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Associations of diet, supplement use, and ultraviolet B radiation exposure with vitamin D status in Swedish women during winter
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences. (Ortopedi)
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2007 (English)In: American Journal of Clinical Nutrition, ISSN 0002-9165, E-ISSN 1938-3207, Vol. 86, no 5, 1399-1404 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Vitamin D is produced endogenously after sun exposure but can also be obtained from natural food sources, food fortification, and dietary supplements. OBJECTIVE: We aimed to determine the vitamin D status of women (61-86 y old) living in central Sweden (latitude 60 degrees ) during winter and its relation with vitamin D intake and exposure to ultraviolet B radiation. DESIGN: In a cross-sectional study, we assessed the vitamin D status (serum 25-hydroxyvitamin D [25(OH)D]) of 116 women by using an enzyme immunoassay. The women completed questionnaires covering food habits, use of dietary supplements, and sun-related behavior. RESULTS: In a multiple linear regression model, the main determinants of serum 25(OH)D concentrations (x +/- SD: 69 +/- 23 mmol/L) were dietary vitamin D (6.0 +/- 1.8 mug/d), travel to a sunny location during winter within the previous 6 mo (26%), and the use of dietary supplements (16%). There was no association between serum 25(OH)D status during the winter and age, time spent outdoors, the use of sunscreen, or skin type. Serum 25(OH)D concentrations increased by 25.5 nmol/L with 2-3 servings (130 g/wk) fatty fish/wk, by 6.2 nmol/L with the daily intake of 300 g vitamin D-fortified reduced-fat dairy products, by 11.0 nmol/L with regular use of vitamin D supplements, and by 14.5 nmol/L with a sun vacation during winter. Among nonsupplement users without a wintertime sun vacation, 2-3 servings fatty fish/wk increased serum vitamin D concentrations by 45%. CONCLUSION: Fatty fish, vitamin D-fortified reduced-fat dairy products, regular supplement use, and taking a sun vacation are important predictors for serum concentrations of 25(OH)D during winter at a latitude of 60 degrees .

Place, publisher, year, edition, pages
2007. Vol. 86, no 5, 1399-1404 p.
Keyword [en]
25(OH)D, 25-hydroxyvitamin D, Dietary Vitamin D, Ultraviolet B radiation exposure, Vitamin D fortification, Vitamin D intake, Vitamin D status, Vitamin D supplements
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-14805ISI: 000250936500021PubMedID: 17991652OAI: oai:DiVA.org:uu-14805DiVA: diva2:42576
Available from: 2008-01-31 Created: 2008-01-31 Last updated: 2011-01-18Bibliographically approved

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Michaëlsson, Karl
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