Increasing fruit and vegetable intake over a six-month period: An investigation of 'booster' implementation intentions

Janine Chapman, Christopher Armitage

Research output: Contribution to journalMeeting Abstractpeer-review


Background:This study tests a new concept of ‘booster’ if-then plans to enhance the longitudinal effectiveness of implementation intentions to increase fruit and vegetable intake in a young adult population.Methods:Participants (N¼650) completed measures of motivation and behaviour before being randomised to a 3 (intervention format: Passive control vs. active control vs. if-then plan)2(booster intervention: If-then plan at 3 months vs. no if-then plan at 3 months) between-participants design. Follow-up measures were taken at three (T2) and six months (T3). Analyses were conducted on an intention to treat basis, ANOVA was used.Findings:(a) total intake increased by 0.23 portions over 6 months (F(1, 644)¼37.01,p50.01). In the if-then plan conditions: (b) allocating a booster at three months resulted in a 0.53 portion increase from T2–T3 (F(1, 118)¼54.06,p50.01) (c) no booster at three months lead to a decrease by0.22 portions from T2–T3 (F(1, 118)¼15.59,p50.01). Discussion:Booster if-then plans can be used to enhance the longitudinal efficacy of implementation intentions in this area. Further research is required to apply these preliminary ideas to other health behaviours.
Original languageEnglish
Pages (from-to)S79
Number of pages1
JournalPsychology & Health
Issue numberSupp 1
Publication statusPublished - 15 Aug 2008
Externally publishedYes
EventEHPS/DHP Conference 2008 -
Duration: 9 Sep 200811 Sep 2008


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