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Gender-related differences in iron absorption by preadolescent children
J C Woodhead1, J M Drulis, S E Nelson
1Department of Pediatrics, College of Medicine, University of Iowa, Iowa City 52242.
Pediatric Research
|May 1, 1991
Summary
Girls aged Tanner stage 1 showed significantly higher iron absorption than boys, irrespective of meal content. This gender difference in iron uptake is not explained by body iron stores, suggesting hormonal influences.
Area of Science:
- Pediatric Nutrition
- Human Physiology
- Biochemistry
Background:
- Previous observations suggested potential gender differences in iron absorption among preadolescent children.
- Preadolescent children (Tanner stage 1) were the focus due to their distinct developmental stage.
Purpose of the Study:
- To investigate and quantify gender-related differences in iron absorption in preadolescent children.
- To explore potential factors, such as body iron stores, influencing these differences.
Main Methods:
- Two studies (A and B) were conducted using iron-58 (58Fe) as a stable isotope tracer.
- Study A involved administering ferrous sulfate with ascorbic acid to fasted children; Study B involved administering 58Fe-labeled breakfast.
- Erythrocyte incorporation of 58Fe was measured using inductively coupled plasma mass spectrometry.
Main Results:
- Girls demonstrated significantly higher erythrocyte incorporation of 58Fe compared to boys in both studies (Study A: 45.0% vs 35.2%; Study B: 24.7% vs 14.8%).
- These differences remained significant after adjusting for serum ferritin levels, indicating they are not solely due to variations in body iron stores.
- Serum ferritin concentrations were similar between genders, ruling out body iron stores as the primary explanation.
Conclusions:
- Preadolescent girls exhibit enhanced iron absorption compared to boys.
- Hormonal differences between genders in Tanner stage 1 are hypothesized to be the underlying factor driving this observed difference in iron absorption.
- Further research into hormonal influences on iron metabolism in this age group is warranted.