Evidence that boosters augment the long-term impact of implementation intentions on fruit and vegetable intake

Janine Chapman, Christopher Armitage

    Research output: Contribution to journalArticle

    41 Citations (Scopus)

    Abstract

    The present study tests the efficacy of a single implementation intention to increase intake over a 6-month period, and investigates whether deploying a second implementation intention at 3 months can sustain the long-term impact, compared with passive and active control groups. Participants (N = 650) completed single-item and FFQ measures of behaviour and motivation at baseline before being randomised to one of six conditions in a between-persons design. Intention to treat analysis revealed that for the single- a second implementation intention at 3 months was successful in increasing intake over 6 months, and acted as a booster on the initial impact; and (3) neither the passive nor active control condition had any impact on behaviour. However, no effects of the manipulations on fruit and vegetable intake were found when behaviour was assessed by the FFQ measure. Secondary analyses showed that reported increases in intake were not related to demand characteristics. The findings are discussed in relation to their conceptual and practical value.

    Original languageEnglish
    Pages (from-to)365-381
    Number of pages17
    JournalPsychology and Health
    Volume25
    Issue number3
    DOIs
    Publication statusPublished - Mar 2010

    Keywords

    • Boosters, Maintenance
    • Demand characteristics
    • Fruit and vegetables
    • Implementation intentions

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