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Dietary Iron Bioavailability: Agreement between Estimation Methods and Association with Serum Ferritin Concentrations in Women of Childbearing Age

1
Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo 05508-000, Brazil
2
Center for Biological and Health Sciences, Mackenzie Presbyterian University, Sao Paulo 01302-907, Brazil
3
Department of Nutrition, Faculty of Public Health, University of Sao Paulo, Sao Paulo 01246-904, Brazil
*
Author to whom correspondence should be addressed.
Nutrients 2018, 10(5), 650; https://doi.org/10.3390/nu10050650
Received: 7 April 2018 / Revised: 2 May 2018 / Accepted: 4 May 2018 / Published: 21 May 2018
Predictive iron bioavailability (FeBio) methods aimed at evaluating the association between diet and body iron have been proposed, but few studies explored their validity and practical usefulness in epidemiological studies. In this cross-sectional study involving 127 women (18–42 years) with presumably steady-state body iron balance, correlations were checked among various FeBio estimates (probabilistic approach and meal-based and diet-based algorithms) and serum ferritin (SF) concentrations. Iron deficiency was defined as SF < 15 µg/L. Pearson correlation, Friedman test, and linear regression were employed. Iron intake and prevalence of iron deficiency were 10.9 mg/day and 12.6%. Algorithm estimates were strongly correlated (0.69≤ r ≥0.85; p < 0.001), although diet-based models (8.5–8.9%) diverged from meal-based models (11.6–12.8%; p < 0.001). Still, all algorithms underestimated the probabilistic approach (17.2%). No significant association was found between SF and FeBio from Monsen (1978), Reddy (2000), and Armah (2013) algorithms. Nevertheless, there was a 30–37% difference in SF concentrations between women stratified at extreme tertiles of FeBio from Hallberg and Hulthén (2000) and Collings’ (2013) models. The results demonstrate discordance of FeBio from probabilistic approach and algorithm methods while suggesting two models with best performances to rank individuals according to their bioavailable iron intakes. View Full-Text
Keywords: iron status; algorithm; probabilistic approach iron status; algorithm; probabilistic approach
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De Carli, E.; Dias, G.C.; Morimoto, J.M.; Marchioni, D.M.L.; Colli, C. Dietary Iron Bioavailability: Agreement between Estimation Methods and Association with Serum Ferritin Concentrations in Women of Childbearing Age. Nutrients 2018, 10, 650.

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