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A moderately high intake compared to a low intake of zinc depresses magnesium balance and alters indices of bone turnover in postmenopausal women.
Eur J Clin Nutr 2004; 58(5):703-10EJ

Abstract

OBJECTIVES

To determine whether moderately high or low intakes of zinc adversely affect the copper status of postmenopausal women to result in unfavorable changes in calcium and magnesium metabolism and other indicators of bone turnover.

DESIGN

After a 10-day equilibration period in which the diet provided 31.5 micromol (2 mg) Cu and 137.7 micromol (9 mg) Zn/8.4 MJ (2000 kcal), the subjects were randomly divided into two groups, with one group fed the basal diet supplemented to provide 15.7 micromol (1 mg) Cu/8.4 MJ, and the other group fed the same diet supplemented to provide 47.2 micromol (3 mg) Cu/8.4 MJ. After equilibration, both groups were fed the basal diet with no zinc supplemented (provided 45.9 micromol [3 mg] Zn/8.4 MJ) for 90 days; this was followed by another 10-day equilibration period before the basal diet was supplemented with zinc to provide 811 micromol (53 mg)/8.4 MJ for 90 days.

SETTING

The metabolic unit of the Grand Forks Human Nutrition Research Center, Grand Forks, ND, USA.

SUBJECTS

A total of 28 postmenopausal women recruited by advertisement throughout the United States of America. Among them, 25 women (64.9+6.7 y) completed the study; 21 as designed.

RESULTS

The moderately high intake compared to the low intake of zinc increased the excretion of magnesium in the feces and urine, which resulted in a decreased magnesium balance. In the women fed low dietary copper, plasma osteocalcin was higher during the low-zinc than high-zinc dietary period. The urinary excretion of N-telopeptides was increased and the serum calcitonin concentration was decreased by high dietary zinc regardless of dietary copper.

CONCLUSIONS

A moderately high intake of zinc (811 micromol/day; 53 mg/day) did not induce changes in copper metabolism that resulted in unfavorable changes in bone or mineral metabolism. However, low dietary zinc (45.9 micromol/day; 3 mg/day) apparently resulted in undesirable changes in circulating calcitonin and osteocalcin. As a moderately high intake of zinc decreased magnesium balance, further study of the possibility that a high intake of zinc is a health concern for individuals consuming less than the recommended amounts of magnesium is warranted.

Authors+Show Affiliations

US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202-9034, USA. fnielsen@gfhnrc.ars.usda.govNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15116072

Citation

Nielsen, F H., and D B. Milne. "A Moderately High Intake Compared to a Low Intake of Zinc Depresses Magnesium Balance and Alters Indices of Bone Turnover in Postmenopausal Women." European Journal of Clinical Nutrition, vol. 58, no. 5, 2004, pp. 703-10.
Nielsen FH, Milne DB. A moderately high intake compared to a low intake of zinc depresses magnesium balance and alters indices of bone turnover in postmenopausal women. Eur J Clin Nutr. 2004;58(5):703-10.
Nielsen, F. H., & Milne, D. B. (2004). A moderately high intake compared to a low intake of zinc depresses magnesium balance and alters indices of bone turnover in postmenopausal women. European Journal of Clinical Nutrition, 58(5), pp. 703-10.
Nielsen FH, Milne DB. A Moderately High Intake Compared to a Low Intake of Zinc Depresses Magnesium Balance and Alters Indices of Bone Turnover in Postmenopausal Women. Eur J Clin Nutr. 2004;58(5):703-10. PubMed PMID: 15116072.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A moderately high intake compared to a low intake of zinc depresses magnesium balance and alters indices of bone turnover in postmenopausal women. AU - Nielsen,F H, AU - Milne,D B, PY - 2004/4/30/pubmed PY - 2005/3/4/medline PY - 2004/4/30/entrez SP - 703 EP - 10 JF - European journal of clinical nutrition JO - Eur J Clin Nutr VL - 58 IS - 5 N2 - OBJECTIVES: To determine whether moderately high or low intakes of zinc adversely affect the copper status of postmenopausal women to result in unfavorable changes in calcium and magnesium metabolism and other indicators of bone turnover. DESIGN: After a 10-day equilibration period in which the diet provided 31.5 micromol (2 mg) Cu and 137.7 micromol (9 mg) Zn/8.4 MJ (2000 kcal), the subjects were randomly divided into two groups, with one group fed the basal diet supplemented to provide 15.7 micromol (1 mg) Cu/8.4 MJ, and the other group fed the same diet supplemented to provide 47.2 micromol (3 mg) Cu/8.4 MJ. After equilibration, both groups were fed the basal diet with no zinc supplemented (provided 45.9 micromol [3 mg] Zn/8.4 MJ) for 90 days; this was followed by another 10-day equilibration period before the basal diet was supplemented with zinc to provide 811 micromol (53 mg)/8.4 MJ for 90 days. SETTING: The metabolic unit of the Grand Forks Human Nutrition Research Center, Grand Forks, ND, USA. SUBJECTS: A total of 28 postmenopausal women recruited by advertisement throughout the United States of America. Among them, 25 women (64.9+6.7 y) completed the study; 21 as designed. RESULTS: The moderately high intake compared to the low intake of zinc increased the excretion of magnesium in the feces and urine, which resulted in a decreased magnesium balance. In the women fed low dietary copper, plasma osteocalcin was higher during the low-zinc than high-zinc dietary period. The urinary excretion of N-telopeptides was increased and the serum calcitonin concentration was decreased by high dietary zinc regardless of dietary copper. CONCLUSIONS: A moderately high intake of zinc (811 micromol/day; 53 mg/day) did not induce changes in copper metabolism that resulted in unfavorable changes in bone or mineral metabolism. However, low dietary zinc (45.9 micromol/day; 3 mg/day) apparently resulted in undesirable changes in circulating calcitonin and osteocalcin. As a moderately high intake of zinc decreased magnesium balance, further study of the possibility that a high intake of zinc is a health concern for individuals consuming less than the recommended amounts of magnesium is warranted. SN - 0954-3007 UR - https://www.unboundmedicine.com/medline/citation/15116072/A_moderately_high_intake_compared_to_a_low_intake_of_zinc_depresses_magnesium_balance_and_alters_indices_of_bone_turnover_in_postmenopausal_women_ L2 - http://dx.doi.org/10.1038/sj.ejcn.1601867 DB - PRIME DP - Unbound Medicine ER -