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Obligatory urinary and faecal nitrogen losses in young Chilean men given two levels of dietary energy intake

Published online by Cambridge University Press:  24 July 2007

R. Uauy ,
E. Yáñez ,
D. Ballester ,
G. Barrera ,
E. Guzmán ,
M. T. Saitúa  and
I. Zacarías
R. Uauy
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
E. Yáñez
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
D. Ballester
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
G. Barrera
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
E. Guzmán
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
M. T. Saitúa
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
I. Zacarías
Affiliation:
Institute of Nutrition and Food Technology, University of Chile, PO Box 15138, Santiago 11, Chile
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Abstract

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1. The obligatory nitrogen losses were measured in young adult males of the low socio-economic group, consuming an N-free diet at 192 kJ (46 kcal)/kg per d from day 1 to 10 and 243 kJ (58 kcal)/kg per d from day 11 to 18.

2. All subjects, except one, lost weight compatible with N loss.

3. A kinetic evaluation of the results showed that the asymptotically derived urinary N loss after stability had been reached was 35·8 mg N/kg per d. The mean time to stability was 6·5 d. The subjects showed a trend toward decline in N loss while consuming the high-energy N-free diet.

4. The obligatory faecal N loss for days 1–10 was 16·1 mg N/kg per d and 8 mg N/kg per d for days 11–18.

5. Based on the factorial approach the total obligatory N loss of our subjects, for the initial 10 d, was 57·5 mg N/kg per d.

Type
Papers of direct relevance to Clinical and Human Nutrition
Information
British Journal of Nutrition , Volume 47 , Issue 1 , January 1982 , pp. 11 - 20
Copyright
Copyright © The Nutrition Society 1982

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