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Physiological requirements for iron in women of reproductive age assessed by the stable isotope tracer technique.

ABSTRACT: Background:Iron nutrition is important for the health of women of reproductive age, and defining the physiologic requirement for iron can help them accurately plan the iron intake. However, research on the physiologic requirement for iron in women is insufficient worldwide. This study aimed to further improve the methodology and get more precise data for the physiological requirements for iron in women of reproductive age on the basis of our previous study. Method:Sixty-one women of reproductive age who had not been pregnant before and during the whole study were included from Hebei province, China in 2015. Each subject participated in a 2-week metabolic trial with consuming 50?mg of the stable isotope 58Fe, and were then followed for ~?800?days. The abundance of 58Fe and the total iron concentration in the circulation were measured using multi-collector inductively-coupled plasma mass spectrometry and atomic absorption spectroscopy. The physiologic requirement for iron in women of reproductive age was then calculated. Results:The average iron circulation rate was 80.4%, and the steady period started from about 1?year. The average physiological requirement for iron of 21 subjects obtained by formula calculation was 1.55?mg/d and 23.63??g.kg-?1.d-?1 after adjustment for body mass, and that of 33 subjects obtained by linear regression was 1.29?mg/d, 20.98??g.kg-?1.d-?1 after adjustment for body mass. The results by two methods showed no significant difference. The EAR and RNI calculated from this results was 11-13?mg/d and 15-18?mg/d, respectively, both of which were slightly lower than the recommended value in Chinese Dietary Reference Intake (2013). Conclusion:The physiological requirements for iron in women of reproductive age were in accordance with other studies, while the EAR and RNI calculated from which were slightly lower than Chinese present recommended value. Trial registration:ChiCTR, ChiCTR-OCH-14004302. Registered 14 February 2014, http://www.chictr.org.cn/enindex.aspx.

SUBMITTER: Lu J

PROVIDER: S-EPMC6701013 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Physiological requirements for iron in women of reproductive age assessed by the stable isotope tracer technique.

Lu Jiaxi J Cai Jie J Ren Tongxiang T Wu Jinghuan J Mao Deqian D Li Weidong W Zhang Yu Y Piao Jianhua J Wang Jun J Yang Lichen L Yang Xiaoguang X Ma Yuxia Y

Nutrition & metabolism 20190819

<h4>Background</h4>Iron nutrition is important for the health of women of reproductive age, and defining the physiologic requirement for iron can help them accurately plan the iron intake. However, research on the physiologic requirement for iron in women is insufficient worldwide. This study aimed to further improve the methodology and get more precise data for the physiological requirements for iron in women of reproductive age on the basis of our previous study.<h4>Method</h4>Sixty-one women ...[more]

PMID: 31452667

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Project description:BackgroundKnowledge of the physiologic requirement for iron, the core index for the formulation of a dietary reference intake (DRI), is of great importance for the health of a pregnant woman and her fetus, and can help a mother accurately plan her iron supplementation. However, direct measurements of the physiologic requirement for iron during pregnancy are still lacking.MethodEleven women of reproductive age from Hebei Province, China, who planned to become pregnant in the near future, were enrolled between January and March 2015 and included in the final analysis. Subjects participated in a 2-week metabolic trial in which they consumed 50 mg of the stable isotope 58Fe, and were then followed for ~ 2 years. The abundance of 58Fe and the total iron concentration in the circulation were measured using Multi-collector Inductively-Coupled Plasma Mass Spectrometry and Atomic Absorption Spectroscopy, respectively. The physiologic requirement for iron during pregnancy was then calculated by the formula derived from our previously published work.ResultsThe mean physiologic requirement for iron in the 11 subjects, across their entire pregnancies, was 3.05 mg.d- 1 in total and 44.0 μg.kg- 1.d- 1 after adjustment for body mass. The physiologic requirements for iron in the first, second, and third trimesters were 2.04 mg.d- 1, 3.26 mg.d- 1, and 4.13 mg.d- 1, respectively. When adjusted for body mass, the physiologic requirements for iron in different trimesters were 32.3 μg.kg- 1.d- 1, 46.9 μg.kg- 1.d- 1, and 55.7 μg.kg- 1.d- 1, respectively.ConclusionWe preliminarily explored the physiologic requirement for iron in pregnant women. The data demonstrated that pregnant women needed about twice iron than non-pregnant women. This research may be helpful for the design of future studies and the modification of iron DRIs.Trial registrationChiCTR, ChiCTR-OCH-14004302. Registered 14 February 2014, http://www.chictr.org.cn/showproj.aspx?proj=5267.

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Physiological requirements for iron in women of reproductive age assessed by the stable isotope tracer technique.

Publications

Physiological requirements for iron in women of reproductive age assessed by the stable isotope tracer technique.

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