Abstract
Purpose
To assess the efficacy of different doses of vitamin D3 on serum 25-hydroxyvitamin D (25(OH)D), intact parathyroid hormone(iPTH), calcium, phosphorus, and alkaline phosphatase concentrations in overweight and obese school-children.
Methods
A total of 378 children and adolescents, 6–13 years of age, with age- and sex-specific body mass index(BMI) Z-score ≥ 1(according to the World Health Organization criteria) were allocated to receive 600, 1000, and 2000 IU vitamin D3/days. 25(OH)D, iPTH, calcium, phosphorus, and alkaline phosphatase concentrations were measured at baseline, 6, and 12 months. In this intention-to-treat analysis, we fitted a linear mixed effect model involving a random effect of participants within treatment groups and fixed effects of dose, time, and their interactions.
Results
Mean(SD) of age and BMI Z-score were 9.3 (1.7) years and 2.55 (0.73), respectively. The median (IQR) for 25(OH)D was 11.5 (8.9), 11.7 (10.5), 12.2 (10.2) ng/mL (28.75, 29.25, and 30.50 nmol/L) at baseline and 23.1 (8.0), 25.6 (8.3), 28.6 (10.4) ng/mL (57.75, 64.00, and 71.50 nmol/L) at the end of 12 months in 600, 1000, and 2000 IU, respectively (p values for dose, time, and the interaction being < 0.0001, < 0.0001,and 0.082, respectively). Prevalence of vitamin D deficiency (< 20 ng/mL) was 80.2, 77.5, and 75.5% in 600, 1000, and 2000 IU groups at baseline, respectively, which decreased to 34, 18.4, and 7.5%, respectively, at 12 months. Patterns of iPTH, calcium, phosphorus, and alkaline phosphatase response over time did not differ significantly among groups (p values = 0.452, 0.670, 0.377, 0.895, respectively).
Conclusions
Increases in 25(OH)D concentration were found with supplementation of 1000 and 2000 IU, compared with 600 IU/days, whereas there was no evidence of iPTH suppression or change in serum calcium, phosphorus, and alkaline phosphatase among children with excess weight.
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Acknowledgements
The authors would like to acknowledge Ms. Niloofar Shiva for critical editing of English grammar and syntax of the manuscript. We express our appreciation to the participants for their enthusiastic support, and the staff of the Research Institute for Endocrine Sciences, for their valuable help.
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GA, PM and FH conceptualized and designed the study, drafted the initial manuscript, and reviewed and revised the manuscript. EY collected data, carried out the initial analyses, and reviewed and revised the manuscript. CLW interpreted the results and drafted the initial manuscript. YP carried out the analyses and critically reviewed the manuscript. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.
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Supplementary Figure 1
Main effects of supplementation with vitamin D on serum 25(OH)D, PTH, 25(OH)D: PTH ratio, calcium, phosphorus, and alkaline phosphatase in the per-protocol analysis. Supplementary Figure 2 Main effects of supplementation with vitamin D on serum 25(OH)D across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. Supplementary Figure 3 Main effects of supplementation with vitamin D on serum PTH across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. Supplementary Figure 4 Main effects of supplementation with vitamin D on serum 25(OH)D: PTH ratio across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. Supplementary Figure 5 Main effects of supplementation with vitamin D on serum calcium across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. Supplementary Figure 6 Main effects of supplementation with vitamin D on serum phosphorus across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. Supplementary Figure 7 Main effects of supplementation with vitamin D on serum alkaline phosphatase across subgroups of sex, obesity status, and puberty maturation in the intention-to-treat analysis. (DOCX 1508 kb)
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Asghari, G., Yuzbashian, E., Wagner, C.L. et al. Daily vitamin D3 in overweight and obese children and adolescents: a randomized controlled trial. Eur J Nutr 60, 2831–2840 (2021). https://doi.org/10.1007/s00394-020-02406-x
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DOI: https://doi.org/10.1007/s00394-020-02406-x