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Why Does the Sun Make Hair Lighter?

BY MICHELE DEBCZAK

Some people don’t need to visit the salon to alter their hair color. After spending enough time in the sun during the summer months, their hair may start to get naturally blonder. Though summertime highlights may appear to breathe new life into a ‘do, that’s not actually the case. Hair gets lighter in the summer as a result of damage from the sun.

According to Popular Science, too much exposure to sunlight wears down the melanin in our hair. Melanin is a polymer that gives our hair and skin pigmentation, and it has evolved to protect our delicate DNA from radiation by absorbing and scattering ultraviolet light. But melanin isn’t a foolproof barrier against the sun’s harmful effects. After spending enough time in the sun, melanin starts to break down, a when this happens hair loses pigmentation. Strands of hair that have lost melanin can resemble naturally blonde or fair hair.

Sun also affects the melanin in our skin, but in a different way. Instead of losing pigmentation after spending too much time outdoors, our bodies ramp up melanin production to provide us with the extra protection we need. This is why sun makes skin look darker instead of bleaching it. Hair is made of dead cells, so it’s unable to defend itself against sun damage.

You may not mind your hair changing color in the summer, but that’s just one symptom of overexposure to UV rays. Sun-bleached hair can also become dry, frizzy, and brittle. To protect your hair from the sun, consider wearing hats or head coverings—especially if you’re out in the middle of the day. You can also treat your hair with SPF products just as you would your skin.

source: MentalFloss, Cambridge Dictionary 

A cikk elolvasása után találd meg a cikkből azokat a szavakat, melyek angol magyarázatát itt találod.

1. to change something, usually slightly, or to cause the
   characteristics of something to change
2. a situation or condition that makes someone likely to be harmed,
   esp. because the person has not been protected from something dangerous
3. needing careful treatment, especially because easily damaged
4. long and thin things such as hair, spaghetti or rope
5. to look like or be like someone or something
6. to remove the colour from something or make it lighter, with the use of
   chemicals or by the effect of light from the sun; to become lighter in this way
7. very curly and not smooth or shiny
8. delicate and easily broken

keys/megoldások: 1. alter; 2. exposure; 3. delicate; 4. strands; 5. resemble; 6. bleaching; 7. frizzy; 8. brittle