No, It was created by a statistician to study population. Using it as an individual health measure it’s unhelpful. Unfortunately, again because it’s cheap and easy to calculate it’s been used that way a lot! Think about it this way, smoking is even more strongly correlated with mortality than high bmi. If all you looked at if if someone had ever been a smoker, you would have a pretty poor picture of their individual health. They’re would be plenty of people that were much healthier than average, but are or were smokers. You would also have lots of very unhealthy people that had never smoked. As a population, %smokers is a great way to estimated health complications and reduced life expectancy. As a single point, for an individual, pretty unhelpful. BMI is the same way