title: PortionControl@HOME: results of a randomized controlled trial evaluating the effect of a multi-component portion size intervention on portion control behavior and body mass index.
abstract: BACKGROUND
  Food portion sizes influence energy intake.
  
  
  OBJECTIVE
  The purpose of this paper is to determine effectiveness of the "PortionControl@HOME" intervention on body mass index and portion control behavior.
  
  
  METHODS
  A randomized controlled trial among 278 overweight and obese participants was conducted. PortionControl@HOME aimed to increase: portion size awareness, portion control behavior, portion control cooking skills, and to create a home environment favoring portion control.
  
  
  RESULTS
  Intention-to-treat multi-level regression analysis indicated statistically significant effects of the intervention on portion control behavior at 3, 6, and 12 months follow-up. The effect on body mass index was significant only at 3 months follow-up and when outliers (n = 3) were excluded (B = -0.45; 95%CI = -0.88 to -0.04). The intervention effect on body mass index was mediated by portion control behavior.
  
  
  CONCLUSIONS
  The intervention improves portion control behavior, which in turn influence body mass index. Once the intervention ceased, sustained effects on body mass index were no longer evident. (Current-Controlled-Trials ISRCTN12363482).
authors.affiliation: Department of Health Sciences and EMGO+ Institute for Health and Care Research, VU University Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands, m.p.poelman@vu.nl.
authors.forename: Maartje P
authors.initials: MP
authors.lastname: Poelman
authors.forename: Emely
authors.initials: E
authors.lastname: de Vet
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Velema
authors.forename: Michiel R
authors.initials: MR
authors.lastname: de Boer
authors.forename: Jacob C
authors.initials: JC
authors.lastname: Seidell
authors.forename: Ingrid H M
authors.initials: IH
authors.lastname: Steenhuis
mesh_terms: D000328:Adult; D032763:Behavior Control; D015992:Body Mass Index; D005247:Feeding Behavior / Q000502:physiology*; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000628:therapy*; D050177:Overweight / Q000628:therapy*; D016896:Treatment Outcome