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and one millionare and one person with no money have an average income of a half a million dollars. OF COURSE if you throw all the severely overweight people out of the sample and leave IN all the SEVERLY UNDERWEIGHT (few as they are) you will distort the health picture to favor the mildly overweight. If however you look at cohorts of people WHO HAVE THE SAME PERCENTAGE OF BODY FAT and compare them you will find that any significant excess fat is associated with poorer health (anorexics obviously have poor health too), and besides a person who waddles around and needs a lot of help to manage their life because they are too fat and their joints wore out may live as long as someone who isn't in this position but can you reasonably say they are equally healthy. Obviously a woman who stops being fertile is too thin, but this is like the alleged inaccuracy of the BMI; you can be pretty much guaranteed that for anyone who has a personal motive to bring it up it is NOT innacurate.