Objective: The current research created and validated three new measures of psychological mechanisms associated with dietary behavior: (i) a Dietary Goal-Desire Incongruence scale assessed the degree of conflict between ideal dietary behavior and incongruent tempting desires; (ii) a Motivation for Dietary Self-control scale measured the extent and type of motivation, according to Self-Determination Theory, which may be experienced when trying to control dietary behavior; and (iii) a Satisfaction with Dietary Behavior scale measured successful dietary goal-behavior alignment.
Method: A representative sample of Australian adults (N = 448, Mage = 45.7 years, SD = 16.98, 50.2% women) rated items assessing the three target constructs and also completed established scales that measure related and unrelated constructs.
Results: Exploratory factor analyses indicated a 1-factor Dietary Goal-Desire Incongruence scale (6 items), 3-factor Motivation for Dietary Self-control scale (11 items), and a 1-factor Satisfaction with Dietary Behavior scale (8 items). Confirmatory factor analyses also supported the model fit of each scale's factor solution. Internal consistency as assessed by Cronbach's alpha (α) was 0.94, 0.78, and 0.94 for the three scales, respectively. A follow-up mediation analysis revealed a stage model of psychological factors related to dietary behavior (as assessed by these three scales) that build on each other. Test-retest reliability was high for each scale (r = .71-.84) and showed sound predictive validity.
Conclusion: The Dietary Goal-Desire Incongruence scale, Motivation for Dietary Self-control scale, and Satisfaction with Dietary Behavior scale show good psychometric properties and are brief, easy to administer measures. The utility of the scales can be explored further with other populations and in intervention studies.
Keywords: Diet; Incongruence; Motivation; Self-Determination Theory; Self-control.
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