Slimboy Fat: The Problem with BMI

Dr Mark Porter puts the BMI, or bodymass index, to the test. BMI calculates whether someone is too fat,too thin or just right but how accurate is it?

As a man of a certain age Mark's aware that his waistband is getting tighter but assumes it is only a statistical aberration - probably. He compares his results with other measures of body fat and discovers hidden risks.