&gt;BMI is such a stupid, useless metric.<p>Yes, but it makes it trivial to get a good p-value, so people use it.  The state of nutritional epidemiology is abysmal, and has been for much longer than that of social psych.<p>The thing is, we have better measures than BMI, many of which are dead simple (e.g. % body fat as measured by calipers, or waist measurement).  I also wish nutritional epidemiologists would stop using linear models all the time -- it&#x27;s well known that mortality curves are U-shaped, as excessively thin people have high rates of all-cause mortality.<p>Returning to your original point, I&#x27;m 6&#x27;3&quot; and 220 lbs.  I have 12% body fat.  Somehow this makes me fat, according to BMI.