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American Journal of Clinical Nutrition, Vol 43, 288-292, Copyright © 1986 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
NF Krebs and KM Hambidge
Longitudinal changes in dietary zinc requirements for infants at different levels of net absorption were estimated using a factorial approach. Apart from variations in net absorption, the zinc needed for new lean body mass is the major determinant of requirements. As growth velocity declines progressively, estimated zinc requirements for growth and for replacement of urine and sweat losses decrease from a high for male infants of 780 micrograms/day at 1 mo to 480 micrograms/day in the 5th mo and then remain quite constant through the 1st yr. Calculated percentage absorption of zinc from human milk necessary to meet estimated requirements increases with duration of lactation. For infants of mothers whose zinc intake approximated 25 mg/day the calculated percentage absorption remained within plausible limits. It is suggested that the progressive decrease in milk zinc concentrations provides a mechanism for conserving maternal zinc while meeting infant needs.
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