Energy MetabolismCalorimetry, IndirectBasal MetabolismHealth ExpendituresEnergy IntakeBody CompositionThermogenesisBody WeightEatingRestOxygen ConsumptionObesityCalorimetryOxygen IsotopesExerciseBody Temperature RegulationLeptinMotor ActivityAdipose TissueAdipose Tissue, BrownEnergy TransferPhysical ExertionWeight LossDietary FatsBody WaterAppetiteDeuterium OxideFeeding BehaviorAnthropometryWeight GainBody Mass IndexHyperphagiaFinancing, PersonalAccelerationDeuteriumNutritional RequirementsDietary CarbohydratesAdipocytes, BrownAdiposityBody Fluid CompartmentsDietary ProteinsBody TemperatureInsulinDietOxidation-ReductionLipid MetabolismHypothalamusDiet, ReducingBlood GlucoseAdipose Tissue, WhiteAccelerometryMitochondrial ProteinsVideo GamesRegression AnalysisWalkingGlucoseMuscle, SkeletalTime FactorsDiet RecordsThinnessFoodAppetite RegulationCaloric RestrictionHeart RateCross-Over StudiesDiet, High-FatNutrition DisordersReceptors, LeptinAbsorptiometry, PhotonFatsRunningGhrelinPhysical FitnessFastingSleepMonitoring, AmbulatoryUnited StatesHomeostasisAnalysis of VarianceMelanocortinsSedentary LifestyleReceptor, Melanocortin, Type 4Agouti-Related ProteinNutritional StatusPostprandial PeriodEnvironment, ControlledModels, BiologicalCatastrophic IllnessOverweightCarbon DioxideInflation, EconomicInsulin ResistanceCapital ExpendituresCachexiaRespirationMice, Inbred C57BLLinear ModelsAgingAnti-Obesity AgentsPro-Opiomelanocortin