Food-based strategies improve iron status in toddlers: a randomized controlled trial.

Author(s): Szymlek-Gay EA, Ferguson EL, Heath AL, Gray AR, Gibson RS

Affiliation(s): Departments of Human Nutrition and Preventive and Social Medicine, University of Otago, Dunedin, New Zealand.

Publication date & source: 2009-10-14, Am J Clin Nutr., [Epub ahead of print]

Publication type:

BACKGROUND: Nonanemic iron deficiency is common in toddlers in developed countries. Food-based strategies are safe methods to control and prevent mild micronutrient deficiencies. OBJECTIVE: Our objective was to determine the efficacy of an increased intake of red meat, or the consumption of iron-fortified milk, in improvement of iron status in toddlers at a population level. DESIGN: In this 20-wk randomized placebo-controlled trial, 225 healthy nonanemic 12-20-mo-old children were assigned to 1 of 3 groups: red meat (toddlers encouraged to consume approximately 2.6 mg iron from red meat dishes daily), fortified milk [toddlers' regular milk replaced with iron-fortified (1.5 mg iron/100 g prepared milk) cow milk], or control [toddlers' regular milk replaced with nonfortified (0.01 mg iron/100 g prepared milk) cow milk]. Blood samples were collected at baseline and at 20 wk for hemoglobin, serum ferritin, serum transferrin receptor, and C-reactive protein. The prevalence of suboptimal iron status (ie, depleted iron stores, iron-deficient erythropoiesis, and iron deficiency anemia) was determined, and body iron was calculated. RESULTS: No intervention effects were shown on the prevalence of suboptimal iron status. Serum ferritin increased by 44% (95% CI: 14, 82%; P = 0.002) in the fortified milk group, did not change (+10%) in the red meat group (95% CI: -7, 30%; P = 0.241), and tended to decrease (-14%) in the control group (95% CI: -27, 1%; P = 0.063). By 20 wk, in comparison with the control group, serum ferritin and body iron were significantly higher in the fortified milk group (both P < 0.001) and serum ferritin was significantly higher in the red meat group (P = 0.033). CONCLUSIONS: Consumption of iron-fortified milk can increase iron stores in healthy nonanemic toddlers, whereas increased intakes of red meat can prevent their decline. This trial was registered at actr.org.au as ACTRN12605000487617.