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Cross-Sectional and Prospective Cohort Study of Serum 25-Hydroxyvitamin D Level and Obesity in Adults

Mai, Xiao-Mei; Chen, Yue; Camargo, Carlos Arthuro; Langhammer, Arnulf
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2445685
Date
2012
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  • Institutt for samfunnsmedisin og sykepleie [1769]
  • Publikasjoner fra CRIStin - NTNU [21016]
Original version
American Journal of Epidemiology. 2012, 175 (10), 1029-1036.   10.1093/aje/kwr456
Abstract
Experimental studies suggest that vitamin D modulates the activity of adipocytes. The authors examined baseline serum 25-hydroxyvitamin D (25(OH)D) level in relation to prevalent and cumulative incident obesity in Norway. A cohort of 25,616 adults aged 19–55 years participated in both the second and third surveys of the Nord-Trøndelag Health Study (HUNT 2 (1995–1997) and HUNT 3 (2006–2008)). Serum 25(OH)D levels measured at baseline and anthropometric measurements taken at both baseline and follow-up were available for a random sample of 2,460 subjects. Overall, 40% of the 2,460 subjects had a serum 25(OH)D level less than 50.0 nmol/L, and 37% had a level of 50.0–74.9 nmol/L. The prevalence and cumulative incidence of obesity, defined as body mass index (weight (kg)/height (m)2) ≥30, were 12% and 15%, respectively. Lower serum 25(OH)D level was associated with a higher prevalence of obesity. In the 2,165 subjects with baseline BMI less than 30, a serum 25(OH)D level less than 50.0 nmol/L was associated with a significantly increased odds ratio for incident obesity during follow-up (adjusted odds ratio = 1.73, 95% confidence interval: 1.24, 2.41). When prevalent and incident obesity were classified according to waist circumference (≥88 cm for women, ≥102 cm for men), similar results were obtained. In addition to prevalent obesity, a serum 25(OH)D level less than 50.0 nmol/L was significantly associated with new-onset obesity in adults.
Publisher
Oxford University Press
Journal
American Journal of Epidemiology

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