Calling people obese is medically "flawed" - and the definition should be split into two, a report from global experts says. The term "clinical obesity" should be used for patients with a medical condition caused by their weight, while "pre-clinically obese" should be applied to those remaining fat but fit, although at risk of disease.

New recommendations on how to define obesity would reduce the emphasis on body mass index and also take into account health problems from extra weight and other measurements

More than a billion people are estimated to be living with obesity worldwide and prescription weight-loss drugs are in high demand. The report, published in The Lancet Diabetes &