Energy costs of fat and protein deposition in the human infant.
The energy costs of depositing fat and protein in the low-birth-weight infant were determined by multiple-regression analysis from published information on metabolizable-energy intake and fat and protein deposition in groups of subjects fed different dietary regimes. The total energy requirement for deposition was 1.17 kJ/kJ deposited for fat (ie, 1 kJ deposited and 0.17 kJ expended for deposition, and 2.38 kJ/kJ for protein. These values are similar to published determinations for animal species with simple stomachs. The metabolizable-energy requirement for weight gain during infancy was calculated (range, 12.2-25.1 kJ/g, or 2.9-6.0 kcal/g; means, 18.7 kJ/g, or 4.5 kcal/g) from the energy costs of fat and protein deposition and published information on changes in body composition during the first year of life.
Roberts
S B
SB
School of Science, Massachusetts Institute of Technology, Cambridge 02139.
Young
V R
VR
D000818:Animals; D004032:Diet; D004041:Dietary Fats / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D007227:Infant Nutritional Physiological Phenomena; D007230:Infant, Low Birth Weight / Q000378:metabolism*; D007231:Infant, Newborn; D008297:Male; D051381:Rats
D004041:Dietary Fats; D004044:Dietary Proteins