Risk-benefit analysis of mineral intakes:case studies on copper and iron

Fairweather-Tait, Susan J, Harvey, Linda J and Collings, Rachel (2011) Risk-benefit analysis of mineral intakes:case studies on copper and iron. Proceedings of the Nutrition Society, 70 (1). pp. 1-9. ISSN 0029-6651

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Abstract

Dietary reference values for essential trace elements are designed to meet requirements with minimal risk of deficiency and toxicity. Risk-benefit analysis requires data on habitual dietary intakes, an estimate of variation and effects of deficiency and excess on health. For some nutrients, the range between the upper and lower limits may be extremely narrow and even overlap, which creates difficulties when setting safety margins. A new approach for estimating optimal intakes, taking into account several health biomarkers, has been developed and applied to selenium, but at present there are insufficient data to extend this technique to other micronutrients. The existing methods for deriving reference values for Cu and Fe are described. For Cu, there are no sensitive biomarkers of status or health relating to marginal deficiency or toxicity, despite the well-characterised genetic disorders of Menkes and Wilson's disease which, if untreated, lead to lethal deficiency and overload, respectively. For Fe, the wide variation in bioavailability confounds the relationship between intake and status and complicates risk-benefit analysis. As with Cu, health effects associated with deficiency or toxicity are not easy to quantify, therefore status is the most accessible variable for risk-benefit analysis. Serum ferritin reflects Fe stores but is affected by infection/inflammation, and therefore additional biomarkers are generally employed to measure and assess Fe status. Characterising the relationship between health and dietary intake is problematic for both these trace elements due to the confounding effects of bioavailability, inadequate biomarkers of status and a lack of sensitive and specific biomarkers for health outcomes.

Item Type: Article
Uncontrolled Keywords: biological availability,biological markers,copper,humans,iron,nutritional requirements,nutritional status,reference values,risk assessment,trace elements
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Related URLs:
Depositing User: Rhiannon Harvey
Date Deposited: 17 Feb 2011 12:17
Last Modified: 21 Apr 2020 16:45
URI: https://ueaeprints.uea.ac.uk/id/eprint/21491
DOI: 10.1017/S0029665110003873

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