The argument never stops. Human skin has special cells, melanocytes. These cells provide natural, built-in sun protection. You can see it in action each time you tan. Melanocytes produce dark brown substance, called melanin, which does not allow sun rays to penetrate deep into
skin layers as it would be damaging. At
same time sun light stimulates cell generation, skin becomes thicker, and therefore more resistant to UV rays. Turns out
sun is actually good for
skin.
Well... People with fair skin don't have enough melanin producing cells, their sun protection mechanism is not strong, and these people get sun burns pretty quickly. UV rays have a very strong biological effect, they can damage protein molecules and even alter genetic material causing healthy cells become malignant. So tanning is bad.
Could say so, but... Sun energy is good for health. Increased blood flow to
skin stimulates cell regeneration, helps to fight acne, smooth scars and minor skin imperfections. Sun light is a necessary factor for Vitamin D production. Sun stimulates immune system and makes us feel happier and healthier.
So where is
truth? As always, in
middle.
Human body needs sun, but at
same time it must be protected. To make contacts with sun enjoyable (as they should be), remember: - The most dangerous sun is between 10 a.m. and 3 p.m. - Sun rays penetrate glass windows, so being in
sunny spot inside your house or while driving is just as dangerous as being outside. - Don't be deceived by cold weather or clouds: clouds let UV rays through, and UV radiation is not felt as heat. - Water won't prevent sunburns as
harmful rays can penetrate water three feet deep.
Wearing sunblock at all times is
best thing you can do for your skin. Apply it 20-30 minutes before going outside so that
lotion absorbs and starts working. People with lighter skin should take extra precautions: wear hats, avoid direct sun exposure, use sunblock with a higher SPF and reapply it more often (remember, your skin does not have a strong sun protection mechanism, so it needs your help).