Vitamin D status and glucose homeostasis in the 1958 British birth cohort -: The role of obesity

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 HbA(1c) (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-l 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 >= 30 kg/m(2)) 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 or 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/m(2) -0.25(-0.37 to -0.13) for BMI 25-29.9 kg/m(2), -0.65 (-0.95 to -0.34) for BMI 30-34.9 kg/m(2), and -1.37 (-2.09 to -0.64) for BMI >= 35 kg/m(2). 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.