title: Lower "awake and fed thermogenesis" predicts future weight gain in subjects with abdominal adiposity.
abstract: Awake and fed thermogenesis (AFT) is the energy expenditure (EE) of the nonactive fed condition above the minimum metabolic requirement during sleep and is composed of the thermic effect of food and the cost of being awake. AFT was estimated from whole-room 24-h EE measures in 509 healthy subjects (368 Native Americans and 141 whites) while subjects consumed a eucaloric diet. Follow-up data were available for 290 Native Americans (median follow-up time: 6.6 years). AFT accounted for ~10% of 24-h EE and explained a significant portion of deviations from expected energy requirements. Energy intake was the major determinant of AFT. AFT, normalized as a percentage of intake, was inversely related to age and fasting glucose concentration and showed a nonlinear relationship with waist circumference and BMI. Spline analysis demonstrated that AFT becomes inversely related to BMI at an inflection point of 29 kg/m(2). The residual variance of AFT, after accounting for covariates, predicted future weight change only in subjects with a BMI >29 kg/m(2). AFT may influence daily energy balance, is reduced in obese individuals, and predicts future weight gain in these subjects. Once central adiposity develops, a blunting of AFT may occur that then contributes to further weight gain.
authors: Obesity and Diabetes Clinical Research Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Arizona.
authors: Paolo
authors: P
authors: Piaggi
authors: Jonathan
authors: J
authors: Krakoff
authors: Clifton
authors: C
authors: Bogardus
authors: Marie S
authors: MS
authors: Thearle
mesh_terms: D050153:Abdominal Fat / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D001481:Basal Metabolism / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D056128:Obesity, Abdominal / Q000378:metabolism; D022722:Thermogenesis / Q000502:physiology*; D015430:Weight Gain / Q000502:physiology*
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