New clinical definition outperforms BMI in diagnosing obesity
A new international study suggests that a diagnostic framework focusing on organ function and body fat distribution is more effective than BMI for identifying obesity-related health risks. The research aims to address the limitations of BMI, which often fails to accurately reflect an individual's actual health status or body composition.
Why it matters
This shift could fundamentally change how medical professionals diagnose and treat obesity, moving away from simple weight-based metrics toward more personalized, health-focused assessments.
edited by Sadie Harley , reviewed by Robert Egan
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Add to Preferred Sources Credit: RDNE Stock project from Pexels A new diagnostic definition of obesity outperforms body mass index (BMI) in identifying differences in health and prognosis, including mortality risk, according to a large international study published in Nature .
The research, led by King's College London, tested the diagnostic framework proposed by a Lancet Diabetes & Endocrinology Commission in January 2025 to address worldwide concerns that reliance on BMI alone may be causing millions of people to be misdiagnosed.
The new definition was designed to improve identification of excess body fat and distinguishes clinical from preclinical obesity based on its impact on organ function and daily activities.
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