Millions of people may have been misclassified on the body mass index (BMI) scale, research has suggested.
The scale may have overestimated and underestimated how excess body fat may harm health, according to the study.
The study showed in the UK there might be more than two million people with dangerous levels of body fat missed by the BMI tool.
There may also be more than one million people classed as obese by the index, but who actually have no excess risk, the research suggests.
