New obesity test avoids BMI misdiagnosis for millions globally
Doctors propose a new diagnostic method that combines body mass index with waist measurements to prevent misclassifying millions of adults as obese or healthy.
Study uses records from four nations
Francisco Rubino, a professor at King's College London, led the research using health data from over 800,000 people. The team gathered records from the UK, US, China and Spain to track health for up to 15 years. Their analysis suggests current BMI definitions miss obesity in 5-9% of adults while wrongly diagnosing it in as many as 3%. This approach allows clinicians to distinguish between healthy individuals and those with harmful excess body fat who share the same weight-to-height ratio.
New criteria define clinical disease stages
Under the new definition, a BMI over 40 is considered obese regardless of other factors. For lower BMIs, doctors check waist measurements exceeding 102cm for men or 88cm for women to confirm obesity. The method also separates pre-clinical obesity from clinical obesity where organ function is already impaired. It is reassuring that between 80% and 90% of individuals with pre-clinical obesity will not advance to an active condition over the upcoming ten years.
Diagnosis becomes more complex for staff
Rubino noted that while the process adds complexity, diagnosis must occur at the individual level rather than relying on population averages. Some people with high BMIs were found to have lower mortality risks than others considered healthy under old rules. The Lancet Commission report proposed this framework last year before scientists published their findings in Nature journal.
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