I wrote a paper that discussed why body mass index wasn’t an accurate measurement of anything.
To get an idea of why I feel this way, let’s use some professional athletes to illustrate why BMI is not an accurate measurement of obesity:
This is a link to the roster of the Tampa Bay Lightning, a professional hockey team made up of athletes from all over the world, most of whom are also on their country’s respective Olympic teams. They are provided, as part of the team, with a full time nutritionist, the best medical care available, and they each work out 6-8 hours a day, every day. In other words, they are in the 99.9th percentile of health and fitness. According to Body Mass Index, every one of them has a BMI higher than 25, meaning that all of them are overweight.
In science, if you can prove that a hypothesis isn’t always correct, then it must be rewritten or discarded. BMI isn’t correct.
Now the American Medical Association now agrees that BMI isn’t accurate. Not because of its inherent issues, but now because they claim it is racist.