Abstract
Although evidence suggests that hair elements may reflect dietary habits and/or mineral intake, this topic remains controversial. This study therefore presents age-specific reference values for hair concentrations of Ca, Cu, Fe, Na, Mg, P and Zn using the LMS method of Cole, and investigates the relationship between dietary habits (i.e. food consumption frequencies) and hair mineral concentrations in 218 Belgian elementary school girls by reduced rank regression (RRR). Hair minerals were quantitatively determined via inductively coupled plasma–mass spectrometry after microwave-assisted acid digestion of 6-cm long vertex posterior hair samples. The Children’s Eating Habits Questionnaire—Food Frequency Questionnaire was used to obtain information on food consumption frequency of 43 food items in the month preceding hair collection. The established reference ranges were in line with data for other childhood or adolescent populations. The retained RRR factors explained 40, 50, 45, 46, 44 and 48 % of the variation of Ca, Cu, Fe, Mg, P and Zn concentrations in hair, respectively. Although this study demonstrated that a large proportion of hair mineral variation may be influenced by food consumption frequencies in elementary school girls, a number of food groups known to be rich sources of minerals did not show a relation with certain hair minerals. Future research should focus on mechanisms and processes involved in mineral incorporation and accumulation in scalp hair, in order to fully understand the importance and influence of diet on hair minerals.
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Acknowledgements
The project was financed by the European Community within the Sixth RTD Framework Program contract no. 016181 (FOOD) and the research council of Ghent University (Bijzonder Onderzoeksfonds). Barbara Vanaelst, Tineke De Vriendt, Krishna Vyncke, Isabelle Sioen, Lieve Balcaen and Maite Aramendia are financially supported by the Research Foundation—Flanders (grant no.: 1.1.894.11.N.00, 1.1.746.09.N.01, 1.1.905.10.N.00, 1.2.683.11.N.00, 1.2.031.09.N.01 and 1.2.031.09.N.01, respectively). Nathalie Michels is financially supported by the research council of Ghent University (Bijzonder onderzoeksfonds). María R. Flórez is financially supported by Gent University (project BOF 01SB0309) and the Spanish Ministry of Economy and Competitiveness (project CTQ2009-08606). The authors wish to thank the ChiBS children and their parents who generously volunteered and participated in this project.
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Atomic and mass spectrometry (A&MS) research unit, Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000 Ghent http://www.analchem.ugent.be/A&MS/
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Vanaelst, B., Huybrechts, I., Michels, N. et al. Mineral Concentrations in Hair of Belgian Elementary School Girls: Reference Values and Relationship with Food Consumption Frequencies. Biol Trace Elem Res 150, 56–67 (2012). https://doi.org/10.1007/s12011-012-9495-5
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DOI: https://doi.org/10.1007/s12011-012-9495-5