A cluster randomised controlled trial of an intervention based on the Health Action Process Approach for increasing fruit and vegetable consumption in Iranian adolescents

Chung Ying Lin, Janneke F.M. Scheerman, Mehdi Yaseri, Amir H. Pakpour, Thomas L. Webb

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Objective: To evaluate an intervention programme based on the Health Action Process Approach and designed to increase the intake of fruit and vegetables (F&V) among Iranian adolescents aged 13 to 18. Design: A randomised controlled trial with three arms examined the short- (1 month) and long-term (6 months) effects of the intervention. There were two intervention groups (one included adolescents only [A group; n = 510]; the second included mothers and adolescents [M + A group; n = 462]) and a control group (n = 483). All participants were recruited from schools. Main outcome measures: Social cognitions, self-regulatory processes and F&V intake. Results: The intervention led to an increase in F&V intake for adolescents in the short and long terms. Adolescents in the M + A group increased their F& V intake more than adolescents in the A group. Outcome expectancies, self-monitoring, intentions, action and coping planning, perceived social support and behavioural automaticity mediated the effect of the intervention on F&V intake. Conclusion: The theory-based intervention led to an increase in F&V intake and promoted more positive social cognitions and self-regulatory processes among Iranian adolescents. The findings also provide evidence that involving mothers in an intervention can confer additional benefit.

Original languageEnglish
Pages (from-to)1449-1468
Number of pages20
JournalPsychology and Health
Volume32
Issue number12
DOIs
Publication statusPublished - 2017 Dec 2

All Science Journal Classification (ASJC) codes

  • Applied Psychology
  • Public Health, Environmental and Occupational Health

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