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International Journal of Behavioral Medicine

, Volume 25, Issue 2, pp 265–270 | Cite as

Effects of Self-Efficacy on Healthy Eating Depends on Normative Support: a Prospective Study of Long-Haul Truck Drivers

  • Kyra Hamilton
  • Martin S. Hagger
Article

Abstract

Purpose

Fruit and vegetable intake (FV) is insufficient in industrialized nations and there is excess of discretionary food choices (DC; foods high in fat, sugar, and salt). Long-haul truck drivers are considered a particularly at-risk group given the limited food choices and normatively reinforced eating habits at truck rest-stops. Self-efficacy and normative support are key determinants of eating behavior yet the processes underlying their effects on behavior are not well understood. We tested the direct and interactive effects of self-efficacy and normative support on healthy eating behaviors in long-haul truck drivers in a prospective correlational study.

Method

Long-haul truck drivers (N = 82) completed an initial survey containing self-report measures of behavioral intentions, perceived normative support, and self-efficacy for their FV and DC behaviors. Participants completed a follow-up survey 1 week later in which they self-reported their FV and DC behavior.

Results

A mediated moderation analysis identified an interactive effect of self-efficacy and normative support on behavior mediated by intention for FV and DC behavior. Specifically, we confirmed a compensation effect in which self-efficacy was more likely to have an effect on FV and DC behavior through intentions in participants with low normative support.

Conclusion

Results indicate the importance of self-efficacy in predicting FV and DC intentions and behavior in the absence of a supportive normative environment. The compensatory effect of self-efficacy beliefs on behavior through intentions when normative support is low should be confirmed using experimental methods.

Keywords

Self-confidence Social support Group norms Fruit and vegetable intake Discretionary choices Nutrition 

Notes

Acknowledgements

We thank Caitlin Vayro and Daniel Brown for their help in data collection.

Funding

Martin S. Hagger’s contribution was supported by a Finland Distinguished Professor (FiDiPro) award from Tekes, a Finnish funding agency for innovation.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

Informed consent was obtained from all individual participants included in the study.

Supplementary material

12529_2017_9685_MOESM1_ESM.docx (27 kb)
ESM 1 (DOCX 26 kb)
12529_2017_9685_MOESM2_ESM.docx (16 kb)
ESM 2 (DOCX 16 kb)

References

  1. 1.
    Katz DL, Meller S. Can we say what diet is best for health? Annu Rev Public Health. 2014;24:83–103.  https://doi.org/10.1146/annurev-publhealth-032013-182351.CrossRefGoogle Scholar
  2. 2.
    WHO. Obesity and overweight. Geneva: World Health Organization; 2016. Retreived from http://www.who.int/mediacentre/factsheets/fs311/en/ Google Scholar
  3. 3.
    WHO. Healthy diet. Geneva: World Health Organization; 2015. Retreived from http://www.who.int/mediacentre/factsheets/fs394/en/ Google Scholar
  4. 4.
    NHMRC. Australian dietary guidelines. Canberra: National Health and Medical Research Council; 2013.Google Scholar
  5. 5.
    Apostolopoulos Y, Sonmez S, Shattell MM, Haledman L, Strack R, Jones V. Barriers to truck drivers’ healthy eating: environmental influences and health promotion strategies. J Work Behav Health. 2011;26:122–43.CrossRefGoogle Scholar
  6. 6.
    Whitfield Jacobson PJ, Prawitz AD, Lukaszuk JM. Long-haul truck drivers want healthful meal options at truck-stop restaurants. J Am Diet Assoc. 2007;107:2125–9.  https://doi.org/10.1016/j.jada.2007.09.003.CrossRefPubMedGoogle Scholar
  7. 7.
    Bandura A. Self-efficacy: the exercise of control. New York: Freeman; 1997.Google Scholar
  8. 8.
    Burg J. Determinants of healthy eating: motivation, abilities and environmental opportunities. Fam Pr. 2008;25:150–5.Google Scholar
  9. 9.
    Michaelidou N, Christodoulides G, Torova K. Determinants of healthy eating: a crossnational study on motives and barriers. Int J Consum Stud. 2012;36:17–22.CrossRefGoogle Scholar
  10. 10.
    White KM, Hogg MA, Terry DJ. Improving attitude-behavior correspondence through exposure to normative support from a salient ingroup. Basic Appl Soc Psychol. 2002;24:91–103.CrossRefGoogle Scholar
  11. 11.
    Warner LM, Ziegelmann JP, Schüz B, Wurm S, Schwarzer R. Synergistic effect of social support and self-efficacy on physical exercise in older adults. J Aging Phys Act. 2011;19:249–61.  https://doi.org/10.1123/japa.19.3.249.CrossRefPubMedGoogle Scholar
  12. 12.
    Dishman RK, Saunders RP, Motl RW, Dowda M, Pate RR. Self-efficacy moderates the relation between declines in physical activity and perceived social support in high school girls. J Pediatr Psychol. 2009;34:441–51.CrossRefPubMedGoogle Scholar
  13. 13.
    Hamilton K, Warner LM, Schwarzer R. The role of self-efficacy and friend support on adolescent vigorous physical activity. Health Educ Behav. 2017;44:175–81.  https://doi.org/10.1177/1090198116648266.CrossRefPubMedGoogle Scholar
  14. 14.
    Fairchild AJ, MacKinnon DP. A general model for testing mediation and moderation effects. Prev Sci. 2009;10:87–99.CrossRefPubMedPubMedCentralGoogle Scholar
  15. 15.
    Hamilton K, Kirkpatrick A, Rebar A, Hagger MS. Child sun safety: application of an integrated behavior change model. Health Psychol. 2017;  https://doi.org/10.1037/hea0000533.
  16. 16.
    Hagger MS, Trost N, Keech J, Chan DKC, Hamilton K. Predicting sugar consumption: application of an integrated dual-process, dual-phase model. Appetite. 2017;116:147–56.  https://doi.org/10.1016/j.appet.2017.04.032.CrossRefPubMedGoogle Scholar
  17. 17.
    Terry DJ, Hogg MA. Group norms and the attitude-behavior relationship: a role for group identification. Personal Soc Psychol Bull. 1996;22:776–93.CrossRefGoogle Scholar
  18. 18.
    Stevenson M, Sharwood LN, Wong K, Elkington J, Meuleners L, Ivers RQ, et al. The heavy vehicle study: a case-control study investigating risk factors for crash in long distance heavy vehicle drivers in Australia. BMC Pub Health. 2010;10:162.  https://doi.org/10.1186/1471-2458-10-162.CrossRefGoogle Scholar
  19. 19.
    MacKinnon DP, Fairchild AJ. Current directions in mediation analysis. Curr Dir Psychol Sci. 2009;18:16–20.CrossRefPubMedPubMedCentralGoogle Scholar
  20. 20.
    Hayes AF. Introduction to mediation, moderation, and conditional process analysis: a regression-based approach. Methodology in the social sciences. New York: Guildford Press; 2013.Google Scholar
  21. 21.
    Knäuper B, Roseman M, Johnson PJ, Krantz LH. Using mental imagery to enhance the effectiveness of implementation intentions. Curr Psychol. 2009;28:181–6.  https://doi.org/10.1007/s12144-009-9055-0.CrossRefGoogle Scholar
  22. 22.
    Hagger MS, Luszczynska A, de Wit J, Benyamini Y, Burkert S, Chamberland P-E, et al. Implementation intention and planning interventions in health psychology: recommendations from the synergy expert group for research and practice. Psychol Health. 2016;31:814–39.  https://doi.org/10.1080/08870446.2016.1146719.CrossRefPubMedGoogle Scholar
  23. 23.
    Zhou G, Gan Y, Hamilton K, Schwarzer R. The role of social support and self-efficacy for planning fruit and vegetable intake. J Nutr Educ Behav. 2017;49:100–7.  https://doi.org/10.1016/j.jneb.2016.09.005.CrossRefPubMedGoogle Scholar

Copyright information

© International Society of Behavioral Medicine 2017

Authors and Affiliations

  1. 1.School of Applied PsychologyGriffith University and Menzies Health Institute QueenslandMt GravattAustralia
  2. 2.Health Psychology and Behavioral Medicine Research Group, School of Psychology and Speech PathologyCurtin UniversityPerthAustralia
  3. 3.Faculty of Sport and Health SciencesUniversity of JyväskyläJyväskyläFinland

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