I think this is hooey, because they are using the Body Mass Index (BMI) as their basis. If you are a tall person with an Arnold body, you will register as “obese” even if your body fat is minimal.
http://en.wikipedia.org/wiki/Body_mass_index#Limitations_and_shortcomings
“Mathematician Keith Devlin and the restaurant industry association Center for Consumer Freedom argue that the error in the BMI is significant and so pervasive that it is not generally useful in evaluation of health. University of Chicago political science professor Eric Oliver says BMI is a convenient but inaccurate measure of weight, forced onto the populace, and should be revised.”
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FAA to Evaluate Obese Pilots for Sleep Disorder
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By
Andy Pasztor
Updated Nov. 20, 2013 8:24 p.m. ET
http://www.wsj.com/articles/SB10001424052702304607104579210580183844434