@TomF @aeva @clacke the biggest problem with BMI is that you divide by height squared. Human bodies don’t scale in two dimensions. (But not in three proportionately either)
So if you’re shorter than average, it will suggest that you’re under weight. And if you’re taller than average then it will say that you’re overweight.
An exponent of 2.3 would fit the data better but that’s just a patch on a broken system.