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- Title
Association of plasma vitamin D levels with adiposity in Hispanic and African Americans.
- Authors
Young, Kendra A; Engelman, Corinne D; Langefeld, Carl D; Hairston, Kristen G; Haffner, Steven M; Bryer-Ash, Michael; Norris, Jill M
- Abstract
<bold>Context: </bold>Previous studies have suggested vitamin D insufficiency is associated with increased obesity; however, the relationship between 25-hydroxyvitamin D (25[OH]D) and 1,25-dihydroxyvitamin D (1,25[OH](2)D) and measures of adiposity has not been well characterized in minority populations.<bold>Objective: </bold>The objective of the study was to examine the relationship between levels of 25[OH]D and 1,25[OH](2)D and measures of adiposity in Hispanic and African-Americans at baseline and on change in these measures over time.<bold>Design and Setting: </bold>The Insulin Resistance Atherosclerosis (IRAS) Family Study examined 917 Hispanics and 439 African-Americans at baseline and again 5.3 yr later (n = 1081 at follow-up).<bold>Main Outcome Measure: </bold>25[OH]D (nanograms per milliliter) and 1,25[OH](2)D (picograms per milliliter) were measured at baseline. Abdominal sc adipose tissue (SAT), visceral adipose tissue (VAT; both determined by computed tomography scan), and body mass index (BMI) were measured at baseline and follow-up.<bold>Results: </bold>25[OH]D was inversely associated with BMI, VAT, and SAT in both populations at baseline (P < 0.001). 25[OH]D was marginally inversely associated with baseline visceral fat to sc fat ratio in African-Americans (P = 0.049) but not Hispanics. 1,25[OH](2)D was inversely associated with BMI (P < 0.0001, P = 0.002) and VAT (P = 0.0005, P = 0.012) in Hispanics and African-Americans, respectively, whereas 1,25[OH](2)D was inversely associated with SAT in Hispanics (P < 0.0001) and with visceral fat to sc fat ratio in African-Americans (P = 0.02). Adjusting for 25[OH]D attenuated these associations; 1,25[OH](2)D remained associated with BMI in both populations (P < 0.05) and with SAT (P = 0.004) in Hispanics. No significant associations between 5-yr change in adiposity and 25[OH]D or 1,25[OH](2)D were seen.<bold>Conclusions: </bold>Vitamin D levels were inversely associated with baseline BMI, SAT, and VAT in Hispanic and African-Americans but were not associated with 5-yr change in adiposity.
- Subjects
ADIPOSE tissues; BLACK people; HUMAN body composition; COMPARATIVE studies; HISPANIC Americans; LONGITUDINAL method; RESEARCH methodology; MEDICAL cooperation; RESEARCH; RESEARCH funding; VITAMIN D; EVALUATION research; BODY mass index; ABDOMINAL adipose tissue
- Publication
Journal of Clinical Endocrinology & Metabolism, 2009, Vol 94, Issue 9, p3306
- ISSN
0021-972X
- Publication type
journal article
- DOI
10.1210/jc.2009-0079