Rethinking Obesity Prevention: A Call for Strategic and Operational Clarity

Despite decades of initiatives promoting individual behavior change, obesity rates remain high and continue to rise globally, indicating that what is commonly labelled as “obesity prevention” is not, in practice, preventing obesity. While health promotion strategies and policy interventions have demonstrated improvements in environments, health behaviors, and industry practices, their effects on obesity incidence and prevalence remain modest. To examine the mismatch between current obesity prevention practices and contemporary scientific understanding of obesity as a chronic disease, and to propose a reframed approach to prevention. Conceptual analysis informed by empirical evidence and field insights. The authors conceptualize a broad misalignment between scientific understanding of obesity and prevention practice. Current prevention efforts primarily target individual health behaviors and environmental factors related to food and physical activity, rather than addressing the complex causes of obesity. Contemporary clinical guidance defines obesity as a chronic, complex, and relapsing disease characterised by excess or dysfunctional adiposity that impairs health, shaped by biological, genetic, behavioral, and environmental factors. Behavioral interventions produce small changes in BMI and do not reliably prevent the onset or progression of obesity. Evidence demonstrates that behaviors are partly driven by underlying biological and brain-based mechanisms, and that physiological systems resist sustained weight change. As a result, interventions focused primarily on individual behavior are insufficient to prevent a disease governed by interacting biological and systemic processes. Drawing on empirical evidence and field insights, the authors show that prevention efforts are further limited by narrow outcome measures, short-term policy cycles, fragmented accountability, and inconsistent disease classification. Obesity prevention efforts do not align with current scientific understanding of obesity as a chronic, complex, and relapsing disease. Obesity prevention should be redefined to explicitly target disease onset and progression. An integrated, multi-level framework is needed to align health promotion, prevention, and clinical care, addressing biological, behavioral, and system (social, physical, commercial) drivers simultaneously.