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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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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A body with the least surface area and the most mass (density is constant) will be a sphere. Therefore, BMI measures how much of a sphere you are.

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