The UK National Health Service5 also recommends sensible, individualized sun exposure to help optimize vitamin D.
It’s important to recognize is how quickly sunlight can make vitamin D in the skin. You don’t need to be outside for hours on end. But you do need more than just a few minutes of sun on your face and arms. According to Dr. Cannell, sunbathing at solar noon in the summer, at most latitudes in the United States you will make between 5,000-10,000 international units (IUs) of vitamin D within 30 minutes.
“You can ask yourself why nature would evolve a mechanism that made so much vitamin D so quickly,” Dr. Cannell says. “When I thought about that question, the only answer I could come up with is nature did it for a good reason. The organism needs vitamin D, so the system in the skin evolved to make it very quickly upon exposure to sunlight.
We recommend full-body sun exposure for up to anywhere from a few minutes to 30 minutes every day. On those days when you cannot get a full-body sun exposure, we recommend a vitamin D supplement or sensible exposure in a low-pressure UVB bed.”
If you’re getting regular sun exposure, I think the need for an oral supplement is really minimal to non-existent. When you swallow a pill, there’s no self-regulating ability. Your body doesn’t have an ability to selectively limit its absorption. But your skin has the ability to control how much vitamin D is being produced based on how much is in your blood.
I personally have not taken oral vitamin D for five years and my level runs from 50-70 g/ml. Lifeguards, roofers, and gardeners who work with their shirt off, all tend to have levels between 40 and 80 ng/ml in the summer. This also brings up an interesting question about the difference between normal and natural. Normal vitamin D levels are an average of what indoor workers have in both winter and summer. Natural are levels of a population with widespread sun exposure. The latter is going to be closer to ideal, or optimal.
There are also other reasons to strive for sun exposure rather than swallowing a pill. As noted by Dr. Cannell, aside from producing vitamin D, sunlight also affects nitric acid levels and endorphins in the skin. Researchers at the University of Wisconsin recently discovered that there may be a system at 311 nanometers that is separate from the vitamin D system (which is at 298 nanometers), and that there may be an entirely new undiscovered biochemical system in the skin that makes yet another substance, besides vitamin D. Time will tell what comes out of that research, but there are indications that sunlight may be responsible for other biological processes that are unrelated to vitamin D production.
Dr. Cannell’s Recommendation on Tanning Beds
There are basically two types of tanning beds:
- High-pressure UVA beds. They tan you the quickest because it’s UVA that tans the skin. They contain only a limited UVB spectrum, and will therefore give you color but not much vitamin D
- Low-pressure beds, which contain less UVB than sunlight at most latitudes, but still contain a significant amount of UVB. These are the beds Dr. Cannell recommends, provided you’re using a sensible approach that avoids sunburns. It’s important to realize that you can easily get burned after only a couple or a few minutes when using a tanning bed
Another important factor when selecting a tanning bed is the type of ballast it employs, to avoid excessive electromagnetic field (EMF) exposure. Most tanning units use magnetic ballasts to generate light. These magnetic ballasts are well known sources of EMF fields that can contribute to cancer. If you hear a loud buzzing noise while in a tanning bed, it has a magnetic ballast system. I strongly recommend you avoid magnetic ballast beds, and restrict your use of tanning beds to those that use electronic ballasts.
On days you cannot get either regular sun exposure or use of a tanning bed, Dr. Cannell suggests taking 5,000 IUs of vitamin D3. Other vitamin D experts recommend similar amounts. It’s worth noting that, according to the federal government’s Food and Nutrition Board (FNB), the no observed adverse effects level (NOAEL) of vitamin D is 10,000 IUs a day. This means there has never been a replicated reliable study showing that 10,000 units a day is in any way detrimental.
Many individuals who have reported side effects from taking high doses of oral vitamin D have noticed that when they supplemented with magnesium, they were able to tolerate the high oral doses of vitamin D. Dr. Carolyn Dean has written in her book, The Magnesium Miracle, that she has seen this so many times that she doesn’t advise taking more than 2,000 units of vitamin D without magnesium supplementation. Be sure to also have an adequate amount of vitamin K2 along with D to slow the progression of arterial calcification. Remember though that the best form of vitamin D is the one your body produces when it is exposed to sunlight that has sufficient amounts of UVB.
Five Tips to Get an Appropriate, Sensible Amount of Sun
Again, sunshine offers substantial health benefits, including vitamin D production, but you do need to exercise a few simple precautions to protect yourself from overexposure. Virtually all of the harm from sun exposure is related to sunburn. Here are my top five tanning tips:
- Expose large amounts of your skin (at least 40 percent of your body) to sunlight for short periods daily. Optimizing your vitamin D levels may reduce your risk of as many as 16 different types of cancer, including pancreatic, lung, ovarian, breast, prostate, and skin cancers. If using a sunscreen, give your body a chance to produce vitamin D before you apply it.
- Stay out just long enough for your skin to turn the very lightest shade of pink, if you’re naturally light-skinned, or just a hint reddish if you’re dark-skinned. Shield your face from the sun using a safe sunscreen or hat, as your facial skin is thin and more prone to sun damage, such as premature wrinkling.
- When you'll be in the sun for longer periods, cover up with clothing, a hat, or shade (either natural or shade you create using an umbrella).
- Consider the use of an "internal sunscreen" like astaxanthin to gain additional sun protection. Astaxanthin is a potent antioxidant (and pigment) produced by marine algae in response to their exposure to UV light. Typically, it takes several weeks of daily supplementation to saturate your body’s tissues enough to provide protection.
- Consuming a healthy diet full of natural antioxidants is another useful strategy to help avoid sun damage. Fresh, raw, unprocessed vegetables and fruits deliver the nutrients that your body needs to maintain a healthy balance of omega-6 and omega-3 oils in your skin, which is your first line of defense against sunburn. Vegetables also provide your body with an abundance of powerful antioxidants that will help you fight the free radicals caused by sun damage that can lead to burns and cancer.
How Vitamin D Performance Testing Can Help Optimize Your Health
A robust and growing body of research clearly shows that vitamin D is absolutely critical for good health and disease prevention. Vitamin D affects your DNA through vitamin D receptors (VDRs), which bind to specific locations of the human genome. Scientists have identified nearly 3,000 genes that are influenced by vitamin D levels, and vitamin D receptors have been found throughout the human body.
Is it any wonder then that no matter what disease or condition is investigated, vitamin D appears to play a crucial role? This is why I am so excited about the D*Action Project by GrassrootsHealth. It is showing how you can take action today on known science with a consensus of experts without waiting for institutional lethargy. It has shown how by combining the science of measurement (of vitamin D levels) with the personal choice of taking action and, the value of education about individual measures that one can truly be in charge of their own health.
In order to spread this health movement to more communities, the project needs your involvement. This was an ongoing campaign during the month of February, and will become an annual event.
To participate, simply purchase the D*Action Measurement Kit and follow the registration instructions included. (Please note that 100 percent of the proceeds from the kits go to fund the research project. I do not charge a single dime as a distributor of the test kits.)
As a participant, you agree to test your vitamin D levels twice a year during a five-year study, and share your health status to demonstrate the public health impact of this nutrient. There is a $65 fee every six months for your sponsorship of this research project, which includes a test kit to be used at home, and electronic reports on your ongoing progress. You will get a follow up email every six months reminding you "it's time for your next test and health survey."
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