Vitamin D in adolescence: evidence-based dietary requirements and implications for public health policy

Smith, Taryn, Tripkovic, Laura, Lanham-New, Susan and Hart, Kathryn (2017) Vitamin D in adolescence: evidence-based dietary requirements and implications for public health policy Proceedings of the Nutrition Society., 77 (3). pp. 292-301.

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Abstract

Vitamin D is a unique nutrient. Firstly, it acts as a pro-hormone and secondly, the requirement for vitamin D can be met by both endogenous synthesis from sunlight and by dietary sources. This complicates the determination of dietary requirements for vitamin D, which along with the definition of optimal vitamin D status, have been highly controversial and much debated over recent years. Adolescents are a population group at high risk of low vitamin D status, which is concerning given the important role of vitamin D, and calcium, in promoting normal bone mineralisation and attainment of peak bone mass during this rapid growth phase. Dietary vitamin D recommendations are important from a public health perspective in helping to avoid deficiency and optimise vitamin D status for health. However limited experimental data from winter-based dose-response randomised trials in adolescents has hindered the development of evidence-based dietary requirements for vitamin D in this population group. This review will highlight how specifically designed randomised trials and the approach adopted for estimating such requirements can lead to improved recommendations. Such data indicates that vitamin D intakes of between 10 and ~30 µg/day may be required to avoid deficiency and ensure adequacy in adolescents, considerably greater than the current recommendations of 10-15 µg/day. Finally this review will consider the implications of this on public health policy, in terms of future refinements of vitamin D requirement recommendations and prioritisation of public health strategies to help prevent vitamin D deficiency

Item Type:	Article
Divisions :	Faculty of Health and Medical Sciences > School of Biosciences and Medicine
Authors :	Name Email ORCID Smith, Taryn t.j.smith@surrey.ac.uk Tripkovic, Laura Laura.Tripkovic@surrey.ac.uk Lanham-New, Susan S.Lanham-New@surrey.ac.uk Hart, Kathryn K.Hart@surrey.ac.uk
Date :	4 December 2017
DOI :	10.1017/S0029665117004104
Copyright Disclaimer :	Copyright 2017 Cambridge University Press. This article has been accepted for publication and will appear in the Proceedings of the Nutrition Society, published by Cambridge University Press.
Uncontrolled Keywords :	vitamin D, 25-hydroxyvitamin D, adolescence, dietary requirements
Depositing User :	Melanie Hughes
Date Deposited :	04 Jan 2018 10:27
Last Modified :	23 Oct 2018 15:05
URI:	http://epubs.surrey.ac.uk/id/eprint/845528

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