It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
The sunshine vitamin may protect against a host of diseases, including osteoporosis, heart disease, and cancers of the breast, prostate, and colon. What's more, sunlight has other hidden benefits—like protecting against depression, insomnia, and an overactive immune system.
Does this guy understand that ultraviolet B (UVB) rays are what both make vitamin D and burn the skin? If you put on sunscreen that blocks UVB, then you block the production of vitamin D. Pretty much completely. Even weak sunscreens with an SPF of 8 block 95 percent of vitamin D synthesis. So greasing up with sunscreen is definitely not going to have you “swimming in vitamin D.”
In fact, if you’re not careful, you’ll end up more prone to the worst kind of skin cancer: melanoma. Why? Because a sunburn is nature’s way of telling you you’re getting too much sun. Unless you’re a moron, you get out of the sun before you get badly burned. With graduated sun exposure you develop a tan, which prevents burning because the tan blocks the UVB much like a sunscreen does. But the tan blocks UVA also. UVA is the wavelength that doesn’t really burn but does stimulate the melanocytes (the pigment producing cells), which can cause melanoma. If you slather on the sunscreen and stay out in the sun all day, you don’t get burned, but you do get a ton of UVA, which, until fairly recently, wasn’t blocked by sunscreen. Now sunscreens contain agents that block both UVB and UVA, but no one knows yet whether these will prevent melanoma in the long run.
The paradox of melanoma is that this cancer typically develops as a response to too much sun but people with chronic sun exposure incur it less frequently than those with sporadic sun exposure. This paradox can be easily explained. Those who are out in the sun a lot develop a tan. The tan blocks UVA, so there is less of the simulation for melanoma. Those who go into the sun occasionally – office workers who vacation at the beach for a week – use sunscreen and stay out too long, receiving way too much UVA. UVA that increases the risk for melanoma.
Originally posted by DevolutionEvolvd
reply to post by Orion65
Current recommendations are so low due to worries of poisoning. Though Vitamin D is fat soluble, recent studies have demonstrated that 1000-2000 IU's is perfectly healthy and very beneficial.
Thanks for the link.
Originally posted by DevolutionEvolvd
The evidence is just pouring in on the benefits of Vitamin D and the perils of a deficiency. The reports are being corroborated by multiple different journals.
Apparently, optimum vitamin D levels contribute to fat loss.
The number of studies reporting beneficial effects of sunlight and vitamin D on several types of cancer with a high mortality rate is growing rapidly. Present health recommendations on sun exposure are mainly based on the increased risks for skin cancer. We reviewed all published studies concerning cancer and sun exposure and vitamin D, respectively, excluding those about skin cancer. Most identified ecological, case-control and prospective studies on the incidence and mortality of colorectal, prostate, breast carcinoma and non-Hodgkin lymphoma reported a significantly inverse association with sun exposure.
The results of the included studies on the association between cancer risk and vitamin D were much less consistent. Only those studies that prospectively examined the 25-hydroxyvitamin D serum levels in relation to risk of colorectal cancer are homogeneous: they all reported inverse associations, although not all reaching statistical significance.
The results of the intervention studies are suggestive of a protective role of high doses of vitamin D in cancer, but they have been criticized in the literature. We, therefore, conclude that there is accumulating evidence for sunlight as a protective factor for several types of cancer. The same conclusion can be made concerning high vitamin D levels and the risk of colorectal cancer. This evidence, however, is not conclusive, because the number of (good quality) studies is still limited and publication biases cannot be excluded. The discrepancies between the epidemiological evidence for a possible preventive effect of sunlight and vitamin D and the question of how to apply the findings on the beneficial effects of sunlight to (public) health recommendations are discussed.