Conformity

Below, yet another YouTube uptake on the obesity issue.
There is an interesting element here. At one point,  a sociologist
of the body discusses the history of the pre-occupation with  the
overweight. He points out - and this is true for me as well - that in his childhood,
there were just some people who were 'des gros'. Nobody expected them to
change, body was destiny and they were accepted for who they were.
But then something happened in the late 1980s: all of a sudden, fat people
were expected to want to join the thins. And it would be morally corrupt of them
not to.

The program doesn't directly answer why or how this happened, but did
point out how - all of  sudden - people were taking planes everywhere and interacting
in public as never before, often then, as strangers. This might be part of the answer
as to how grossophobia came to be so prevalent. It is now a much smaller world, 
and body conformity is expected.