I know that as a former "skinny" who worked out almost every day I used to eat far more than I do now.  Since having three children, a full time job, an entire household to run and watching my mother die I have gained some "stress weight".  I do not eat nearly as much as I did when I was thin.  So do we pick on athlets too because they consume more calories.  How about our teenage children.  NO?  Why not if we are going to say that people who consume more cause global warming?   We wont go there because all this really is is another form of predjuice.  Lets get off our high horse and come up with a cure for cancer shall we........

There is also a phonemon, once people become more wheathy than previously, the way of life is changed included also the habit. Due to this matter, people consume more food and their body have tendency  become more fatter.