Clinical obesity in Asian people: bridging the gap between adiposity and disease

This Perspective argues for a reconceptualization of clinical obesity in Asian populations, moving beyond BMI-centric definitions towards an adiposity-based and function-based framework. Asian populations exhibit a distinctive obesity phenotype, characterized by excess visceral and ectopic adipose tissue accumulation, reduced β-cell reserve, sarcopenic obesity and heightened cardiometabolic risk at lower BMI thresholds than for white European and North American populations, leading to systematic under-recognition of obesity-related disease when conventional criteria are applied. Building on the Lancet Commission's framework for defining and diagnosing clinical obesity, we propose an integrated approach that combines anthropometric measures, body composition assessment, metabolic and organ-specific markers and emerging biomarkers to distinguish preclinical obesity from clinical obesity on the basis of organ dysfunction and functional impairment. This approach improves risk stratification, supports earlier and more precise diagnosis and informs stage-specific management, including lifestyle intervention, pharmacotherapy and metabolic surgery, particularly in Asian populations. We discuss implications for clinical practice, prevention strategies and public health policy, emphasizing the need to align clinical guidelines, reimbursement systems and education with a function-based definition of obesity. Finally, we highlight key research priorities, including validation of biomarker-driven classifications, assessment of long-term clinical and economic outcomes and development of scalable diagnostic tools, to advance precision care and metabolic health equity across diverse Asian populations.