Chiao-Yu Huang1, Hao-Hsiang Chang1, Chia-Wen Lu1, Fen-Yu Tseng2, Long-Teng Lee1, Kuo-Chin Huang3. 1. Department of Family Medicine, National Taiwan University Hospital, Taipei, Taiwan. 2. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan. 3. Department of Family Medicine, National Taiwan University Hospital, Taipei, Taiwan; Department of Family Medicine, College of Medicine, National Taiwan University, Taiwan; Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan. Electronic address: bretthuang@ntu.edu.tw.
Abstract
BACKGROUND AND AIMS: Low vitamin D status has been linked to obesity, insulin resistance, and metabolic syndrome. In the present study, we aimed to explore the nature and strength of the relationship between vitamin D and metabolic syndrome among non-diabetic young adults. METHODS: This was a campus-based cross-sectional study of 355 non-diabetic young adult graduate students (233 males and 132 females; mean age, 23.5 ± 2.4 years) in Northern Taiwan. We measured and tested the association of serum 25-hydroxyvitamin D levels with metabolic syndrome and cardio-metabolic parameters. RESULTS: A total of 24 (6.8%) recruited young adults had metabolic syndrome. There were decreasing trends of body mass index (BMI), Homeostasis Model of Assessment-Insulin Resistance (HOMA-IR) and prevalence of metabolic syndrome across increasing tertiles of vitamin D levels irrespective of age and sex (P for trend <0.05). Without adjusting for BMI or HOMA-IR, the odds of having metabolic syndrome decreased across increasing tertiles of vitamin D levels (P for trend 0.021). The odds ratio of having metabolic syndrome was 0.26 (95% confidence interval: 0.08-0.85, P = 0.025) for the highest vs. the lowest tertile of vitamin D levels. However, further adjustments for BMI and HOMA-IR largely removed the inverse association of vitamin D status with metabolic syndrome and its individual components. CONCLUSION: Among non-diabetic young adults, the potential inverse relationship between vitamin D status and metabolic syndrome may be attributable to the conjunctive effects of individual obesity and insulin resistance.
BACKGROUND AND AIMS: Low vitamin D status has been linked to obesity, insulin resistance, and metabolic syndrome. In the present study, we aimed to explore the nature and strength of the relationship between vitamin D and metabolic syndrome among non-diabetic young adults. METHODS: This was a campus-based cross-sectional study of 355 non-diabetic young adult graduate students (233 males and 132 females; mean age, 23.5 ± 2.4 years) in Northern Taiwan. We measured and tested the association of serum 25-hydroxyvitamin D levels with metabolic syndrome and cardio-metabolic parameters. RESULTS: A total of 24 (6.8%) recruited young adults had metabolic syndrome. There were decreasing trends of body mass index (BMI), Homeostasis Model of Assessment-Insulin Resistance (HOMA-IR) and prevalence of metabolic syndrome across increasing tertiles of vitamin D levels irrespective of age and sex (P for trend <0.05). Without adjusting for BMI or HOMA-IR, the odds of having metabolic syndrome decreased across increasing tertiles of vitamin D levels (P for trend 0.021). The odds ratio of having metabolic syndrome was 0.26 (95% confidence interval: 0.08-0.85, P = 0.025) for the highest vs. the lowest tertile of vitamin D levels. However, further adjustments for BMI and HOMA-IR largely removed the inverse association of vitamin D status with metabolic syndrome and its individual components. CONCLUSION: Among non-diabetic young adults, the potential inverse relationship between vitamin D status and metabolic syndrome may be attributable to the conjunctive effects of individual obesity and insulin resistance.