Sun Exposure & Sunscreen: The Real Risks

Sunscreen products can contain ingredients that may trigger allergic reactions, disrupt hormones in the body, and damage DNA. Damaged DNA doesn’t always cause cancer, but does increase the risk of developing cancer. Additives to avoid include sulisobenzone, ensulizole, octocrylene, octinoxate, methoxycinn-amate, octyl methoxycinnamate, hemosalate, PABA and PABA esters, Padimate O, 4-methylbenzylidene camphor, 3-benzylidene camphor, and benzophenone-2, -3, and -4.

Concerns have also been raised about nanoparticles which may be added to sunscreen products that use minerals like zinc oxide and titanium dioxide to protect skin from damaging UVA and UVB radiation. These ingredients give sunscreens a white color, which can give skin a white color too. To minimize this effect, zinc oxide and titanium dioxide may be used in the form of nanoparticles, which are so small, they’re measured in nanometers. (It takes a billion nanometers to make a meter.) Their smaller size makes them invisible, so the sunscreens become invisible too.

While sunscreen products can prevent sunburn, they can’t prevent skin damage from sun exposure and in most cases, they don’t prevent cancer. Studies show that regular use of sunscreen can reduce the risk of one type of skin cancer, squamous-cell carcinoma, but it doesn’t reduce the risk of the most common type, basal-cell carcinoma, or the most deadly type, malignant melanoma.

Because people who wear sunscreen are less likely to become sunburn, they are more likely to spend prolonged periods of time in the sun. More time in the sun means more cancer risk, so using sunscreen can indirectly increase risk of developing cancer, regardless of any potentially toxic additives.

If you don’t spend enough time in the sun, or if you wear too much sunscreen, your skin doesn’t make enough vitamin D. Low levels of vitamin D are a risk factor for developing cancer. A Chinese study found that people who had more exposure to sunshine were less likely to die from cancer and suggested that higher levels of vitamin D played an important role in prevention. Sun exposure not only reduced rates of skin cancer, it was also associated with lower rates of most major cancers including those of the lung, breast, bladder, esophagus, stomach, liver, colon, and rectum.

Some sun exposure is just as important for good health as fresh air and clean water. Follow these five tips to sunbathe safely, get your vitamin D, and minimize your risk of cancer at the same time:

#1 Check the UV index and spend time outside when the sun’s rays are least intense.

The UV index is a scale from 1 to 11 that estimates the risk of harm that the sun’s rays can have on unprotected skin:

1 and 2 = low risk

3, 4, 5 = moderate risk

6 and 7 = high risk

8, 9, 10 = very high risk

11 = extremely high risk

The UV index is highest in the summer and in the middle of the day. It’s lowest in the winter and during early morning and late afternoon hours. When the UV index is low, it’s safe to be outside without using sunscreen. When the UV index is moderate, wear sunscreen outdoors. When the UV index is high, stay out of the sun. If you can’t seek shade, cover your skin with long sleeves, long pants, and a hat.

#2 Choose non-toxic sunscreens with a sun protection factor (SPF) between 15 and 50 that block both UVA and UVB light.

Use the Environmental Working Group’s Sunscreen Guide (http://www.ewg.org/2012sunscreen/) to find products free of harmful additives. Also opt for creams and lotions over sprays and powders, which can be accidentally inhaled and absorbed directly into the bloodstream. I don’t recommend sunscreens with SPF higher than 50 because they can convey a false sense of security, enticing users to stay longer in the sun.

#3 Apply sunscreen liberally.

Use two to three tablespoons of sunscreen lotion every two hours and apply it everywhere including your hands, feet, and ears. Use lip balm with SPF protection as well.

#4 Be extra cautious at high altitudes and around water, snow, ice, and glass.

UV radiation increases with elevation, penetrates glass and water, and is reflected from glass, water and sand, which magnify its intensity. Be extra cautious when sitting on the beach, swimming and ice skating outdoors, participating in snow sports, spending time at high altitudes, and sitting next to windows inside planes, trains, and automobiles.

#5 Consume plenty of colorful, antioxidant-rich foods including berries, tomatoes, cruciferous vegetables, and green tea (hot or iced).

Studies show that certain compounds found in fruits, vegetables, green tea, and herbs like rosemary can protect skin against damage from the sun’s ultraviolet radiation without interfering with vitamin D production. These foods have anti-inflammatory and antioxidant effects in the skin which minimize damage associated with aging and modulate the immune system, helping to prevent cancerous changes. If you don’t eat them regularly already, start now.