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Vitamin D from sun - minutes for 1000 IU (wrong in many ways) – April 2019

Estimation of exposure durations for vitamin D production and sunburn risk in Switzerland

Journal of Exposure Science & Environmental Epidemiology (2019)
A. Religi, C. Backes, A. Chatelan, J.-L. Bulliard, L. Vuilleumier, L. Moccozet, M. Bochud & D. Vernez

Vitamin D Life

Ignored


3X less Vitamin D from the sun if dark skin genes(250 IU)
4X variation between individuals from the same amount of sun (500- 2000 IU)
4X difference in the amount of skin exposed to the sun (500- 2000 IU)
2X? less burn if start with a good level of vitamin D
4X more vitamin D if wear a UV transparent shirt

Incorrect


3X less Vitamin D from the sun if elderly (250 IU)
     text claimed 2X more time for elderly, but chart appears to say less time
4X more vitamin D is actually needed (4,000 IU)


Yes, too much sun can result in sunburn, especially if you have a low level of vitamin D


No – 10 minutes per day of sun-UVB is NOT enough contains

  • 5-10 minutes provides only 1,000 IU ONLY IF you are near the equator
  • AND young
  •  AND not obese
  •   AND have light skin
  •    AND it is summer
  •     AND it is the middle of the day
  •      AND you have lots of skin exposed to the sun
  •       AND you are lying down
  •        AND you are not wearing sunscreen
  •         AND you have a healthy Liver
  •          AND no clouds and nor air pollution
  •           AND you have good response to sunshine (4X variation between individuals)


and, from 2009
see wikipage http://www.vitad.org/tiki-index.php?page_id=1689

Note: The body is aded in repairing skin damage by Vitamin D
It is not know how long the repair takes - minutes, hours, days...
It might be that the damage is repaired in 2 hours


 Download the PDF from Sci-Hub via Vitamin D Life

Following images are for Locrano, 46 degrees latitude and low elevation

Image
Note: This seems to indicate that seniors need far less time in the sun to get 1,000 IU that younger adults,
but their study and others say the opposite

Image

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Although overexposure to solar ultraviolet radiation (UVR) is responsible for cutaneous melanoma and epithelial skin cancer and can cause negative health effects such as sunburn, a “little and often” exposure regime is often suggested to produce naturally recommended vitamin D levels, being essential for skeletal health. This study aimed to quantify solar UV doses needed to trigger 1000 International Units (IU) vitamin D doses and, at the same time, producing sunburn in Switzerland. Solar UV erythema irradiance (in mW/m2) measured at four meteorological stations in Switzerland for the period 2005–2017 were used to evaluate effective solar UV radiation producing 1000 IU vitamin D doses in skin phototype II and III individuals. Daily solar UV exposure durations (in minutes) needed to produce vitamin D with limited sunburn risk were estimated while considering mean vitamin D food intake of the Swiss population and seasonal skin coverage. In summer and spring, with 22% of uncovered skin, 1000 IU vitamin D doses are synthesized in 10–15 min of sun exposure for adults. Exposure durations between erythema risk and 1000 IU vitamin D production vary between 9 and 46 min. In winter and autumn, the recommended vitamin D production without sunburn risks often unachievable, since up to 6.5 h of sun exposure might be necessary considering 8–10% of uncovered skin surface. The vitamin D food intake only represented 10% of the recommended vitamin D production and remained unchanged throughout the year. These findings might clarify why vitamin D deficiency is common in Switzerland. Moreover, exposure durations between recommended vitamin D and increased sunburn risk might only differ by few minutes. Without additional oral vitamin D supplementation, daily doses of vitamin D (1000 IU) are not reachable in autumn and winter months in Switzerland.


Created by admin. Last Modification: Saturday April 20, 2019 21:38:45 GMT-0000 by admin. (Version 11)

Attached files

ID Name Comment Uploaded Size Downloads
11784 Lorcano map.jpg admin 17 Apr, 2019 17:19 42.00 Kb 369
11783 Locarno months.jpg admin 17 Apr, 2019 17:18 42.42 Kb 344
11782 Locarno.jpg admin 17 Apr, 2019 17:18 48.77 Kb 357
11777 1000 IU vs sunburn.pdf PDF 2019 admin 16 Apr, 2019 19:33 1.06 Mb 292
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