ZINC-ABSORPTION IN INFANTS FED IRON-FORTIFIED WEANING FOOD

The effect of fortification iron (reduced iron) on zinc absorption fro m a commercial vegetable-based weaning food was assessed in 11 9-mo-ol d infants. Each infant was fed a test meal of unfortified or iron-fort ified product, labeled extrinsically with 1 mg Zn-67 or Zn-70 (as citr ate), and the next day was fed the second product labeled with the oth er isotope. A complete fecal collection was carried out for 3-4 d, and the amount of unabsorbed isotope measured by thermal-ionization quadr upole mass spectrometry. Apparent zinc absorption (isotope intake minu s fecal excretion, expressed as the % of dose administered) was 31.1 /- 8.3% ((x) over bar +/- SD) from the iron-fortified food and 28.6 +/ - 10.5% from the unfortified food. These values were not significantly different, thus iron fortification of the weaning food did not reduce zinc absorption.