title: Partner- and planning-based interventions to reduce fat consumption: randomized controlled trial.
abstract: OBJECTIVE
  The research tested the efficacy of partner- and planning-based interventions to reduce dietary fat intake over a 6-month period.
  
  
  METHODS
  Randomized controlled, blinded, parallel trial.
  
  
  METHODS
  A computer randomization feature was used to allocate council employees (N = 427, of which 393 completed baseline measures) to one of four conditions (partner + implementation intentions, partner-only, implementation intentions, and control group) before they completed measures at baseline and follow-ups at 1, 3, and 6 months post-baseline. Outcome measures were comprised of validated self-report measures of dietary fat intake (saturated fat intake, fat intake, ratio of 'good' fats to 'bad' fats); psychosocial mediators (enjoyment, intention, self-efficacy, social influence, partner support); weight and waist size (baseline and 6 months only).
  
  
  RESULTS
  Data from 393 participants were analysed in accordance with intention-to-treat analyses. All intervention groups reported greater reductions in fat intake than the control group at 3 months. The partner-based groups increased the ratio of 'good' fats to 'bad' fats at 3 and 6 months and lost more inches on their waist, versus the non-partner groups. The impacts of the partner-based manipulations on outcomes were partially mediated by greater perceived social influences, partner support, and enjoyment of avoiding high-fat foods. The partner-based interventions also increased intention and self-efficacy. However, the effects in this study were typically small and generally marginally significant.
  
  
  CONCLUSIONS
  Partner-based interventions had some positive benefits on dietary-related outcomes at 3 and 6 months. Support for implementation intentions was more limited.
authors: Institute of Psychological Sciences, University of Leeds, UK.
authors: Andrew
authors: A
authors: Prestwich
authors: Mark T
authors: MT
authors: Conner
authors: Rebecca J
authors: RJ
authors: Lawton
authors: Jane K
authors: JK
authors: Ward
authors: Karen
authors: K
authors: Ayres
authors: Rosemary R C
authors: RR
authors: McEachan
mesh_terms: D000328:Adult; D003299:Cooperative Behavior; D018752:Diet, Fat-Restricted / Q000379:methods*; D004041:Dietary Fats; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D033182:Intention; D008297:Male; D008875:Middle Aged; D020377:Self Efficacy; D012944:Social Support; D016896:Treatment Outcome; D055105:Waist Circumference
chemical_list: D004041:Dietary Fats