Energy metabolism in free-living, 'large-eating' and 'small-eating' women: studies using 2H2(18)O.
The doubly-labelled water (2H2(18)O) technique was used to assess the long-term rates of energy expenditure and, after accounting for any changes in body composition, the derived rates of energy intake in weight-stable 'large-eating' (n 6) and 'small-eating' (n 6) women. The self-reported energy intakes (approximately 11.2 v. 5.6 MJ/d) and energy expenditures (approximately 8.5 v. 12.4 MJ/d) for the 'large-eating' and 'small-eating' groups respectively, should not be sustainable without significant body-weight changes. 2H2(18)O-assessed rates of energy expenditure for the 'large-eaters' (approximately 8.5 MJ/d) and 'small-eaters' (approximately 11.3 MJ/d) were in close agreement with the results obtained using 5 d, self-reported activity diaries but the derived rates of energy intake for the 'large-' (approximately 8.5 MJ/d) and 'small-eaters' (approximately 10.8 MJ/d) were markedly different from those obtained using self-reported, weighed food diaries. When two 'small-eaters' were supplied with their self-reported energy intakes (approximately 5 MJ/d) for up to 28 d both subjects lost about 0.75 kg body-weight/week. These results provide no support for the existence of 'metabolically efficient' women in the community.
Clark
D
D
CSIRO (Australia), Division of Human Nutrition, Adelaide.
Tomas
F
F
Withers
R T
RT
Chandler
C
C
Brinkman
M
M
Phillips
J
J
Berry
M
M
Ballard
F J
FJ
Nestel
P
P
D000328:Adult; D001835:Body Weight / Q000502:physiology; D017666:Deuterium Oxide; D015930:Diet Records; D004435:Eating / Q000502:physiology*; D002149:Energy Intake / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D007201:Indicator Dilution Techniques; D010103:Oxygen Isotopes
D010103:Oxygen Isotopes; D017666:Deuterium Oxide