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Low Vitamin D Status and Adolescent Bone Health While a considerable amount of research is available assessing vitamin D deficiency on health measures in adults and elderly subjects, less is known about the effect of subclinical vitamin D status on adolescent boys and girls, particularly with regard to its influence on bone health. In this study researchers sought to assess possible relations between stages of vitamin D status, bone mineral density (BMD) and bone turnover among a representative sample of adolescents in Northern Ireland. They note that in elderly subjects low vitamin D elevates parathyroid hormone (PTH) which, in turn, contributes to bone turnover and bone loss. However, PTH is known to be high during adolescence, suggesting other mechanisms may be in play to account for the limited data showing a possible adverse correlation between low vitamin D and bone mineral acquisition in teen girls. No such study has been conducted on teen boys. Researchers assessed vitamin D status and bone health indexes in a population of 1015 adolescents from The Young Hearts 2000 survey; 12-(n = 260) and 15-y-old (n = 239) boys and 12- (n = 266) and 15-y-old (n = 250) girls. Data was taken on a pubertal status, BMD (forearm and heels), physical activity, nutrition and anthropometry. Blood samples were taken for serum 25-hydroxyvitamin D (25(OH)D), PTH, osteocalcin, and type I collagen corss-linked C-telepeptide. Multivariate regression was used to adjust for numerous possible confounding factors. The findings of this study showed that both 12- and 15-y-old girls with high vitamin D status had significantly higher forearm BMD and lower PTH concentrations and other bone turnover markers than did girls with lower vitamin D status. In boys a similar association between vitamin D status and serum PTH was observed, though no significant relation between vitamin D and BMD was noted. Cashman et al speculate that the higher BMD in girls with greater vitamin D status is due to the lower serum PTH levels and lower bone markers. Though no consensus on ideal serum 25(OH)D concentrations exists, researchers suggest an agreed level such as >= 50nmol/L may serve as low cost means to improve bone health in adolescents. Study: Cashman, K, D.,et al, Am J Clin Nutr 87: 1039-44 (2008) RETURN from vitamin d and adolescent bone health |
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