Perceived Genetic Risk and Dietary Prevention Beliefs Among Offspring of People Living with Dementia: A Mixed-Methods Study Guided by the Health Belief Model

Background: Given the rising global prevalence of dementia and its complex etiology, involving genetic and environmental risk factors, the aim of the present exploratory study was to investigate how offspring of individuals with dementia perceive genetic risk and the role of diet in dementia prevention. Methods: A mixed-methods study was conducted in Greece. Overall, 118 offspring completed an online questionnaire assessing demographics, risk perceptions, and dietary beliefs and practices in dementia risk reduction. Additionally, 22 semi-structured interviews explored dietary beliefs, practices, and influencing factors using framework analysis. Results: Most participants (76.3%) recognized diet’s role in dementia prevention, while 52.5% perceived offspring as having increased genetic risk; 40.7% reported making dietary changes to reduce disease risk. Healthcare professional consultation was the factor most strongly associated with dietary modification (OR = 26.61, 95% CI 7.47–94.76, p < 0.001). Qualitative findings showed that, while dementia was viewed as severe, personal susceptibility was often perceived as uncertain or distant. Key barriers, facilitators, and the role of self-efficacy in adopting healthier dietary practices were also explored. Conclusions: Our findings identify personalized dietary counselling and risk communication as priorities for evaluation in future intervention studies, aimed at supporting the implementation of dietary modifications and reducing the gap between knowledge and behavior in dementia risk reduction.