Classic observation of kids being skinny but mothers(and fathers) being obese.
There’s a documentary that relates to this problem.
http://www.nature.com/ijo/journal/v37/n8/full/ijo2012185a.html
Also see http://paleoindia.in/globesity-fats-new-frontier-the-poor-are-obese-and-the-rich-are-thin/
and
http://maisonneuve.org/article/2010/11/15/the-diseases-affluence/
