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EFFECT OF MOTIVATIONAL INTERVIEWING ON A WEIGHT LOSS PROGRAM BASED ON THE PROTECTION MOTIVATION THEORY

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Abstract

 Background: The prevalence of overweight and obesity is on the increase the world over, which imposes an ever-increasing burden on societies and health care systems.Objectives: This study sought to investigate the effect of MOTIVATIONAL INTERVIEWING (MI) on a weight-loss program based on the protection motivation theory (PMT).Patients and Methods: This randomized clinical trial study, comprising pretest-posttest with a control group, was conducted on 150 overweight and obese women attending a private nutrition clinic for the first time. Samples were randomly selected using the clinic’s records and then allocated to three groups (50 women in each group) receiving: 1) a standard weight-control program; 2) MOTIVATIONAL INTERVIEWING; and 3) MI plus intention intervention. Data were collected using a researcher-made questionnaire through in-person interviews and were analyzed using SPSS (version 11) and statistical tests, including the Kruskal-Wallis test, one-way analysis of variance, paired t-test, and linear regression model.Results: In the two intervention groups, the PMT construct scores, namely susceptibility (P=0.001), severity (P=0.001), rewards (P=0.004), self-efficacy (P=0.001), response efficacy (P=0.001), and costs (P=0.014), were significantly increased compared to those in the control group. The anthropometric status was statistically significant in the MI group (P=0.001) and the MI plus intention-intervention group (P=0.001) at 2 months’ follow-up, while in the control group, weight was meaningfully different after the intervention (P=0.027). Weight was different between the groups after the intervention, with the Tukey test demonstrating that the differences were statistically significant between the control group and the MI group.Conclusions: Our results demonstrated that MI, combined with the implementation of intention intervention, increased WEIGHT LOSS and PMT construct scores in our study population.

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