“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”
That’s an extreme case, but the point still stands. For example, right now, I’m pretty fat, because I haven’t shifted the weight I gained over COVID. Even though I’m visibly way larger than I was, I’m not much heavier than I was pre-covid, because I’ve lost a heckton of muscle. It’s insane to me that BMI will look at me pre-covid, and look at me now, and say “that’s the same picture”. Especially because I personally found that the best and safest way for me to lose weight was to focus on getting strong and fit first.