The role of sunlight exposure in determining the vitamin D status of the UK white Caucasian adult population.
Br J Dermatol. 2010 Aug 12.
Webb AR, Kift R, Durkin MT, O'Brien SJ, Vail A, Berry JL, Rhodes LE.
School of Earth Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK.
ABSTRACT Background: Vitamin D is necessary for bone health and potentially protective against a range of malignancies. Opinions are divided on whether the proposed optimal circulating 25(OH)D level (>/= 32 ng/mL) is an appropriate and feasible target at population level. Objective: We examined whether personal sunlight exposure levels can provide vitamin D sufficient (>/= 20 ng/mL) and optimal status in the UK public.
Methods: This prospective cohort study measured circulating 25(OH)D monthly for 12 months in 125 white Caucasians aged 20-60 years in Greater Manchester. Dietary vitamin D and personal ultraviolet (UV) exposure were assessed over 1-2 weeks in each season. The primary analysis determined the post-summer peak 25(OH)D required to maintain sufficiency in winter-time.
Results: Dietary vitamin D remained low in all seasons (median 3.27 mug/day, range 2.76-4.15) while personal UV exposure levels were high in spring and summer, low in autumn and negligible in winter. Mean 25(OH)D levels were maximal in September (28.4 ng/mL; 28% optimal, zero deficient (< 5 ng/mL)), and minimal in February (18.3 ng/mL; 7% optimal, 5% deficient). A February 25(OH)D level of 20ng/mL was achieved following an average late summer level of 30.4 (25.6 to 35.2) and 34.9 (27.9 to 41.9) ng/mL in women and men, respectively, with 62% variance explained by gender and September levels.
Conclusions: Late summer 25(OH)D levels approximating the optimal range are required to retain sufficiency throughout the UK winter. Currently the majority of the population fails to reach this post-summer level and becomes vitamin D insufficient during the winter. PMID: 20716215
- - - - - - - - - -
- All items in category Europe
- Vitamin D in the UK = VitaminDAsssociation
- Vitamin D UK 45 year olds by Hyppönen
- Sunlight Robbery - Gilles Nov 2010 full text
- UK elderly need vitamin D – 86 percent less than 30 ng - Jan 2010
- UK workshop on diet, sunlight, and vitamin D status – June 2010
- Scotland and Vitamin D
- Scottish doctors ignoring vitamin D? VitaminDWiki Blog - Feb 2012
- Overview Deficiency of vitamin D
- UK survey of vitamin D knowledge of midwives - 2011
- All items in Noontime Sun and vitamin D
- No – 10 minutes per day of sun-UVB is NOT enough
- Urban residents had 2X less vitamin D – 2008
- 4X more suburban UV than urban UV – Nov 2010
- An overview analysis of the time people spend outdoors – Dec 2010
- Scared Out of the Sun for Fifty Years – Jan 2011
- Increased UVB intensity did not increase vitamin D generated – Nov 2010
- Is there a limit as to how much vitamin D the body will produce over a several day time period? replenish cholesterol?
- For small amounts of sunshine the amount of skin exposed may not matter – Jan 2011
- Minutes in the Sun for 1000 IU default 30 degrees North
- Face 3.5%, neck 2%, trunk 26%, hands 6%, arms 14%, legs 14%, thighs 18%
- Sun increases but tanning bed decreases longevity - April 2011 PDF file
- UV calculators on the web
- Many reasons why vitamin D deficiency has become epidemic in past 30-40 yearsUK summers are not long enough to re-stock vitamin D – Aug 2010
2465 visitors, last modified 12 Nov, 2012,This page is in the following categories (# of items in each category)
Search For a Page