Why does BMI have units of kg/m^2 when we are three dimensional? Wouldn’t kg/m^3 or g/cm^3 be more accurate?
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Just because something has a unit doesn’t mean it’s the unit that we’re used to thinking about. It’s your mass compared to your height squared, not your surface area or body cross-section area. As the top comment says, the ratio of your height squared to your mass seems to have some sort of correlation to health.
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