BMI

[Quindiana Jones]

I get that as a rule of thumb, but it's inaccurate as a measure of health. A person could be classified as "obese" but actually be fit and healthy, with high muscle mass. Perhaps doctors have these limitations in mind when using it, but regular people may not.

It's not inaccurate as a general measure of health, though. The exceptional outliers are known and taken into account, and most people aren't beefcakes, pregnant, very old, or very young. Regular people who care about measuring their BMI and don't know the limitations that may apply for their specific circumstances are dumbbbbbb