Journal of Behavioral Medicine

, Volume 38, Issue 4, pp 599–608 | Cite as

Field experiment of a very brief worksite intervention to improve nutrition among health care workers

  • Christopher J. Armitage


Despite the potential of worksite interventions to boost productivity and save insurance costs, they tend to be costly and tested in nonrandomized trials. The aim of the present study was to test the ability of a very brief worksite intervention based on implementation intentions to improve nutrition among health care workers. Seventy-nine health care workers were randomly allocated to a control condition or to form implementation intentions using standard instructions or with a supporting tool. Fruit intake and metacognitive processing (operationalized as awareness of standards, self-monitoring and self-regulatory effort) were measured at baseline and follow-up. Participants who formed implementation intentions ate significantly more fruit and engaged in significantly more metacognitive processing at follow-up than did participants in the control condition (ds > .70). The findings support the efficacy of implementation intentions for increasing fruit intake in health care workers and preliminary support for the utility of a tool to support implementation intention formation.


Worksite intervention Metacognition Brief intervention Health behavior change Implementation intentions Fruit intake Volitional help sheet 



I would like to thank Tasos Droulias for his help with collecting and entering the data.

Conflict of interest

Christopher J. Armitage declares no conflict of interest.

Human and Animal Rights and Informed Consent

The procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all participants for being included in the study.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Manchester Centre for Health Psychology, School of Psychological Sciences, Manchester Academic Health Science CentreUniversity of ManchesterManchesterUK

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