Recent research, however, suggests there's a flip side. It urges people to get at least 15 minutes of unprotected exposure to sun a couple of times a week so the body can make enough vitamin D, which is said to combat cancers including breast, colon, ovarian and prostate. But a single study or even a few are rarely sufficient for making definitive declarations. It takes a substantive body of research, the kind that already exists and so clearly links sun exposure to skin cancer, says Langley. "Unfortunately, you've got compelling scientific evidence that sun can generate skin cancers, and then you have all this soft science that has not been demonstrated in careful clinical studies. It's potentially misleading and can cause confusion about what people should do in the sun."(Emphasis mine).
Meanwhile, the fine print in studies about the benefits of sunlight indicate exposure should be to only 25 per cent of your body surface area, roughly meaning your hands, arms and face. "Most people get that going to and from their car, or to get groceries in the summertime," says Dr. Jason Rivers, a professor of dermatology at the University of British Columbia and former national director of the sun awareness program for the Canadian Dermatology Association. "That's much different from somebody lying on the beach for three to four hours with a bikini on."
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posted by fixedgear at 8:35 AM on June 23, 2005