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The Science of Tanning

There's a lot of controversy surrounding tanning. Some people say a little sun is good for you (it's a source of vitamin D, you know), while others say you should stay in the shade to avoid skin cancer. But how many people really know what's going on in your skin to make you turn brown? Get the good on tanning here!

What is a Tan?

Melanocytes are special skin cells that produce melanin (skin pigment) when they are exposed to ultraviolet light in sunlight. The pigment absorbs UV radiation in sunlight, so it helps to protect skin cells from UV damage. Your body actually produces two kinds of pigmant. One is called eumelanin and it is responsible for the golden brown color we normally associate with tanning. Another pigment is called phaeomelanin and it produces a red color. Redheads and blondes produce more phaeomelanin and less eumelanin, which is why they don't tan as well.

How Does Your Body Know It's Sunny Out?

Sunlight (or UV light from tanning beds) affects the pituitary gland (a gland at the base of the brain that secretes hormones) which then produces MSH (melanocyte-stimulating hormone). This hormone flows through the bloodstream to the melanocytes, which makes them able to produce more melanin. Since the pituitary gland is tied into the optic nerve, (the nerve in your eyes that lets you sense light), wearing sunglasses makes you tan less. Weird.

Tanning and Race

Different races tan differently (and some don't tan at all). Caucasians (white people) and other lighter skinned races tan the way explained above. People of darker races produce melanin continuously (without having to go in the sun), which means their skin is always pigmented (dark) to varying degrees. People of dark races are much less likely to get skin cancer because their cells are constantly protecting them from UV radiation.

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What is the minimum SPF You Should Wear?

  • At least SPF 10
  • SPF 100
  • SPF 30
  • I don't wear sunscreen

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inkdeath
inkdeath posted in Debating:
"IndigoTiger19" wrote: lovesciencegirl12 Omg thank you i really dont get why people think its a fruit like seriously its not rocket science ;) You seem a little sassy in my opinion. You are cute though. 
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Ribsey
Ribsey posted in Say Anything:
8/10.
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genius@23
genius@23 posted in Say Anything:
8.5/10
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rainbowpoptart
Neither Clinton nor Obama can rid of our rights to guns. It's against the second amendment, and a terrible thing to do overall for reasons that probably don't need explaining. However, we do need to monitor who we do and don't give weapons to. As you said, it's not the gun that harms others. It's the people.
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AlphaT
AlphaT posted in Debating:
I have too low an expectation of society for them to recognize something as right or wrong, and base their disapproval on the issue and not the people backing it. 
reply about 1 hour