Sun Protection
Dr. Richard Maurer
www.CoastalNaturalHealth.com
According to the American Academy of Dermatology (AAD), more than one million new cases of skin cancer will be diagnosed in the United States this year – this includes melanoma, the deadliest form of skin cancer.
Protection, however, requires more than globbing sunscreens or sunblocks onto skin. We all know that using sunscreen dramatically reduces the incidence of sunburns – BUT, the reduction in future skin cancer is far from dramatic. "Sunscreens don't prevent skin cancer, they can only reduce the risk." according to Mark Chamberlain, PharmD at the University of Maryland School of Pharmacy. Dr. Chamberlain offers this example: If time spent in the sun remains the same, a person with a 50 percent chance of developing skin cancer will reduce his risk to only 20 percent with daily use of sunscreen. Two forms of solar radiation are of concern: Ultraviolet-A (UVA) which are long-wave solar rays that are less likely to cause sunburn, but penetrate the skin more deeply; and ultraviolet-B, short-wave solar rays responsible for sunburns and considered the leading cause of basal and squamous cell skin cancer, as well as a significant contributor to melanoma. There is increasing evidence of UVA causing photoaging and UVA is believed to exacerbate UVB's carcinogenic effects, contributing to cancers, especially melanoma. Dr. John Knowland of Oxford University explains that in using sunscreens that absorb UVB but not UVA, "you can encourage prolonged exposure, thereby getting a much higher dose of UVA, and perhaps increasing the risk of melanoma."
Avoiding the sun between 10 a.m. and 4 p.m., when the rays are most powerful, is the best option for protection against UV rays, dermatologists say. But when this is not practical, one should use sunblock creams and wear protective clothing. Below are some recommendations for how to pick the most effective of both.
Ingredients to Avoid
Overall, there are two basic types of skin cream or lotion protection: sunscreens, which absorb and deflect (or reflect) the sun's rays via a chemical reaction, and "blocks"—zinc oxide and titanium dioxide—which create a physical barrier against rays. Sunblocks are the best for many reasons. But let’s at least start by avoiding the following ingredients:
• PABA: Though rarely used now in sunscreens, beware of products that contain the ingredient. Forty percent of the population is sensitive to it, experiencing red, itchy skin.
• Benzophenone (benzophenone-3), homosalate, and octy-methoxycinnamate (octinoxate): These chemicals are of more concern because they have shown estrogenic activity in lab tests. Dr. Margret Schlumpf of the University of Zurich's Institute of Pharmacology and Toxicology says they have been shown to disrupt hormones, affecting the development of the brain (particularly the hypothalamo-pituitary-gonadal system) and reproductive organs in laboratory rats.
Because people are exposed simply by eating fish (where benzophenone accumulates in the fat), using sunscreen containing these chemicals unduly increases the exposure. Based on her studies, Dr. Schlumpf advises people avoid products containing benzophenone and the related chemicals above.
• Parabens (butyl-, ethyl-, methyl-, and propyl-): Parabens may also mimic estrogen, but because they are common in sunscreens, avoiding them may prove difficult.
• Padimate-O and Parsol 1789 (2-ethylhexyl-4-dimethylaminobenzoic acid and avobenzone): These two chemicals have the potential to damage DNA when illuminated with sunlight. On the skin's surface, these chemicals do protect from UV damage; however, once absorbed into the skin, these same chemicals can prove destructive. Dr. Knowland's research indicates that Padimate-O and Parsol 1789 "are excited by the UV energy which they absorb and become reactive, acquiring the potential to attack cellular components, including DNA." Knowland cautions that "DNA damage inflicted by an excited sunscreen is much less capable of being repaired by naturally occurring repair mechanisms than the DNA damage inflicted by UV alone."
• Although insect repellents with sunscreen may seem like an easy option, Dr. Best recommends avoiding them because of the dangers of overexposure to DEET, which can cause eye and skin irritations, headaches, nausea, when the product is reapplied after swimming or exercise.
Choose Sun Blocks
Zinc oxide, which lies on the skin without being absorbed, is completely safe. Unfortunately, its most common form is lifeguard white which can make it an unattractive choice. Dr. Kazutaka Hirakawa of Shizuoka University has shown that when injected into tumor cells to test its usefulness in fighting cancer, titanium dioxide (TiO2) has shown phototoxicity (or the capability to damage skin upon exposure to light), but as a sunscreen appears to be safe, based on what is known so far. Dr. Hirakawa explains that "titanium dioxide itself is an effective sunscreen and does not show phototoxicity in a normal condition as a sunscreen. A protective action of TiO2 for UV light may be much greater than its phototoxic effect on human skin." Most titanium dioxide used in sunscreens is coated with materials that reduce its photoactivity. Dr. Knowland says that according to current evidence titanium dioxide is much less likely than other chemical sunscreens to penetrate human skin. Note that on sunscreen labels companies rarely distinguish between sunscreens and sunblock, and instead use the term "sunscreen" for both. Look for zinc oxide or titanium dioxide as the active ingredient when choosing.
Protective Clothing
The right clothing can protect against the sun's harmful rays. Sunglasses and wide-brimmed hats are obvious choices, but it is equally important to consider the rest of your clothing. Consider these factors when choosing appropriate clothing (most important factors are listed first): weave (tighter is best), color (darker fabrics let less light through than lighter), weight (the heavier, the better) and stretch (stretch clothing loses UV protection as the item stretches out). If this has you imagining yourself in a black wool sweater in the middle of an August heat wave, fear not. You'll be well-protected wearing unbleached cotton or high-luster polyester or satiny silk, which reflect radiation. You can also consider investing in ultraviolet protection factor (UPF) clothing.
Proper Use of Sunscreen & When to Use It
Remember some sunlight is necessary for proper Vitamin D metabolism and skin health. Vitamin D is a unique vitamin associated with protection from osteoporosis and a reduced risk of breast, prostrate, and colon cancers. Studies have also linked vitamin D with mood improvement, endorphin release and libido function. If you are only going to be out in the morning or after 4 or 5 PM in the summer, this UV exposure is healthy, so do not use sunblock at this time.
But when the sun is strongest – look for shade and wear cool comfortable long clothing and a brimmed hat. Then go for the sunscreen in the target areas. If you are on or near the water or snow, the UV is coming from all directions due to reflection. So take extra precautions in these circumstances.
Products
Not as easy as it looks. As Zinc is really the best of the blocks we have found and the white film in ghastly to some. ZinClear is the best active ingredient to date. Look for sunblock for a company called MyChelle.
207-781-4447