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Can body size predict infant energy requirements?
1Childhood Nutrition Research Centre, Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK. J.Wells@ich.ucl.ac.uk
Insights
Body size is a poor predictor of individual infant energy needs. Current predictive equations for healthy infants may not apply to those with altered physical activity or growth.
Area of Science:
- Pediatrics
- Human Physiology
- Nutritional Science
Background:
- Infant energy requirements traditionally estimated using body size or age.
- Physical activity is considered for older children and adults but not typically for infants.
- The predictive accuracy of body size for individual infant energy expenditure remains unclear.
Purpose of the Study:
- To assess the relationship between body size and total energy expenditure in infants.
- To determine the accuracy of body size as an index for individual infant energy requirements.
- To evaluate the suitability of predictive equations for healthy infants in disease states.
Main Methods:
- Utilized data from 232 total energy expenditure measurements in 124 infants (1.5–12 months old).
- Analyzed the correlation between body size parameters (age, weight, fat-free mass) and energy expenditure.
- Compared prediction errors for total energy expenditure versus basal metabolism.
Main Results:
- Age, weight, and fat-free mass predicted total energy expenditure with a 21–23% error.
- This prediction accuracy is significantly lower than that for basal metabolism (10% error) using anthropometry.
- Body size demonstrated a poor ability to predict energy use in individual infants.
Conclusions:
- Body size is an insufficient predictor of total energy requirements for individual infants.
- Predictive equations derived from healthy infants are likely unsuitable for infants experiencing altered physical activity or growth.
- Further research is needed to develop accurate energy expenditure models for diverse infant populations.
Abstract:
Traditionally, infant energy requirements have been predicted from body size or age, whereas in older children and adults, physical activity is also taken into account. However, the extent to which body size determines energy use in individual infants has not been considered. Data on 232 measurements of total energy expenditure obtained in 124 infants aged 1.5 to 12 months were used to assess the relation between body size and energy use in individuals. Age, weight, and fat free mass consistently predicted total energy expenditure with an error of 21-23%. This contrasts greatly with the error of 10% with which infant basal metabolism can be predicted from anthropometry. Body size is a poor index of the total energy requirements of individual infants, and predictive equations generated from data on healthy infants will be inappropriate for disease states where physical activity or growth is altered.