J Obes Metab Syndr.
2017 Dec;26(4):274-280. 10.7570/jomes.2017.26.4.274.
Dietary Calcium Intake May Contribute to the HOMA-IR Score in Korean Females with Vitamin D Deficiency (2008–2012 Korea National Health and Nutrition Examination Survey)
- Affiliations
-
- 1Department of Family Practice and Community Health, Ajou University School of Medicine, Suwon, Korea. jchcmc@hanmail.net
- 2College of Biomedical and Health Sciences, Konkuk University, Chungju, Korea.
- 3CHA Anti-aging Institute, CHA University, Seoul, Korea.
- KMID: 2404809
- DOI: http://doi.org/10.7570/jomes.2017.26.4.274
Abstract
- BACKGROUND
Vitamin D and calcium are important factors involved in the regulation of blood glucose and insulin secretion. The Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) score is a useful variable for evaluating insulin resistance, and therefore we cross-sectionally compared HOMA-IR scores according to serum vitamin D levels and dietary calcium intake.
METHODS
We selected data from healthy males (n=5,163) and females (n=7,506) analyzed over 5 years (2008-2012) via the Korea National Health and Nutrition Examination Survey (KNHANES). We calculated HOMA-IR scores and compared them according to serum 25-hydroxyvitamin D (25(OH)D) concentration classification ( < 20, 20-30, >30 ng/mL) and dietary calcium quintile after adjustment for relevant variables using complex sample analysis. Comparisons were done after data weighting.
RESULTS
The mean dietary calcium intake in males and females was 558.1 mg/day and 445.9 mg/day, respectively. The mean serum 25(OH)D concentration in males and females was 19.4 ng/mL and 16.8 ng/mL, respectively. After adjustment for relevant variables, HOMA-IR score was significantly correlated with serum 25(OH)D concentration and dietary calcium intake in females, whereas it was only correlated with serum 25(OH)D concentration in males. HOMA-IR was significantly lower in the top quintile of dietary calcium intake (mean, 866 mg/day) within females with vitamin D deficiency (P=0.047).
CONCLUSION
Adequate dietary calcium intake may be important for normal HOMA-IR in females with vitamin D deficiency.
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