The Multiple Pathways by Which Trait Self-Control Predicts Health Behavior
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- Hagger, M.S. ann. behav. med. (2014) 48: 282. doi:10.1007/s12160-014-9631-x
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I agree with Hankonen et al.’s interpretation that the direct and mediated effects of trait self-control on healthy eating reflect more impulsive and reasoned effects, respectively; I identified both relationships in my model  (Fig. 1, paths 1 and 2). These pathways are consistent with generalized models that propose automatic vs. deliberative reflective routes to behavior . In my model, I propose that a further process by which trait self-control affects behavior is by moderating the intention–behavior relationship (Fig. 1, path 3). This process was untested in Hankonen et al.’s research. Given the importance attached to resolving the intention–behavior “gap” in health psychology , this is a critical pathway. Consistent with multiple theories of self-control, individuals with higher trait self-control are not only more likely to form intentions to engage in health-related behavior, but are more likely to possess sufficient self-control resources to enact them. They will have greater propensity to engage in the structured planning and reasoned decision making required to convert their intentions into action. Empirical support is needed to corroborate this moderation hypothesis and the proposal that self-control exerts its effects on health behavior through multiple routes.
Hankonen et al. also indicate that trait self-control is less feasible as a target for intervention because it is a stable, dispositional construct and the social-cognitive variables that mediate its effects are eminently more manipulable and ripe for intervention. I concur with this position to some extent; this has been a general view expressed with regard to personality constructs as predictors of health behavior. However, it is important to note that while traits may not be direct targets for intervention, they may be a means to identify “at risk” groups and those that require interventions specifically tailored to their particular psychological profile. The moderating effect of trait self-control on intention–behavior relations may permit the identification of individuals with low self-control who would likely have problems converting their “good” intentions into behavior, so-called inclined abstainers. Practitioners aiming to promote health behavior in that group would do well to introduce interventions that assist them in enacting their intentions such as implementation intentions  or boosting self-control capacity through training . I hope these points will contribute to the ongoing theoretical debate on, and empirical enquiry into, self-control as a key predictor of health behavior and the processes by which its effects are exerted.
Martin S. Hagger was supported by the Australian Research Council Discovery Project Grant DP130103277.
Author’s Statement of Conflict of Interest and Adherence to Ethical Standards
Martin S. Hagger declares that he has no conflict of interest