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New and simple equations to estimate the energy and fat contents and energy density of humans in sickness and health

Published online by Cambridge University Press:  09 March 2007

John F. Sutcliffe ,
Grant S. Knight ,
Jaime C. Pinilla  and
Graham L. Hill
John F. Sutcliffe
Affiliation:
Department of Nuclear Medicine, Leeds General Infirmary, Great George Street, Leeds LSI 3EX
Grant S. Knight
Affiliation:
Department of Surgery, University of Auckland School of Medicine, Park Road, Auckland, New Zealand
Jaime C. Pinilla
Affiliation:
Department of Surgery, Saskatoon University Hospital, University of Saskatchewan School of Medicine, Saskatoon S7N 0x0, Canada
Graham L. Hill
Affiliation:
Department of Surgery, University of Auckland School of Medicine, Park Road, Auckland, New Zealand
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Abstract

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Two formulas were derived to estimate the energy content of the human body which use only body mass, total body water by 3H2O dilution space and body minerals assessed by anthropometry. The formulas were tested in a body composition database of 561 patients and 151 normal volunteers using established metabolizable energy values for protein, fat and glycogen. Total body protein was determined by in vivo neutron activation analysis (IVNAA), body water by dilution of tritium and body minerals from skeletal frame size. Body glycogen was assumed to be 14.6 % of the mineral component. Body fat was obtained by difference, body mass less the sum of water, protein, minerals and glycogen. The standard deviation in the estimate of body energy content was 30 MJ or 4.1 % of the energy content of reference man. Two formulas for body energy content were derived by regression with body mass, total body water and body minerals or height. Two formulas for energy density and formulas for percentage body fat were similarly derived.

Keywords

Body energy contentHuman subjects
Type
Estimation of Human Body Composition
Information
British Journal of Nutrition , Volume 69 , Issue 3 , May 1993 , pp. 631 - 644
Copyright
Copyright © The Nutrition Society 1993

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