The healthiest body mass index isn’t as simple as you think
The body mass index (BMI) is a crude but useful measure of how heavy someone is for their weight. It consists of your weight in kilograms, divided by the square of your height in metres. Guidelines suggest that a BMI between 18.5 and 25 is healthy for most people. You are classed as overweight if it is 25-30 and obese if it is more than 30.