Obesity is caused by a mental disorder with a feedback loop brought on by too much gravy in the blood clogging up the brain leading to further retardation.  There is a cure.  It's called the "stop overeating, you fat man-baby" program.  Unfortunately, you can lead a git to weight loss, but you can't make it stop overeating unless it wants to.  And make no mistake; they don't want to, otherwise they wouldn't still be fat.  They want to be thin and fit for sure, but they certainly don't want to stop overeating.  There is a difference.