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American Journal of Clinical Nutrition, Vol. 87, No. 4, 839-845, April 2008
© 2008 American Society for Nutrition

ORIGINAL RESEARCH COMMUNICATION

Predictors of iron status in well-nourished 4-y-old children1,2,3

Inger Öhlund, Torbjörn Lind, Agneta Hörnell and Olle Hernell

1 From the Department of Food and Nutrition (IÖ and AH) and the Division of Pediatrics, Department of Clinical Sciences (IÖ, TL, and OH), Umeå University, Umeå, Sweden

Background: Iron status in childhood is influenced by diet. Other factors affecting iron status at that age are unclear.

Objectives: The objectives of the study were to evaluate iron status in 4-y-old children, to track that status from infancy to childhood, and to examine the associations of iron status with dietary factors, growth, and heredity.

Design: This study consisted of a longitudinal follow-up at age 4 y of children (n = 127) from the cohort of a study that began at age 6 mo. Blood samples and anthropometry were assessed in both children and their parents; food records were collected from children only.

Results: Dietary intake was not significantly correlated with hemoglobin concentrations, whereas the consumption of meat products had a positive effect on serum ferritin concentrations and mean corpuscular volume in boys (P = 0.015 and 0.04, respectively). The prevalences of anemia and iron deficiency were low, affecting 2 (1.8%) and 3 (2.8%) children, respectively; no child had iron deficiency anemia. There was significant within-subject tracking of hemoglobin and mean corpuscular volume from age 6 mo to 4 y. The mother's but not the father's hemoglobin correlated with the child's hemoglobin over time.

Conclusions: Food choices had little effect on iron status. Hemoglobin concentrations and mean corpuscular volume were tracked from infancy to childhood. In healthy, well-nourished children with a low prevalence of iron deficiency, the mother's hemoglobin was significantly associated with that of her child, but the underlying mechanism is unclear.






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