title: Social Cognitive Antecedents of Fruit and Vegetable Consumption in Truck Drivers: A Sequential Mediation Analysis.
abstract: OBJECTIVE
  To examine a mechanism by which social cognitive factors may predict fruit and vegetable consumption in long-haul truck drivers.
  
  
  METHODS
  Dietary self-efficacy, positive outcome expectancies, and intentions were assessed in 148 Australian truck drivers, and 1 week later they reported their fruit and vegetable consumption. A theory-guided sequential mediation model was specified that postulated self-efficacy and intention as mediators between outcome expectancies and behavior.
  
  
  RESULTS
  The hypothesized model was confirmed. A direct effect of outcome expectancies was no longer present when mediators were included, and all indirect effects were significant, including the 2-mediator chain (β = .15; P < .05; 95% confidence interval, 0.05-0.32). Truck drivers who expected benefits from dietary change, felt confident about being capable to do so, and formed an intention were likely to report larger amounts of fruit and vegetable intake.
  
  
  CONCLUSIONS
  The results suggest that the role of outcome expectancies and self-efficacy are important to consider for understanding and predicting healthy eating intentions in truck drivers.
authors.affiliation: School of Applied Psychology, Griffith University, Queensland, Australia; School of Psychology and Speech Pathology, Curtin University, Perth, Australia. Electronic address: kyra.hamilton@griffith.edu.au.
authors.forename: Kyra
authors.initials: K
authors.lastname: Hamilton
authors.affiliation: School of Applied Psychology, Griffith University, Queensland, Australia.
authors.forename: Caitlin
authors.initials: C
authors.lastname: Vayro
authors.affiliation: Institute for Positive Psychology and Education, Australian Catholic University, Strathfield, Australia; University of Social Sciences and Humanities, Wroclaw, Poland.
authors.forename: Ralf
authors.initials: R
authors.lastname: Schwarzer
mesh_terms: D000328:Adult; D000368:Aged; D001315:Australia; D001334:Automobile Driving; D005247:Feeding Behavior / Q000523:psychology*; D005638:Fruit; D015438:Health Behavior; D006801:Humans; D033182:Intention; D008297:Male; D008875:Middle Aged; D018986:Motor Vehicles; D011446:Prospective Studies; D020377:Self Efficacy; D014675:Vegetables; D055815:Young Adult
keywords: fruit; intention; outcome expectancies; self-efficacy; social cognitive theory; vegetable