BMI is calculated by dividing your weight in kilograms by your height in metres. If you get a number greater than 25 then it might be time to go easy on the doughnuts.
But who'd have thought as many as 26 Premier League players would also be carrying some extra timber? And that Wayne Rooney isn't one of them?
Named and shamed.
Come on guys, sort it out. You're role-models...