Why is avoiding the sun's rays considered "healthy"?
My proposition is: a moderate amount of unshielded sun exposure is robust, and avoiding the sun altogether is not healthy.
Answers: Human skin is evolved for sun exposure, but the tolerable amount of it depends on ethnicity.
Cultures that hold evolved closer to the colder weather of the polar regions have awfully light skin, which allows their bodies to hold more light and hang on to them warmer.
Cultures that hold evolved near the extraordinarily hot temperatures of the equator hold adapted to this extreme heat next to darker colored skin. This allows their bodies to deflect more table lamp and keep them cooler.
A little sun is honest, but because of the amount of new research individual done on the effects of sunlight to the human body, people are more aware immediately of what harm overexposre can do.
Sunlight is in fact good for you within moderate amounts--not just physically, but mentally. I judge evolution has made humans dependant on the sun, but some culture take this for granted by tanning themselves into a walking Slim-Jim.
Uhmm-er, okay, certainly you're right. Humans need in the order of 15 minutes of sun a day to produce the Vitamin D they require for strong bones and teeth within conjuction with calcium. They can return with Vitamin D from a supplement, but that's not as efficient as the sun. Just don't find burned or over exposed. That's where the sun sabotage and skin cancer are most likely to come within.
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