Dietary intakes and urinary excretion of calcium and acids: a cross-sectional study of women in China
The relationship between dietary intakes and urinary calcium was examined in a cross-sectional survey of 764 middle-aged and elderly women with markedly different dietary patterns and lifestyles. Urinary calcium was correlated positively with urinary acids, including titratable acid (r = 0.46, P <...
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Published in: | The American journal of clinical nutrition Vol. 58; no. 3; pp. 398 - 406 |
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Main Authors: | , , , |
Format: | Journal Article |
Language: | English |
Published: |
Bethesda, MD
Elsevier Inc
01-09-1993
American Society for Clinical Nutrition American Society for Clinical Nutrition, Inc |
Subjects: | |
Online Access: | Get full text |
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Summary: | The relationship between dietary intakes and urinary calcium was examined in a cross-sectional survey of 764 middle-aged and elderly women with markedly different dietary patterns and lifestyles. Urinary calcium was correlated positively with urinary acids, including titratable acid (r = 0.46, P < 0.0001), ammonia (r = 0.42, P < 0.0001), and sulfate (r = 0.52, P < 0.0001). Urinary excretions of calcium and acids were correlated positively with intakes of animal and nondairy animal protein but were correlated negatively with plant-protein intake, possibly because of the alkaline nature of plant foods. Further analyses showed that urinary calcium and acids were associated positively with acid-forming foods and were associated negatively with plant foods. These results indicate that under free-living conditions urinary calcium excretion is likely determined by the acid-base status of the total diet, including among other factors the contribution of sulfur amino acids to urinary acid production. |
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Bibliography: | 9423795 S01 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0002-9165 1938-3207 |
DOI: | 10.1093/ajcn/58.3.398 |