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Associations between dietary iron and zinc intakes, and between biochemical iron and zinc status in women

Lim, Karen, Booth, Alison, Szymlek-Gay, Ewa A., Gibson, Rosalind S., Bailey, Karl B., Irving, David, Nowson, Caryl and Riddell, Lynn 2015, Associations between dietary iron and zinc intakes, and between biochemical iron and zinc status in women, Nutrients, vol. 7, no. 4, pp. 2983-2999, doi: 10.3390/nu7042983.

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Title Associations between dietary iron and zinc intakes, and between biochemical iron and zinc status in women
Author(s) Lim, Karen
Booth, AlisonORCID iD for Booth, Alison orcid.org/0000-0003-4914-7006
Szymlek-Gay, Ewa A.ORCID iD for Szymlek-Gay, Ewa A. orcid.org/0000-0002-6533-7945
Gibson, Rosalind S.
Bailey, Karl B.
Irving, David
Nowson, CarylORCID iD for Nowson, Caryl orcid.org/0000-0001-6586-7965
Riddell, LynnORCID iD for Riddell, Lynn orcid.org/0000-0002-0688-2134
Journal name Nutrients
Volume number 7
Issue number 4
Start page 2983
End page 2999
Total pages 17
Publisher MDPI AG
Place of publication Basel, Switzerland
Publication date 2015-04-20
ISSN 2072-6643
Summary Iron and zinc are found in similar foods and absorption of both may be affected by food compounds, thus biochemical iron and zinc status may be related. This cross-sectional study aimed to: (1) describe dietary intakes and biochemical status of iron and zinc; (2) investigate associations between dietary iron and zinc intakes; and (3) investigate associations between biochemical iron and zinc status in a sample of premenopausal women aged 18–50 years who were recruited in Melbourne and Sydney, Australia. Usual dietary intakes were assessed using a 154-item food frequency questionnaire (n = 379). Iron status was assessed using serum ferritin and hemoglobin, zinc status using serum zinc (standardized to 08:00 collection), and presence of infection/inflammation using C-reactive protein (n = 326). Associations were explored using multiple regression and logistic regression. Mean (SD) iron and zinc intakes were 10.5 (3.5) mg/day and 9.3 (3.8) mg/day, respectively. Median (interquartile range) serum ferritin was 22 (12–38) μg/L and mean serum zinc concentrations (SD) were 12.6 (1.7) μmol/L in fasting samples and 11.8 (2.0) μmol/L in nonfasting samples. For each 1 mg/day increase in dietary iron intake, zinc intake increased by 0.4 mg/day. Each 1 μmol/L increase in serum zinc corresponded to a 6% increase in serum ferritin, however women with low serum zinc concentration (AM fasting < 10.7 μmol/L; AM nonfasting < 10.1 μmol/L) were not at increased risk of depleted iron stores (serum ferritin <15 μg/L; p = 0.340). Positive associations were observed between dietary iron and zinc intakes, and between iron and zinc status, however interpreting serum ferritin concentrations was not a useful proxy for estimating the likelihood of low serum zinc concentrations and women with depleted iron stores were not at increased risk of impaired zinc status in this cohort.
Language eng
DOI 10.3390/nu7042983
Field of Research 111199 Nutrition and Dietetics not elsewhere classified
Socio Economic Objective 920411 Nutrition
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, MDPI AG
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30072533

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.