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Vitamin D Supplementation and Changes in Vitamin D and Bone Metabolites in Children

  • Richard D. LewisEmail author
  • Emma M. Laing
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Abstract

Because a significant number of children and adolescents worldwide are considered vitamin D insufficient or deficient, skeletal health may be compromised leading to long-term fracture risks. For this reason, a heightened research priority has been placed on the role of vitamin D in bone metabolism during growth. Vitamin D supplementation increases 25-­hydroxyvitamin D (25[OH]D) in children and the response appears to be dose-dependent, though dose–response trials are needed to confirm this. Increases in serum 1,25 dihydroxyvitamin D (1,25[OH]2D) and decreases in intact parathyroid hormone (iPTH) occur with vitamin D supplementation, and these responses are more pronounced with higher doses of vitamin D and in populations considered vitamin D insufficient and deficient (<50 nmol/L). In vitamin D-sufficient groups (>50 nmol/L), iPTH suppression is minimal. The effect of vitamin D supplementation on biochemical markers of bone turnover likely depends on basal 25(OH)D concentrations and doses of vitamin D administered, with lower baseline 25(OH)D and higher vitamin D doses promoting more favorable responses, respectively. Because there is a dearth of knowledge with respect to race differences in vitamin D and bone metabolism, dose–response trials among multiple race and ethnic groups are needed.

Keywords

Vitamin D Supplementation 25(OH)D 1,25(OH)2iPTH Bone turnover Children 

Abbreviations

25[OH]D

25-hydroxyvitamin D

1,25[OH]2D

1,25dihydroxyvitamin D

iPTH

Intact parathyroid ­hormone

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Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  1. 1.Department of Foods and NutritionThe University of GeorgiaAthensUSA

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