When health warnings backfire: The inverse effect on fast food consumption under different framings

The widespread deployment of forceful health warnings on fast-food advertising assumes that stronger language curbs unhealthy eating, yet empirical evidence is mixed. Drawing on psychological reactance Theory, supplemented by regulatory-focus and construal-level perspectives, this research delineates when and why directive versus factual health-warning frames influence consumers’ fast-food consumption intentions. Across four experiments using a Mainland China student sample in Study 1 and U.S. online adult samples in Studies 2–4 (total N ≈ 1200), we manipulated message framing and assessed choice-based and intention-based responses. Study 1 showed that, in isolation, directive wording can increase purchase intentions relative to factual statements. Study 2 revealed that directive frames consistently heighten psychological reactance, which mediates the framing–intention link and, under baseline conditions, increases desire for fast food. Study 3 identified trait self-control as a boundary condition of the framing effect on consumption intention: directive warnings increased fast-food intention among individuals low in trait self-control, but not among those high in trait self-control. Study 4 identified temporal distance as a further boundary condition: directive messages elevated intentions under a near-future mindset, whereas this backfire effect was attenuated under a distant-future mindset. Collectively, the findings reconcile prior inconsistencies and advance understanding of message framing by specifying dual psychological moderators. More broadly, they offer theory-driven insights into when directive health warnings may backfire.