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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Bibliographic Details
Published in:The American journal of clinical nutrition Vol. 58; no. 3; pp. 398 - 406
Main Authors: Hu, JF, Zhao, XH, Parpia, B, Campbell, TC
Format: Journal Article
Language:English
Published: Bethesda, MD Elsevier Inc 01-09-1993
American Society for Clinical Nutrition
American Society for Clinical Nutrition, Inc
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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.
Bibliography:9423795
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ISSN:0002-9165
1938-3207
DOI:10.1093/ajcn/58.3.398