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Comparison of breast-milk iodine concentration of lactating women in Australia pre and post mandatory iodine fortification

Huynh, Dao, Condo, Dominique, Gibson, Robert, Makrides, Maria, Muhlhausler, Beverly and Zhou, Shao Jia 2017, Comparison of breast-milk iodine concentration of lactating women in Australia pre and post mandatory iodine fortification, Public Health Nutrition, vol. 20, no. 1, pp. 12-17, doi: 10.1017/s1368980016002032.

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Title Comparison of breast-milk iodine concentration of lactating women in Australia pre and post mandatory iodine fortification
Author(s) Huynh, Dao
Condo, DominiqueORCID iD for Condo, Dominique orcid.org/0000-0002-8348-7488
Gibson, Robert
Makrides, Maria
Muhlhausler, Beverly
Zhou, Shao Jia
Journal name Public Health Nutrition
Volume number 20
Issue number 1
Start page 12
End page 17
Total pages 6
Publisher Cambridge University Press (CUP)
Place of publication Cambridge, Eng.
Publication date 2017-01
ISSN 1368-9800
1475-2727
Keyword(s) Breast milk
Iodine
Fortification
Summary Objective: To compare the breast-milk iodine concentrations (BMIC) of lactating women before and after the mandatory iodine fortification of bread in Australia in 2009.Design: Cross-sectional study. Breast milk samples were collected from two cohorts of women in South Australia within 7 d of delivery to determine BMIC. The percentage of samples with iodine concentration below 100 μg/l, a level considered adequate for breast-fed infants, was calculated. Sociodemographic information and intake of dietary supplements were obtained from all women.Setting: The breast milk samples were collected between 2006 and 2007 in the pre-fortification cohort and between 2012 and 2013 in the post fortification cohort.Results: The median (interquartile range) BMIC was higher in the post-fortification samples compared with samples collected in the pre-fortification period (187 (130–276) v. 103 (73–156) μg/l; P<0·05). Overall, the percentage of women with BMIC <100 μg/l was lower in the post-fortification cohort than in the pre-fortification cohort (13 v. 49 %; P<0·01). The percentage of women with BMIC <100 μg/l in the post-fortification cohort was lower among women who took iodine supplements in pregnancy (12 v. 29%; P <0·01).Conclusions: Mandatory iodine fortification of bread has resulted in an increase in the iodine content of breast milk in Australian women. However, iodine supplementation may still be required in some women post-iodine fortification to reach the level of BMIC that is considered adequate to meet the iodine requirement of full-term infants.
Language eng
DOI 10.1017/s1368980016002032
Indigenous content off
Field of Research 111104 Public Nutrition Intervention
11 Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30140852

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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.