All posts tagged 'UVA'
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Posted @ 6/6/2011 12:48 PM By Terri Wiebold
… for us to get the required amount of invaluable sunlight.
Sunlight is essential to the human body. The light helps to regulate the body’s internal clock, and it also makes fat-soluble Vitamin D. We need to be cautious of exposure to sunlight, though, because it can be damaging to our bodies.
Benefits of Sunlight:
The body’s internal clock is regulated by light. Light enters the eyes, and the optic nerve carries the sensory responses to the pineal gland. The pineal gland controls the production of melatonin, which helps to set our body clock.
Although we can get our Vitamin D through some foods, we absorb it best from skin exposed to the sun.
Detriments of Sunlight:
Sunlight has two kinds of rays, UVA (Ultraviolet A) and UVB (Ultraviolet B). UVA rays are absorbed more deeply into the skin and, therefore, cause more skin damage. UVB rays cause the immediate burning of the skin, which we experience as sunburn. Both types of rays are also reflected off snow, water, and sand.
Skin damage from UVA and UVB rays can result in wrinkles, spots, and skin cancer. The most dangerous form of skin cancer is Melanoma. This is a deadly skin cancer, and it has been increasing in occurrence every year for the past 10 years.
Next week: evaluating your sunscreen choices