New Clinical Definition Beats BMI in Obesity Diagnosis
A new international study published in Nature proposes a diagnostic framework for obesity that moves beyond BMI. This method incorporates body fat distribution and organ function to better identify clinical health risks.
Why it matters
This shift could fundamentally change how medical professionals diagnose and treat obesity, potentially improving health outcomes for millions misclassified by BMI.
A new diagnostic definition of obesity outperforms 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 pre-clinical obesity based on its impact on organ function and daily activities.
The research was undertaken in collaboration with Huazhong University of Science and Technology, Kailuan General Hospital, and North China University of Science and Technology in China; Pennington Biomedical Research Center and the University of Colorado Anschutz in the United States; the University of Girona in Spain; and Universit Cattolica del Sacro Cuore in Italy.
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