Overconfidence in Managing Health Concerns: The Dunning–Kruger Effect and Health Literacy

Health literacy is often low within the general population. The Dunning–Kruger effect (DKE) suggests that individuals may experience a cognitive bias in which they overestimate their own knowledge base. This study examines the DKE regarding health literacy and health behaviors. A community sample (n = 504) completed questionnaires measuring objective health literacy, confidence in health knowledge, and health behaviors and medical conditions. Results support the presence of a DKE for health literacy; individuals with low health literacy reported equal or greater confidence in health knowledge than individuals with higher health literacy. Individuals with lower health literacy reported more problematic engagement in health behaviors. Low health literacy can impact engagement in health behavior and effect health outcomes, but individuals may not realize this deficit. Implications for clinical intervention include the need to address cognitive bias and enhance motivation to participate in health literacy interventions.