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09-18-2008
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There's no such thing as a 'safe' suntan, researchers warn
There may be no such thing as a 'safe' tan based on ultraviolet (UV) radiation, according to a... |
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Re: There's no such thing as a 'safe' suntan, researchers warn
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Vitamin helps prevent skin cancer
Thursday, 20 November 2008
Clinical Oncolgoical Society of Australia
Nicotinamide (VitB3), a vitamin found in common foods like meats, nuts, grains and cereals, may provide the next advance in skin cancer prevention, according to new research from the University of Sydney.
Presenting the results of a trial to the Clinical Oncological Society of Australia's 2008 Annual Scientific Meeting, Associate Professor Diona Damian said tests had shown the vitamin prevented damage from ultraviolet (UV) radiation by protecting the immune system.
"UV radiation in sunlight suppresses the skin's immune system and makes it more susceptible to skin cancer," Professor Damian said. "Our research found that nicotinamide can prevent the immunosuppressive effects of UV by energising cells so they maintain their immunity."
Professor Damian said the tests on volunteers using nicotinamide both as a lotion and in tablet form offered equally strong protection, against both UVB and UVA.
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Vitamin helps prevent skin cancer*(ScienceAlert) |
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Re: There's no such thing as a 'safe' suntan, researchers warn
No such thing as a safe sunscreen? Home
Do nanoparticles in sunscreens and cosmetics penetrate the skin?
Do nanoparticles in sunscreens and cosmetics penetrate the skin? | nano.foe.org.au
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"There are sunscreens out there being sold right now that contain nano ingredients that could be causing quite serious toxicity problems," Georgia Miller, from Friends of the Earth (FOTE), said.
Associate Professor Tom Faunce, from the Australian National University (ANU), says concerns centre on nanotechnology's unknowns.
"The big issue is to what extent do they [nano particles] get inside the cells through the dead skin on the outer surface of the body?" he said.
"To what extent do they accumulate? To what extent do they actually cause long-term injury?
"We really don't have this information."
Many sunscreens contain titanium dioxide and zinc oxide - effective reflectors of the sun's rays - but they leave an inconvenient thick, sticky, white layer on the skin.
Making these ingredients nano-sized - the particles used in sunscreen are about 200 times smaller than human blood cells -mean they rub on clear.
"A nanometre is a billionth of a metre," Dr Faunce said.
"We're talking about particles that are about 40 nanometres - very small, but they actually have a larger surface area at that size.
"So they still have the capacity - in fact an enhanced capacity in some cases - to reflect ultraviolet rays."
This all might sound attractive, but according to Dr Faunce there are concerns about what happens if these nano particles were to enter the body.
Unable to convince the Government to remove the products from shelves, FOTE is taking on manufacturers and alerting consumers of what they say are the potential dangers of particular sunscreens.
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Nano-tech sunscreen presents potential health risk - ABC News (Australian Broadcasting Corporation)
Brief background information on nanoparticles in sunscreens | nano.foe.org.au
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Early studies on the safety of zinc oxide nanoparticles used in sunscreens are reassuring, say scientists.
But the studies still can't tell us the actual risk of using products containing these tiny particles.
Two of the first Australian studies on the safety of zinc oxide nanoparticles will be presented later this month at the International Conference on Nanoscience and Nanotechnology in Melbourne.
One study looked at what happens when sunscreen containing these nanoparticles is applied to human skin.
"You put these materials on your skin and they disappear," says researcher Professor Brian Gulson from Macquarie University's Graduate School of the Environment in Sydney.
"Surely they must go somewhere. Are they being absorbed through the skin?"
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Tests on sunscreen nanoparticles 'reassuring' (ABC News in Science) |
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Re: There's no such thing as a 'safe' suntan, researchers warn
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One in three kids still pro-tanning
Thursday, 05 February 2009
University of Otago
Building a positive attitude towards Sun protection could be the key to reducing children's skin cancer risk.
Educating school children about the health risks of excessive and harmful Sun exposure is not enough in itself to ensure Sun-smart behaviour - pro-tanning attitudes need to be tackled too, according to latest University of Otago research.
The study, involving nearly 500 New Zealand primary and intermediate school children, found that older children knew more about the risks, but their attitudes and behaviour in the Sun were much less protective than those of their younger, less-knowledgeable peers.
The findings are published in the Journal of Paediatrics and Child Health.
Paper co-author Dr Caradee Wright says that it was only when children held positive attitudes about Sun protective behaviour that knowing about excess Sun exposure risk was significantly associated with being Sun-smart.
"Our findings indicate that attitudes should be specifically targeted when designing Sun protection and skin cancer prevention programmes aimed at influencing the Sun-related behaviours of children."
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One in three kids still pro-tanning(ScienceAlert) |
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Re: There's no such thing as a 'safe' suntan, researchers warn
Hi I've read some interesting research from M.D. Anderson in Houston linking some melanoma to hypothyroidism. I was diagnosed with a melanoma in October of 2001 and found out I had hypothyroidism in February 2002. I wonder if the hypothyroidism causes melanin to build up in the body in some way? I know hypothyroidism can slow down apoptosis of cells. Staying out of the sun since then has caused vitamin D deficiency in me so I now take supplements.
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Re: There's no such thing as a 'safe' suntan, researchers warn
Interesting stuff,
Last summer I spent every waking hour in the sun, very often with no shirt on, doing concrete placing and finishing.(labouring work)
I turned brown, and at the beginning of the year I was white. I am white now, since winter. However, I took precautions to ease myself into it, so I never did burn. I waited untill I had sufficient tan before exposing myself for a long time.
wondering..
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