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Adaptation to a marginal intake of energy in young children

Published online by Cambridge University Press:  09 March 2007

N. Kennedy ,
A. V. Badaloo  and
A. A. Jackson
N. Kennedy
Affiliation:
Tropical Metabolism Research Unit, University of the West Indies, Mona, Kingston 7, Jamaica
A. V. Badaloo
Affiliation:
Tropical Metabolism Research Unit, University of the West Indies, Mona, Kingston 7, Jamaica
A. A. Jackson
Affiliation:
Tropical Metabolism Research Unit, University of the West Indies, Mona, Kingston 7, Jamaica Department of Human Nutrition, University of Southampton, Bassett Crescent East, Southampton SO9 3TU
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Abstract

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Six male children, aged 8–28 months, were studied for three consecutive periods of 1 week each. They were given diets that provided 1.7 g protein/kg per d and supplements of minerals and vitamins, with a metabolizable energy intake during the 1st, 2nd and 3rd week of 419, 293 and 335 kJ (100, 70 and 80 kcal)/kg per d, diets 1, 2 and 3 respectively. All the food offered was consumed. Each child was weighed at the same time each day on an electronic balance. On the 6th and 7th day of each study period urine and stool were collected for 24 h to assess nitrogen balance. Using linear regression analysis it was shown that all children gained weight on diet 1, 2.3 (sd 1.3) g/kg per d, and five of six children gained weight on diet 3, the mean for the whole group being 2.7 (sd 2.3) g/kg per d, not significantly different. On diet 2 all children lost weight, -5.4 (sd 1.3) g/kg per d, highly significantly different from each of the other dietary periods. Using asymptotic regression analysis it could be shown that the rate of weight loss during the first part of the week on diet 2, - 11 g/kg per d, was greater than at the end of the week, - 2 g/kg per d, with a tendency towards a steady weight by day 7. Apparent N retention (mg/kg per d) was positive at the end of each of the three dietary periods: diet 1, 112 (sd 25); diet 2, 54 (sd 34); diet 3, 82 (sd 20). In five of the six children there was a marked reduction in stool frequency on diet 2 compared with diet 1, that was maintained to the period on diet 3. The findings suggest that during the period on diet 2 there was a saving of energy of the order of 105 kJ (25 kcal)/kg per d, which lasted through into the period on diet 3.

Keywords

Energy expenditureEnergy intakeChildren
Type
Energy metabolism and Requirements
Information
British Journal of Nutrition , Volume 63 , Issue 2 , March 1990 , pp. 145 - 154
Copyright
Copyright © The Nutrition Society 1990

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