The BMI was designed to look at whole populations (45-year-old men, for example, or 24 year old women) for insurance purposes. For those purposes, it's a great snapshot of healthy and not-so-healthy weights and for recognizing changing weight trends within those populations.
It isn't and was never expected to be a measure for individuals. But it's an easy measurement to find and use, and so it was used more and more.
For me, I'm not worried about whether it's accurate. I KNOW I'm morbidly obese, and will be for many more pounds to go. It's really only those folks who are very active and muscular that show with higher BMIs than they should. I'm nowhere near them.
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