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Background and Objective. Association of vitamin D (25-hydroxyvitamin-D; 25(OH)D), with glucose metabolism is ethnic dependent. We study the relation of vitamin D and its metabolites with the glycemic profile of obese women. Patients and Methods. Informed consent and demographic information was collected from obese ( BMI ≥ 30 kg / m 2 ) and nonobese women. A blood sample in fasting was obtained and analyzed for fasting glucose, fasting insulin, serum 25(OH)D, serum parathyroid hormone (PTH), and calcium levels. Insulin resistance (IR), detected by Matthews’ method (1985), was considered in women with HOMA − IR ≥ 2.5 . Vitamin D concentrations < 12 ng / ml were considered vitamin D deficiency. Results. A total of 264 obese and 133 normal BMI women (controls) of age range 20-50 years were selected. Obese women had significantly lower vitamin D compared to control women ( P < 0.05 ). Among euglycemic ( fasting glucose < 100 mg / dl ) obese women ( n = 221 ), 90 (40.7%) were vitamin D deficient. Serum PTH and calcium levels were negatively correlated, though nonsignificantly with vitamin D ( r = − 0.172 , P = 0.090 , and r = − 0.051 , P = 0.557 , respectively). The mean age, BMI, waist circumference (WC), hip circumference (HC), waist-to-hip ratio (WHR), fasting glucose, fasting insulin, PTH, and calcium were not significantly different in vitamin D-deficient as compared to nondeficient obese women. IR was detected in 109 (49.3%) obese women. Mean HOMA-IR in vitamin D-deficient women was significantly higher than that in the nondeficient obese women ( 3.03 ± 1.64 vs. 2.40 ± 1.02 ; P = 0.041 ), but the percentage of women with IR was comparable in both groups (51.1% vs. 45.8%; P = 0.745 ). Univariate analysis revealed that HOMA-IR was negatively correlated with vitamin D and positively with BMI and PTH. A multivariate regression analysis, stepwise method revealed that BMI and PTH were independent determinants of HOMA-IR instead of vitamin D. Conclusion. More than 40% of obese women were vitamin D deficient. Among euglycemic obese women, 49% were insulin resistant. Prevalence of insulin resistance, though negatively correlated with vitamin D, could be better explained by BMI and PTH levels.
Background and Objective. Association of vitamin D (25-hydroxyvitamin-D; 25(OH)D), with glucose metabolism is ethnic dependent. We study the relation of vitamin D and its metabolites with the glycemic profile of obese women. Patients and Methods. Informed consent and demographic information was collected from obese ( BMI ≥ 30 kg / m 2 ) and nonobese women. A blood sample in fasting was obtained and analyzed for fasting glucose, fasting insulin, serum 25(OH)D, serum parathyroid hormone (PTH), and calcium levels. Insulin resistance (IR), detected by Matthews’ method (1985), was considered in women with HOMA − IR ≥ 2.5 . Vitamin D concentrations < 12 ng / ml were considered vitamin D deficiency. Results. A total of 264 obese and 133 normal BMI women (controls) of age range 20-50 years were selected. Obese women had significantly lower vitamin D compared to control women ( P < 0.05 ). Among euglycemic ( fasting glucose < 100 mg / dl ) obese women ( n = 221 ), 90 (40.7%) were vitamin D deficient. Serum PTH and calcium levels were negatively correlated, though nonsignificantly with vitamin D ( r = − 0.172 , P = 0.090 , and r = − 0.051 , P = 0.557 , respectively). The mean age, BMI, waist circumference (WC), hip circumference (HC), waist-to-hip ratio (WHR), fasting glucose, fasting insulin, PTH, and calcium were not significantly different in vitamin D-deficient as compared to nondeficient obese women. IR was detected in 109 (49.3%) obese women. Mean HOMA-IR in vitamin D-deficient women was significantly higher than that in the nondeficient obese women ( 3.03 ± 1.64 vs. 2.40 ± 1.02 ; P = 0.041 ), but the percentage of women with IR was comparable in both groups (51.1% vs. 45.8%; P = 0.745 ). Univariate analysis revealed that HOMA-IR was negatively correlated with vitamin D and positively with BMI and PTH. A multivariate regression analysis, stepwise method revealed that BMI and PTH were independent determinants of HOMA-IR instead of vitamin D. Conclusion. More than 40% of obese women were vitamin D deficient. Among euglycemic obese women, 49% were insulin resistant. Prevalence of insulin resistance, though negatively correlated with vitamin D, could be better explained by BMI and PTH levels.
Background: Vitamin D deficiency is recognized as a general health condition globally and is acknowledged as a public health concern in Europe. In Romania, a national program of examination of the status of vitamin D for high-risk groups has demonstrated a vitamin D deficiency prevalence of 39.83%. No national data on the status of vitamin D in the general adult population are available to date. Methods: We used the framework of the European Health Examination Survey to analyze vitamin D levels in a sample population of adults aged 25–64 years, from 120 family doctors’ patients lists, by using a sequential sampling method. Data were weighted to the Romanian population. Vitamin D deficiency was defined as 25(OH)D < 20 ng/mL. Results: In total, 5380 adults aged 25–64 years were included in this study. The overall prevalence of vitamin D deficiency is 24.8%. Predictors of vitamin D deficiency were found to be obesity, female sex, living in rural areas, lower education level, and lower socioeconomic status. Conclusions: Specific recommendations for vitamin D screening and supplementation should be issued for women by specialist boards. Further studies are needed to identify seasonal variation and to establish a correlation with nutritional surveys.
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