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

Ann Behav Med. 2015 Feb;49(1):18-28. doi: 10.1007/s12160-014-9637-4.


Background: Food portion sizes influence energy intake.

Purpose: 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).

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Behavior Control*
  • Body Mass Index
  • Feeding Behavior / physiology*
  • Female
  • Health Behavior*
  • Humans
  • Male
  • Middle Aged
  • Obesity / therapy*
  • Overweight / therapy*
  • Treatment Outcome

Associated data

  • ISRCTN/ISRCTN12363482