July 20th, 2011 by HarvardHealth in Health Tips
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It doesn’t make sense: If sunlight causes cancer, why are human beings so drawn to it, flocking to sunny beaches for vacation time and hoping for sunshine after a rainy spell?
One answer, says David Fisher, chief of dermatology at Harvard-affiliated Massachusetts General Hospital in Boston, may be that humans are literally addicted to sunshine so our skin can make vitamin D. New evidence suggests that we get the same kick out of being in the sun that we get from any addictive substance or behavior. It stimulates the so-called “pleasure center” in the brain and releases a rush of feel-good chemicals like endorphins.
So there may be more than a desire to look good in a tan behind the urge to soak up the sun’s rays. This craving may be a survival mechanism that evolved over thousands of years because humans need vitamin D to survive. Skin makes this crucial vitamin when it is exposed to sunlight. There isn’t much vitamin D in food (except in some of today’s fortified foods) so the human brain rewards us with a rush of pleasure when we seek out the sun and get vitamin D.
Seeking sunshine can be downright dangerous. As Fisher points out, Read more »
*This blog post was originally published at Harvard Health Blog*
May 13th, 2010 by Steve Novella, M.D. in Better Health Network, Health Policy, Opinion, Research
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On SBM we have documented the many and various ways that science is abused in the pursuit of health (or making money from those who are pursuing health). One such method is to take a new, but reasonable, scientific hypothesis and run with it, long past the current state of the evidence. We see this with the many bogus stem cell therapy clinics that are popping up in parts of the world with lax regulation.
This type of medical pseudoscience is particularly challenging to deal with, because there is a scientific paper trail that seems to support many of the claims of proponents. The claims themselves may have significant plausibility, and parts of the claims may in fact be true. Efforts to educate the public about such treatments are frustrated by the mainstream media’s lazy tendency to discuss every study as if it were the definitive last word on a topic, and to site individual experts as if they represent the consensus of scientific opinion.
Recent claims made for low-dose naltrexone (LDN) fit nicely into this model –- a medical intervention with interesting research, but in a preliminary phase that does not justify clinical use. And yet proponents talk about it as if it’s a medical revolution. Read more »
*This blog post was originally published at Science-Based Medicine*
