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Calcium excretion, apparent calcium absorption and calcium balance in young and elderly subjects: influence of protein intake

Published online by Cambridge University Press:  09 March 2007

Daphne L. E. Pannemans ,
Gertjan Schaafsma  and
Klaas R. Westerterp
Daphne L. E. Pannemans
Affiliation:
Department of Human Biology, University of Limburg, PO Box 616, 6200 MD Maastricht, The Netherlands
Gertjan Schaafsma
Affiliation:
Department of Human Nutrition, TNO Toxicology and Nutrition Institute, PO Box 360, 3700 MD Zeist, The Netherlands
Klaas R. Westerterp
Affiliation:
Department of Human Biology, University of Limburg, PO Box 616, 6200 MD Maastricht, The Netherlands
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Abstract

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The present study was conducted to investigate the effect of dietary protein on urinary Ca excretion, apparent Ca absorption and Ca balance in young and elderly subjects. Young adults (n 29) and elderly persons (n 26) consumed diets containing 12% (diet A) and 21% (diet B) of total energy as protein for 3 weeks according to a randomized crossover design. Results showed no differences between the two age groups with respect to the interaction between protein intake and Ca excretion (both in urine and in faeces), apparent Ca absorption and Ca balance. Therefore analyses were done for both age groups separately and also for the whole group. In elderly persons and in the whole group the Ca excretion in faeces (as a percentage of Ca intake) was lower during the higher protein intake (elderly: diet A, 106 (SEM 7)% diet B, 86 (SEM 7) % P = 0·018; whole group: diet A, 99 (SEM 4) % diet B, 84 (SEM 4) % P = 0·003). In young adults faecal Ca excretion tended to be lower when they consumed diet B (diet A: 94 (SEM 5)% diet B: 83 (SEM 6)% P = 0·093). Relative urinary Ca excretion was greater during the higher protein intake in young adults and in the whole group while relative urinary Ca excretion was not different in the elderly (diet A: 15 (SEM 1) %, 14 (SEM 1) %, 15 (SEM 1) % diet B: 16 (SEM 1) %, 16 (SEM 1) % 17 (SEM 2) % for the whole group, the young and elderly subjects respectively, P = 0·019; P = 0·016; P = 0·243).The resulting Ca balance was not influenced by the amount of protein in the diet in young adults. Values for the elderly and for the whole group showed that the Ca balance during diet A was significantly more negative compared with Ca balance during diet B, despite the higher urinary Ca excretion during diet B. It can be concluded that increasing the protein intake from 12 to 21% of total energy ntake had no negative effect on Ca balance.

Keywords

CalciumProtein intakeElderly
Type
Human and Clinical Nutrition
Information
British Journal of Nutrition , Volume 77 , Issue 5 , May 1997 , pp. 721 - 729
Copyright
Copyright © The Nutrition Society 1997

References

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