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60 minutes of sunlight needed to decrease vitamin D deficiency in sunny climate – Dec 2012

Vitamin D status and health correlates among apparently healthy participants in an urban, sunny region.

Cent Eur J Public Health. 2012 Dec;20(4):262-9.
Vallianou N, Bountziouka V, Akalestos T, Evangelopoulos A, Vogiatzakis E, Bonou M, Barbetseas J, Avgerinos PC, Panagiotakos DB.
General Hospital of Athens Polykliniki, Athens, Greece. natalia.vallianou at hotmail.com

AIM: To assess vitamin D status and health correlates in a sample of apparently healthy Caucasian participants residing in an urban area, Athens, with latitude 370 58' 0" N and longitude 230 43' 0" E, after taking into consideration a broad range of purported biological, behavioural and environmental factors.

METHOD: Men and women 35+ years from a selected population (n = 490) were studied. Participants completed a detailed questionnaire regarding socio-demographic, lifestyle, clinical and dietary characteristics. Biomarkers were measured after 12 h fasting. Linear and multinomial regression models were used to evaluate the association between 25(OH)D and determinants of vitamin D status.

RESULTS: Results revealed that one hour increase of sunlight exposure decreased the odds of having D deficiency (i.e., < 20 ng/mL) by 70% (OR = 0.30, 95% Cl: 0.20-0.45), adjusted for age, sex, family status, physical activity, smoking habits, BMI, triglycerides, parathyroid hormone, uric acid, haptoglobin, folate acid and haemoglobin, as compared to sufficient levels (i.e., >30 ng/mL). Regarding biomarkers, parathyroid hormone and haptoglobin were found to be related with the odds of having vitamin D deficiency (OR = 1.11, 95% CI: 1.05-1.16; OR = 1.02, 95% CI: 1.00-1.03, respectively) as compared to the sufficient levels.

CONCLUSIONS: Sufficient serum vitamin D levels were observed among participants with characteristics associated with reduced cardiovascular risk, such as normal BMI, increased physical activity, decreased parathyroid hormone and decreased inflammatory markers. Even a slight increase in sunlight exposure could have beneficial effects on serum vitamin D concentrations and eventually on haemoglobin and inflammatory markers levels, thus providing a simple and inexpensive lifestyle intervention that promotes public health.

PMID: 23441390

  PDF added Oct 2015


Note:

  • Yes, about 1 hour daily sunshine is the minimum needed, vs the 10 minute myth
  • abstract does not indicate amount of clothing
  • abstract does not indicate skin color – suspect much more needed for those with dark skins
  • suspect this study was done during the summer – more time would be needed in other seasons
  • latitude of Athens: 38 degrees
  • Greek UV Index vs month Jan: 3, Feb: 4, March: 5, April: 8, May: 9. June: 9 July: 10, Aug: 9, Sept: 7, Oct: 4, Nov: 3, Dec: 2
    from World Health Organization

See also VitaminDWiki

  • 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)

Attached files

ID Name Comment Uploaded Size Downloads
6101 Vitamin D status and health correlates - 2012.pdf PDF admin 25 Oct, 2015 18:46 389.44 Kb 647
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