There is a lot of good points in this post.
I have been immersed in the eating disorder community for the last 4 years. And let me tell you bruthas, there is a fair amount of absolute craziness abound.
There is some pushback on BMI, that it is outdated and is not an accurate measure of health. To a certain extent, that is correct. But, the anti-BMI crusaders cannot come up with a valid, objective measure to replace it.
Then, there is the Health at Every Size (HAES) crowd. Good Lord! Try to discuss intelligently with them, their views and they burn down your house.
I do know in the next 3 - 4 months, a research study is going to be released showing a genetic predisposition to eating disorders among some obese people ... but not all obese people. That is going to start a shit storm.
But, genetics cannot be ignored when discussing obesity.
Now... continue on with the Surly type discussions.