The issue has been controversial. Obesity is usually measured by body mass index (BMI) – a ratio of weight against height. It is generally agreed to be imperfect because athletes and very fit people with dense muscle can have the same BMI as somebody who is obese.
‘Metabolically healthy obese’ are 50% more likely to suffer heart disease than those of normal weight, finds University of Birmingham study
Source: No such thing as ‘fat but fit’, major study finds | Society | The Guardian
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