Obesity and mental illness pose significant global public health challenges, each carrying substantial disease burdens and societal repercussions. Although traditionally addressed separately, recent research highlights the intricate interplay between these conditions. This narrative review examines the potential of public lectures as a platform to address the bidirectional relationship between obesity and mental health. The review advocates for integrated care models and community-based programs, emphasizing the importance of addressing the complex needs of individuals affected by both conditions. Through two case vignettes, it illustrates the nuanced relationship between obesity and mental illness. Public lectures emerge as a readily available and cost-effective tool for raising awareness, promoting behavior change, and empowering individuals and communities to take collective action. The abstract concludes by calling for increased investment and support for public lectures on obesity, recognizing their potential to catalyze meaningful change toward healthier lifestyles.