title: Determinants and nature of dietary underreporting in a free-living population: the Fleurbaix Laventie Ville Santé (FLVS) Study.
abstract: OBJECTIVE
  To study the determinants and nature of dietary underreporting in a free-living population.
  
  
  METHODS
  Cross-sectional study of nutritional and behavioural characteristics.
  
  
  METHODS
  1030 weight-stable subjects, 501 women and 529 men older than 15 y, included in the Fleurbaix Laventie Ville Santé study.
  
  
  METHODS
  Dietary intake was assessed using a 3 dy dietary record. Self assessed body weight and height were also recorded. Behavioural and socio-economic data were obtained from a questionnaire. Underreporters were defined as people with a reported ratio of energy intake to estimated basal metabolic rate lower than 1.05.
  
  
  RESULTS
  Underreporting concerned 16% of the population and was significantly more frequent in obese than in non obese subjects (P < 0.001). Underreporting was significantly associated with a high socio-professional class (P < 0.05), having dieted at least once (P < 0.01) and to be in dietary restraint (P < 0.05). Furthermore, the contribution of protein to energy intake was significantly higher in underreporters than in non underreporters, independently of weight status.
  
  
  CONCLUSIONS
  These data underline that underreporting may bias the assessment of energy and macronutrient intake, particularly in studies on obesity and dietary restraint. Questions about weight concern, dieting and dietary restraint may be useful to identify subjects who underestimate their food intake.
authors.affiliation: Institut National de la Santé Et de la Recherche Médicale, Faculté de Médecine Paris Sud, Villejuif, France.
authors.forename: L
authors.initials: L
authors.lastname: Lafay
authors.forename: A
authors.initials: A
authors.lastname: Basdevant
authors.forename: M A
authors.initials: MA
authors.lastname: Charles
authors.forename: M
authors.initials: M
authors.lastname: Vray
authors.forename: B
authors.initials: B
authors.lastname: Balkau
authors.forename: J M
authors.initials: JM
authors.lastname: Borys
authors.forename: E
authors.initials: E
authors.lastname: Eschwège
authors.forename: M
authors.initials: M
authors.lastname: Romon
mesh_terms: D000293:Adolescent; D000328:Adult; D001481:Basal Metabolism; D001827:Body Height; D001835:Body Weight; D003430:Cross-Sectional Studies; D015930:Diet Records; D004034:Diet Surveys; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D005602:France; D006801:Humans; D008297:Male; D009765:Obesity; D015203:Reproducibility of Results; D012650:Self Disclosure