Targeted Messages Increase Dairy Consumption in Adults: a Randomized Controlled Trial
Dairy consumption amongst North Americans aged 30–50 has been declining. Targeted messages have been identified as a cost-efficient method through which to increase health-enhancing behavior, such as dairy intake.
The aim of this study is to assess the utility of targeted, framed, efficacy-enhancing messages on calcium consumption from dairy in adults aged 30–50 in a randomized controlled trial.
Seven hundred and thirty-two individuals (463 women, 269 men; M age = 40.57 years) were randomly assigned to one of five message conditions: (1) gain-framed (GF), (2) loss-framed (LF), (3) self-regulatory efficacy-enhancing (SRE), (4) GF plus SRE (GF + SRE), or (5) LF plus SRE (LF + SRE). Conditions were separate for men and women. Each condition received an emailed message on four consecutive days. Calcium intake from dairy, self-regulatory efficacy, outcome expectations, and outcome value were measured at baseline, 1 and 4 weeks following the intervention.
Calcium intake from dairy significantly increased from baseline to week 1 post-intervention in all conditions (p < .001). A significant message condition x time interaction (p = .04) revealed that increases seen in the LF + SRE condition were maintained at week 4. All social cognitive constructs increased following the intervention (ps < .01). Self-regulatory efficacy (β = .28, p < .01) and outcome expectations (β = .19, p < .01) were significant predictors of subsequent calcium intake (week 4) from dairy.
Taken together, it appears as though ensuring message content is targeted to the specific population’s beliefs and motives is of importance when developing behavioral change intervention material.
KeywordsCalcium consumption Behavior change Targeting Framing Efficacy-enhancing
Compliance With Ethical Standards
Conflict of Interest
Authors’ Statement of Conflict of Interest and Adherence to Ethical Standards Authors Jung, Latimer-Cheung, Bourne, and Martin Ginis declare that they have no conflict of interest. All procedures, including the informed consent process, were conducted 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.
All procedures performed 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 was obtained from all individual participants included in the study.
Mary E. Jung, School of Health and Exercise Sciences, University of British Columbia. Amy E. Latimer-Cheung, School of Kinesiology and Health Studies, Queen’s University. Jessica E. Bourne, School of Health and Exercise Sciences, University of British Columbia. Kathleen A. Martin Ginis, Department of Kinesiology, McMaster University.
This research was supported by a grant from the Canadian Agri-Science Clusters Initiative, Dairy Research Cluster (Dairy Farmers of Canada, Agriculture and Agri-Food Canada, and Canadian Dairy Commission). The funders were not involved in the analyses of data or preparation of this manuscript. The views expressed in this publication are those of the authors and not necessarily those of the Dairy Farmers of Canada.
- 6.Canadian Dairy Information Centre. Consumption of dairy products. Ottawa, Ontario: Statistics Canada; 2013. Available at http://www.dairyinfo.gc.ca/. Accessibility verified September 21st, 2012.
- 7.Statistics Canada. Visual census, age and sex, Canada. 2006 Census. Ottawa, Ontario: Statistic Canada; 2010. Available at https://www12.statcan.gc.ca. Accessibility verified July 28th 2015.
- 9.Jung ME, Stapleton J, Stork MJ, Bourne JE, Martin Ginis KA. A systematic review of interventions aimed at increasing calcium intake in adults: Where do we go from here? Int J of Food Saf Nutr Publ Health. in press.Google Scholar
- 14.Bandura A. Social foundations of thought and action: A social cognitive theory. NJ US: Prentice-Hall, Inc; 1986.Google Scholar
- 19.Weiglein C, Brochette D, Duncan SE. College-age women’s perceptions of dairy foods. Forum Fam Consum Issues. 2000; 5: 27.Google Scholar
- 25.Gutiérrez-Doña B, Lippke S, Renner B, Kwon S, Schwarzer R. Self-efficacy and planning predict dietary behaviors in Costa Rican and South Korean Women: Two moderated mediation analyses. Appl Psychol: Health Well-Being. 2009; 1: 91-104.Google Scholar
- 28.British Columbia Dairy Foundation. Calcium calculator. Available at http://bcdairy.ca/nutritioneducation/calciumcalculator/. Accessibility verified July 21st, 2012.
- 30.Bandura A. Self-efficacy: The exercise of control. New York, N.Y.: Freeman; 1997.Google Scholar
- 31.McAuley E, Mihalko SL. Measuring exercise-related self-efficacy. In: Duda JL, ed. Advances in sport and exercise psychology measurement. USA: Fitness Information, Inc; 1998: 371-381.Google Scholar
- 33.Tabachnick BG, Fidell LS. Using multivariate statistics. 5th ed. Boston: Allyn and Bacon; 2006.Google Scholar
- 35.Rothman AJ, Updergraff JA. Specifying when and how gain- and loss-framed messages motivate behavior: An integrated approach. In: Keren G, ed. Perspectives on Framing. New York: Psychology Press; 2011: 257-278.Google Scholar
- 36.O’Keefe DJ, Jensen JD. The relative effectiveness of gain-framed and loss-framed persuasive appeals concerning obesity-related behaviors: Meta-analytic evidence and implications. In: Batra R, Keller PA, Strecher VJ, eds. Leveraging consumer psychology for effective health communications: The obesity challenge. Armonk, NY: M. E. Sharpe; 2011: 171-185.Google Scholar