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What is the #Ultraviolet #Index & how to use it

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What is the #Ultraviolet #Index & how to use it

Postby Admin » 18 May 16 16:56

The ultraviolet index or UV index is a measurement of the strength of the sun's ultraviolet rays. It is 0 in the dark of night and 10-11 in the middle of a summer day with no cloud cover. This index was developed by Canadian scientists in 1992. It has now been adopted by the World Health Organization and most government entities as a mechanism to assess the sun's strength and make recommendations on sun exposure.



At first the numbers may seem random, but it is in fact a linear scale. So, if you determine that you are a skin type II and burn in 30 minutes at a UV index of 6, then you will likely burn in 15 minutes at a UV index of 12.

The UV index is one of the three key factors for managing your sun exposure. You need to know your skin type, which determines your reaction to sun, the UV index, how strong the sun is, and then determine the proper duration to give you a minimal erythemal dose of UV exposure to produce vitamin D and other healthy properties - including nitric oxide - without burning. You just want to get a *smidge* pink the next day.

One of the easiest ways to know the UV index wherever you are is to download the free dminder app on your phone!

Want to understand skin type? Read last week's news.


Mathematical Ramblings from a Vitamin D Scientist
Editorial by
Cedric F. Garland, Dr., PH, FACE
UC San Diego School of Medicine

How should the US best focus its efforts?

Last week there was an article which summarized Richard Weller's position on sunlight - that it is necessary. One of the quotes was that in the UK "deaths from heart disease are a hundred times higher than deaths from skin cancer."

I decided to see if it is true for the US as it is a great statistic to use in our work. Here's what I found using American Cancer Society (ACS) and American Heart Association (AHA) data:
787,000 people die from cardiovascular disease each year in the US. This includes 375,000 from heart disease and other deaths from cerebrovascular disease. (Source: AHA)
10,130 people die from melanoma and 2,000 die from basal or squamous cell skin cancer each year in the US. Sum = 12,130. (Source: ACS)
The ratio is 787,000/12,130 = 65. Not quite as high as the 100 that Weller mentioned for the UK, but it still means that skin cancer deaths are only 1.5% of cardiovascular disease deaths, so why not focus on the 98.5% of the total of these, rather than the 1.5%? A ratio of 65 deaths from all cardiovascular disease events combined is still extremely more deaths than those attributed to skin cancer.
Since we know that vitamin D from the sun or elsewhere will prevent approximately 80% of cancer (Lappe et al., 2007), we could include cancer deaths in addition to cardiovascular deaths. 582,870 Americans die of cancer other than of melanoma or other skin each year (ACS, 2016 projection).
Multiply that by 80% preventable and you get 582,870 X 80% = 466,295 preventable deaths from cancer due to vitamin D deficiency. The ratio is 466,295/12,130 = 38. It's amazing that we are losing 466,295 people to cancer each year due to vitamin D deficiency and no one besides us cares.
If we add all cardiovascular deaths and deaths from non-skin cancer, we get 787,000 + 582,870 = 1,369,870 deaths. The ratio of this figure to skin cancer deaths is 1,369,870/12,130 = 113.
So we in the USA have 113 times the number of deaths from cardiovascular disease and non-skin cancer compared to deaths from skin cancer. As a nation, we really do have to quit being so preoccupied with trying to prevent skin cancer. It's costing us thousands of lives each year.
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