In the UK doctors will start to treat you if you get to a Body Mass Index of 28 and have another medical condition, such as high blood pressure or diabetes, otherwise they wait until the BMI reaches 30 when the classification is ‘obese’. In France, if you have a BMI of 25 you will be classed as overweight and will be ‘prise en charge’ – monitored and helped, to try to stop you getting to an obese state.