BMI – or Body Mass Index – has been the go-to method of measuring what kind of shape we’re in for years now

It works by dividing your weight in kilograms by your height in metres squared – simples.

But now, many scientists are calling for another means of testing because BMI doesn’t take body fat into account.

Muscle is heavier than fat, and so the index has come under fire recently, because some athletes might be considered ‘obese’ when their BMI is taken.

And then there’s the ‘skinny fat’ person, who has little muscle mass but might have a layer of fat around their middle – which is thought to contribute to heart disease and Type 2 diabetes.

Doctors are said to be adopting a new system called the ‘Body Shape Index’ – which takes in your waist measurements too.

The BSI is more about your body’s fat content than your weight.

Another method being tested out is the Body Adiposity Index (BAI), which divides your height by your hip circumference to calculate body fat percentage.

Can we not just judge it by what jeans still fit us?