What is UV light? Simply put, it is electromagnetic radiation with a wavelength that is shorter than that of visible light. Visible light, UV rays, X-rays-all of these are just names for different wavelengths of electromagnetic rays. It’s called ultra-violet because these frequencies are higher than the wavelengths that we humans identify as violet. There are three forms of UV: UVA, UVB & UVC.
While UVA & UVB both reach the earth, UVC is usually absorbed by the ozone layer. UVA & UVB both contribute to tanning of the human skin.
UVA is the most commonly found form of UV, and is responsible for the tanning effect we see in our skin after time spent in sunlight, and can cause sunburn if exposure is excessive. The atmosphere does very little to block this kind of UV. Too much exposure can cause our skin to grow tough, hard, and wrinkled.
UVB, on the other hand, is what can cause our skin to appear red or burned with overexposure. With moderate exposure, the body repairs the damage and produces melanin, thus causing a secondary tan that develops a day or two after exposure.
UVB is the type of ray that is necessary to stimulate the production of VITAMIN D in our bodies. Vitamin D is an essential vitamin that has been linked to many health benefits. Vitamin D deficiency has also been linked to many health problems.
“Jogging in moderation is very beneficial but excessive jogging could be harmful to joints, specially the knees.”
“Consuming protein in moderation is very beneficial to muscles and joints, however excess protein can lead to kidney damage”.
“Saying that UV exposure is harmful and should be avoided is as wrong as saying that water causes drowning, and therefore we should avoid water.”
Going further Dr. Joseph Mercola, a well known and accomplished physician who has been featured in Time magazine, CNN, Fox News
and ABC News recommends the use of safe tanning beds to ensure individuals get the right dose of UVB exposure for essential Vitamin D production.