Which is a measure of our weight in relation to our height
But is BMI really the best measure for weight/body fat?
Is it a good way to tell if someone's weight is healthy?
Or is it Bogus?
Its far from a perfect measurement and its not an accurate measure of health?
Most Helpful Opinions
The BMI is highly misleading and scientifically bankrupt. You are right to question it.
At its most basic, BMI is a random mathematical combination of height and weight. There is no physiological basis for the formula, it is entirely random. Prima facie, that should be enough to ignore it.
However, a second major issue with BMI, and one that is never discussed, is the blatant fraud of "percentiles". The definitions for "obese", "overweight", etc. for persons 19 and under are defined directly in terms of percentiles of that age group. Adult BMI is indirectly defined the same way. The fraud here is that such percentiles are based on data collected before we landed on the moon, which is of course out of date. In any other instance, using such outdated data would be unacceptable, but it is maintained with the BMI because it allows the mass body-shaming of people. As a stat project, I once made a modernized BMI that corrected this error, and surprise surprise it does not give so many dramatic fear inducing predictions.
The BMI however stays around anyway because it serves as a useful tool for several vested interests. These include a multi-billion dollar weight loss industry, a seedy iron triangle of regulators, the healthcare industrial complex, and various academic research interests that get big grants by predicting disaster. The anorexia obsessed fashion industry and media industrial complex is all to happy to go along with this as a way to shame anyone who is not supermodel thin.
So in a nutshell, the BMI is not worth a plug nickel and has permanently damaged the lives of millions of people, especially young girls, by teaching a dogma of fat shaming and eating disorders as gospel.