Effect of Increasing Levels of Zinc Fortificant on the Iron Absorption of Bread Co-Fortified with Iron and Zinc Consumed with a Black Tea

Iron (Fe) and zinc’s (Zn) interaction at the absorptive level can have an effect on the success of co-fortification of wheat flour with both minerals on iron deficiency prevention. The aim of the study was to determine the effect of increasing levels of zinc fortificant on the iron absorption of bread co-fortified with iron and zinc consumed with a black tea. Twelve women aged 33–42 years participated in the study. They received on four different days 200 mL of black tea and 100 g of bread made with wheat flour (70 % extraction) fortified with either 30 mg Fe/kg alone, as ferrous sulfate (A), or with the same Fe-fortified flour, but with graded levels of Zn, as zinc sulfate: 30 mg/kg (B), 60 mg/kg (C), or 90 mg/kg (D). Fe radioisotopes (⁵⁹Fe and ⁵⁵Fe) of high specific activity were used as tracers, and Fe absorption iron was measured by the incorporation of radioactive Fe into erythrocytes. The geometric mean and range of ±1 SD of Fe absorption were as follows: A?=?6.5 % (2.2–19.3 %), B?=?4.6 % (1.0–21.0 %), C?=?2.1 % (0.9–4.9 %), and D?=?2.2 % (0.7–6.6 %), respectively; ANOVA for repeated measures F?=?10.9, p?p?