`  == Environmental causes ==  How can choosing to take less exercise and choosing to eat fast food be considered an ``environmental cause``?  Only if people are not responsible for their own actions.  That obesity is a disease according to some in the rich West is so that drugs can be prescribed!  (You cannot get a drug approved unless it is for a ``disease``.)  Thirty years ago it wasn't a disease!  What's changed?  Personal behaviour.  As the article says:  We eat more, we eat more rubbish, we exercise less.  Doubtless there are environmental causes BUT what are they?   `