title: Energy requirements of infants.
abstract: OBJECTIVE
  To estimate the energy requirements of infants from total energy expenditure and energy deposition during growth.
  
  
  METHODS
  Energy requirements during infancy were estimated from total energy expenditure measured by the doubly labelled water method and energy deposition based on measured protein and fat gains.
  
  
  METHODS
  Database on the total energy expenditure and energy deposition of infants was compiled from available studies conducted in China, Chile, Gambia, Mexico, The Netherlands, UK, and USA.
  
  
  METHODS
  Healthy, term infants.
  
  
  RESULTS
  Total energy requirements (kJ day(-1)) increased with age and were higher in boys than girls due to differences in weight. Energy requirements decreased from 473 kJ kg(-1) per day for boys and 447 kJ kg(-1) per day for girls at 1 month of age to 337 kJ kg(-1) per day for boys and 341 kJ kg(-1) per day for girls at 6 months of age, and thereafter tended to plateau. Energy deposition as a percentage of total energy requirements decreased from 40% at 1 month to 3% at 12 months of age. These estimates are 10-32% lower than the 1985 FAO/WHO/UNU recommendations which were based on observed energy intakes of infants.
  
  
  CONCLUSIONS
  Recommendations for the energy intake of infants should be revised based on new estimates of total energy expenditure and energy deposition.
authors.affiliation: USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030, USA. nbutte@bcm.tmc.edu
authors.forename: Nancy F
authors.initials: NF
authors.lastname: Butte
mesh_terms: D000367:Age Factors; D001481:Basal Metabolism; D001834:Body Water / Q000378:metabolism; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D007201:Indicator Dilution Techniques; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena; D007231:Infant, Newborn / Q000254:growth & development*; D008297:Male; D009751:Nutritional Requirements; D012737:Sex Factors