Reason One)
It does not take into account muscle mass. So, if you are extremely fit, it will categorize you as over weight. If you have no muscle mass, it will categorize you as underweight. When in both cases you may be a perfectly normal weight.
Reason Two)
The guy that invented it specifically said it was not meant to be used as a healthy-or-not measurement. Just to categorize the population for counting
Reason Three)
Does not take into account bone mass, either. Think about it. We all know people that have really large bones, and some with very small bones. Does the formula know the difference? It does not.
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