Defining disease or delaying care? A conceptual and clinical appraisal of the Lancet obesity framework

The Lancet Diabetes UK Biobank) demonstrate elevated risk among individuals classified with "preclinical" obesity and even higher risk among those with "clinical" obesity, underscoring the importance of safeguards against undertreatment in the preclinical state. At the same time, lack of standardized anthropometric measurement protocols, increased resource utilization, limited distinction between subcutaneous and visceral fat depots, and insufficient data regarding the long-term implications of obesity-related disease absence prompted the ES to pause before fully endorsing the Commission's consensus. Accordingly, we outline an evaluation framework addressing available evidence, feasibility, coverage and equity considerations, and clinical impact. We advocate harmonization with established staging systems (EOSS, EASO), explicit measurement protocols, age-, sex-, and ancestry-specific thresholds, integration of mental health and patient-reported outcomes, and policies that prevent unintended care restrictions. The Commission's reframing represents a meaningful conceptual advance; broader adoption will require practical and equitable implementation.