BMI also seems to have the problem that it correlations are ethnically-dependent. The big outlier are East Asians, who tend to start having obesity-related iss

BMI also seems to have the problem that it correlations are ethnically-dependent. The big outlier are East Asians, who tend to start having obesity-related issues in the upper end of "normal" and have less issues in the upper end of "underweight". Those categorizations were based on statistical studies of Europeans.