Vitamin D status and glucose homeostasis in the 1958 British birth cohort: the role of obesity - PubMed (original) (raw)
. 2006 Oct;29(10):2244-6.
doi: 10.2337/dc06-0946.
Affiliations
- PMID: 17003300
- DOI: 10.2337/dc06-0946
Vitamin D status and glucose homeostasis in the 1958 British birth cohort: the role of obesity
Elina Hyppönen et al. Diabetes Care. 2006 Oct.
Abstract
Objective: Obesity is a well-known risk factor for vitamin D deficiency. We evaluated the interrelationship between vitamin D status, body size, and glucose homeostasis, measured by HbA1c (A1C).
Research design and methods: Data are from the survey of the 45-year-old 1958 British birth cohort (2002-2004). Information on A1C, 25-hydroxyvitamin D [25(OH)D; an indicator of vitamin D status], and BMI was collected from 7,198 Caucasian subjects.
Results: 25(OH)D was < 75 nmol/l in 80% of the obese subjects (BMI > or = 30 kg/m2) versus 68% of the other subjects (P < 0.0001). Serum 25(OH)D decreased and A1C increased by increasing BMI (P < 0.0001 for both comparisons). There was a nonlinear association between 25(OH)D and A1C: a steep linear decrease in A1C by 25(OH)D until 65 nmol/l and only smaller decreases with further increases. There was evidence for effect modification by BMI in the association between 25(OH)D and A1C (P < 0.0001), and differences appeared stronger for participants with higher compared with lower BMIs. After adjustment for sex, season, geographical location, physical activity, and social class, percent change in A1C by 10-nmol/l increase in 25(OH)D was -0.21 (95% CI -0.31 to -0.11) for BMI < 25 kg/m2, -0.25 (-0.37 to -0.13) for BMI 25-29.9 kg/m2, -0.65 (-0.95 to -0.34) for BMI 30-34.9 kg/m2, and -1.37 (-2.09 to -0.64) for BMI > or = 35 kg/m2.
Conclusions: Body size was a strong determinant for 25(OH)D, with concentrations being suboptimal in most obese participants. Randomized controlled trials [using dosages sufficient to improve 25(OH)D also for the obese] are required to determine whether clinically relevant improvements in glucose metabolism can be obtained by vitamin D supplementation.
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