The BMI was created by a social scientist to place people into rough categories for a study on how obesity impacts social interactions, in greater research on how the “average man” represented a social ideal. The fact that we now use it to define who is obese and overweight is a little insane. While it’s been adopted by major health organizations (and hopefully adjusted by genuine health professionals), it is a horrible singular indicator of physical health. People in the extremes are statistically more likely to face health issues. This is not the same thing as “being in the obese category makes you unhealthy because you are fat.”