BMI was never intended to assess the health of individuals. It is a marker for assessing or comparing populations.
For example:
- If you have 1000 people in a room, BMI will do a good job of telling you how many are obese by various definitions of obesity based on health/symptoms/physical function.
- It will not do a good job of telling you which of those 1000 people are the obese ones.
Thanks and good luck.