Diagnosing clinical obesity (Lancet Commission 2025)
Also known as:
Clinical vs preclinical obesity
Applying the Commission's framework: confirm excess adiposity, then look for organ dysfunction or functional limitation.
Written and reviewed by Farhan Tahir, MD · Last reviewed
VIDEO LESSON
Step 1: confirm excess adiposity
• BMI alone is a screening tool, not a diagnosis
• Confirm with at least one body-size measure (waist circumference, waist-to-hip or waist-to-height ratio) or direct fat measurement such as DXA
• At very high BMI (above about 40), excess adiposity can be assumed
Step 2: assess for clinical obesity
Clinical obesity requires objective signs of organ or tissue dysfunction attributable to adiposity, or limitations in activities of daily living. The Commission lists adult criteria spanning cardiorespiratory, metabolic, hepatic, renal, musculoskeletal and other systems.
Implications
• Clinical obesity: treat as an active disease with evidence-based therapy
• Preclinical obesity: risk reduction, monitoring and prevention of progression
Key studies and references
Educational content only, written and reviewed by Farhan Tahir, MD. It does not replace individual medical advice. For sudden chest pain, trouble breathing or stroke symptoms, call 911.
AT A GLANCE
Section
Diagnosis & risk
Also known as
Clinical vs preclinical obesity
Reviewed by
Farhan Tahir, MD
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