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ObjectiveTo characterise misreporters of energy intake (EI) and energy expenditure (EE).DesignCross-sectional study, using a validated position and motion instrument, ActiReg®, as the reference method to study misreporters of EI and of EE. EI was measured using a dietary record and EE using a physical activity questionnaire (PAQ). Misreporters were defined as subjects outside the 95% confidence limits of agreement between EI or EE reported/EE measured.SettingFree-living Danish volunteers.SubjectsOne hundred and thirty-eight volunteers aged between 20 and 59 years.ResultsBody mass index, smoking, ‘try to eat healthily’ and worries about weight were related to degree of under-reported EI. The percentage energy from added sugar was lowest (P < 0.001) and the percentage energy from protein (P < 0.001) highest in under-reporters compared with acceptable reporters. Subjects who reported being …