BMI Underestimates Obesity in Young Women

So it is not as rosy as we think.

Body mass index thresholds for obesity miss nearly half of reproductive-age women who meet the criteria by percent body fat, researchers found.
Taking into account race or ethnicity could boost the accuracy of BMI in this group, said Mahbubur Rahman, MD, PhD, MPH, and Abbey B. Berenson, MD, MMS, both of the University of Texas Medical Branch in Galveston.

BMI is still the best indicator of fatsoness there is.

This approach of including additional data may make it even better.

And demonstrates that the situation is even worse.