| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
ORIGINAL RESEARCH COMMUNICATION |
1 From the Department of Child and Adolescent Health, Xin-Hua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China (X-YS); the Section of Nutrition, Department of Pediatrics, University of Colorado Health Sciences Center, Denver, CO (KMH and NFK); the Yun-Nan Maternal and Children's Hospital, Yun-Nan, China (X-XZ); the Yun-Nan No. 1 People's Hospital, Yun-Nan, China (J-XN); and the Department of Human Nutrition, University of Otago, Dunedin, New Zealand (KBB and RSG)
Background: Measurement of the major variables of zinc homeostasis is an essential prerequisite for estimating human zinc requirements, which currently require a factorial approach. The data required for this approach have not been available for toddlers, whose requirements have been estimated by extrapolation from other age groups.
Objective: The objective of the study was to measure key variables of zinc homeostasis in rural and small-town Chinese toddlers.
Design: Zinc stable-isotope tracers were administered intravenously and orally with all meals for 1 d to 43 toddlers. Subsequent metabolic collections in the homes included duplicate diets, quantitative fecal collections, and spot urine sampling. Fractional absorption of zinc (FAZ) was measured by a dual-isotope tracer ratio technique, and endogenous fecal zinc (EFZ) was measured by an isotope dilution technique.
Results: No group or sex differences were found. Therefore, results were combined for 43 toddlers aged 19–25 mo whose major food staple was white rice. Selected results (
± SD) were 1.86 ± 0.55 mg total dietary Zn/d; 0.35 ± 0.12 FAZ; 0.63 ± 0.24 mg total absorbed Zn/d; 0.67 ± 0.23 mg EFZ/d; and 65.0 ± 8.3 µg plasma Zn/dL. The molar ratio of dietary phytate to zinc was 2.7:1.
Conclusions: The mean intake and absorption of zinc in this population are low in comparison with estimated average dietary and physiologic requirements for zinc, and plasma zinc values are consistent with zinc deficiency. Intestinal losses of endogenous zinc exceed previous estimates for toddlers, and only modest evidence exists of conservation in response to low zinc intake and absorption.
Key Words: Toddlers • zinc intake • zinc absorption • intestinal excretion of endogenous zinc • zinc status
This article has been cited by other articles:
|
|
 |
|
  J. L. Rosado, K. M. Hambidge, L. V. Miller, O. P. Garcia, J. Westcott, K. Gonzalez, J. Conde, C. Hotz, W. Pfeiffer, I. Ortiz-Monasterio, et al. The Quantity of Zinc Absorbed from Wheat in Adult Women Is Enhanced by Biofortification J. Nutr., October 1, 2009; 139(10): 1920 - 1925. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. M. Hambidge, L. V. Miller, J. E. Westcott, and N. F. Krebs Dietary Reference Intakes for Zinc May Require Adjustment for Phytate Intake Based upon Model Predictions J. Nutr., December 1, 2008; 138(12): 2363 - 2366. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 V. Kiedaisch, A. Akel, O. M Niemoeller, T. Wieder, and F. Lang Zinc-induced suicidal erythrocyte death Am. J. Clinical Nutrition, May 1, 2008; 87(5): 1530 - 1534. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. M. Hambidge, M. Mazariegos, N. W. Solomons, J. E. Westcott, S. Lei, V. Raboy, G. Grunwald, L. V. Miller, X. Sheng, and N. F. Krebs Intestinal Excretion of Endogenous Zinc in Guatemalan School Children J. Nutr., July 1, 2007; 137(7): 1747 - 1749. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
