Endocrinology and Metabolism

Original Article

Obesity and Metabolism
Adiposity in the Relationship between Serum Vitamin D Level and Insulin Resistance in Middle-Aged and Elderly Korean Adults: The Korea National Health and Nutrition Examination Survey 2008: Ji Hyun Kang, Sang Soo Kim, Seung Su Moon, Won Jin Kim, Min Jung Bae, Bo Gwang Choi, Yun Kyung Jeon, Bo Hyun Kim, Yong Ki Kim, In Joo Kim; Endocrinol Metab. 2013;28(2):96-102. Published online June 18, 2013; DOI: https://doi.org/10.3803/EnM.2013.28.2.96

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Background

The role of adiposity in the relationship between serum vitamin D levels and insulin resistance has not yet been fully studied. This aim of this study is to clarify the role of adiposity in the relationship between serum vitamin D level and insulin resistance among middle-aged and elderly Korean adults.

Methods

We used data from 2,710 individuals aged ≥50 years based on national data from a representative sample of the fourth Korea National Health and Nutrition Examination Survey IV-2 in 2008.

Results

After adjustment for potential confounders, body mass index (BMI) was significantly associated with 25(OH) vitamin D (P=0.008). However, waist circumference was not significantly associated with 25(OH) vitamin D. In the stratified analyses, 25(OH) vitamin D was found to be negatively associated with fasting insulin and homeostasis model assessment estimate of insulin resistance (HOMA-IR) in participants with BMIs ≥25 kg/m² (P=0.003 for both insulin and HOMR-IR) but was not found to be associated in those with BMIs <23 kg/m². However, we observed a significant inverse in the association of 25(OH) vitamin D with fasting insulin and HOMA-IR in both the normal (P=0.001 and P<0.001 and the abdominally obese group (P=0.010 and P=0.009) in the stratified analyses according to abdominal obesity.

Conclusion

Our results support that the idea that endogenously-produced vitamin D might be stored in subcutaneous fat deposits. In addition, the association of vitamin D with insulin resistance in middle-aged and elderly Korean adults was stronger when it was stratified by BMI than when abdominal obesity status.

Citations

Citations to this article as recorded by

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