Position Statement The Risks and Benefits of Sun Exposure
Positive and negative effects of UV
Earth's atmosphere blocks 98.7% of UV rays enter the atmosphere. 2.3% received both positive and negative.
The positive effects (beneficial) UV
Triggers vitamin D - UV sunlight is necessary for our body to produce vitamin D. Vitamin D helps strengthen bones, muscles and immune system of the body. You can also reduce the risk of certain cancers, including colon cancer.
It helps certain skin conditions - UV is used to treat skin diseases such as psoriasis. This is a condition in which the skin cells lose too fast itchy, scaly patches develop. UV exposure to reduce the growth of skin cells and relieves symptoms.
Help moods - Research suggests that sunlight stimulates the pineal gland in the brain to produce certain chemicals called "Tryptamines These chemicals improve our mood..
Helps vision of some of the animals - Some animals (including birds, bees and reptiles) are able to see the UV light around locate many ripe fruits, flowers and seeds stand out more strongly from the background. Fruits, flowers and seeds are often very different from the way humans see them. For example, when you see the UV light, flowers have different brands online, which can help the bees and the birds lead the nectar.
Navaids certain insects - Many insects use the UV emissions of celestial objects as references to navigate in flight. That's why sometimes a light attracts flying insects by disrupting their navigation process.
Zapping bugs
Zapping errors: Video
Useful for disinfection and sterilization - UV has positive applications in the fields of disinfection and sterilization. UV can effectively "kill" (disable or destroy) microorganisms such as viruses and bacteria, for example, to hang cloth diapers, underwear and tea towels outdoors on the clothesline. To destroy microorganisms, UV rays penetrate the cell membrane, destruction of DNA, and therefore its ability to reproduce and multiply stops. This destructive effect is why we can use antibacterial UV lamps for disinfection and sterilization.
The negative effects (harmful) UV
Mole and melanoma
Video: Moles and melanoma
Skin Cancer Causes - UV environment is a carcinogen for humans. It is the causative agent of the most important and universal cancer in our environment. There is very strong evidence that the three main types of skin cancer (basal cell carcinoma, squamous cell carcinoma and melanoma) is caused by sun exposure. Studies show that nearly 90 percent of skin cancers are due to UV radiation.
Image: rear sunburn
Causes sunburn - UV burns the skin. Sunburn is a burn that occurs when skin cells are damaged. These lesions of the skin is caused by the energy absorption of UV rays. The extra blood flow to the damaged in an attempt to repair the skin, so your skin becomes red when you are sunburned.
Damage the immune system - Overexposure to UV radiation has an adverse effect on the immune system suppression. Scientists believe that sunburn can alter the distribution and function of white blood cells that fight against the disease in humans for up to 24 hours after exposure to the sun. Excessive exposure to UV rays can cause even more damage to the immune system of the body. The immune system defends the body against bacteria, microbes, viruses, toxins and parasites (disease and infection). You can see how the effectiveness of the immune system is to observe how rapidly disintegrates something when he dies and the immune system no longer works.
An eye injury - Prolonged exposure to UV light or high intensity UV light (eg, tanning beds) in damages the tissues of the eyes and may cause "burn" the surface of the eye, called "Blindness Snow "or photokeratitis. The effects usually disappear within a few days, but can lead to complications in the future. In 1998, the Journal of the American Medical Association reported that even small amounts of sunlight may increase the risk of eye damage such as cataracts (which is not the cause blindness), pterygium and pinguecula. The UV rays in the eyes is cumulative, it's never too late to start protecting your eyes.
Image: Tanned elderly
Skin Age - accelerated UV aging UV destroys skin collagen and connective tissue under the top layer of the skin. This causes wrinkles, dark spots, "liver", and loss of skin elasticity. The difference between the tone of the skin, wrinkles, pigmentation or the lower arm of a person and the upper side of the same arm illustrate the effects of sun exposure on the skin. Usually, the upper arm has had more exposure to the sun and more sun damage shows. Because photoaging of the skin is cumulative, it's never too late for a person to start sunscreen program. Otherwise, if a tan may look good now, you may have to pay for it with leather and wrinkled skin or skin cancer later.
Plastic weakens - Many polymers used in consumer products (including plastics, nylon and polystyrene) are broken or lose strength due to exposure to UV light.
Bland colors - Many pigments (used for food, color cosmetics, fabric, plastic, paint, ink and other materials) and dyes absorb UV and color change. Fabrics, furniture and paintings need protection against UV rays (fluorescent lamps and sunlight) to prevent fading or loss.
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