YSK that there's a better index than the BMI to measure obesity called the Body Roundness Index
Aatube@kbin.melroy.org to 
nytimes.com
"The body mass index has long been criticized as a flawed indicator of health. A replacement has been gaining support: the body roundness index." Article unfortunately doesn't give the freaking formula for chrissakes; it's "364.2 − 365.5 × √(1 − [waist circumference in centimeters / 2π]2 / [0.5 × height in centimeters]2), according to the formula developed by Thomas et al.10"
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It's incorrect, it claims my body fat is 19% when I know for an absolute fact it's 22%.
Much better estimate than BMI innit?
I think interestingly enough it's inaccurate in the other direction. While BMI is will call people unhealthy if they have a lot of muscles, this will call people healthy if they are like me severely underweight.
My roundness index claims it's in the healthy zone while in reality my weight is unhealthy.
How do you know you’re unhealthy?
I'm currently receiving treatment for onset osteoporosis caused by malnutrition. Also it's kinda obvious your weight is probably not healthy when your ribs are sticking out.
looking it up, BRI ranges from 1 to 16, but somehow there isn't an accepted definition of underweight