And you always thought that BMI was something to do with cheap flying and long waits at check in !
Mazzy, the BMI figure, (the relationship between your height and weight), helps medics and yourself manage risk. (Of heart disease).
The fact that other parameters are normal, works in your favour. I take it that you don't smoke, as you state that you are a fit guy.
Statistically, if your BMI is 20-25, your risk of dropping dead of heart disease early is 1, bmi 25-30, risk is doubled, 30+ and risk is quadrupled.
Of course there are lies, damn lies and statistics ....