Could it be regional? In the US, there are localities (like Boulder, CO) where everybody seems to be in shape. It's like they ride the fatties out of town in the sheriff's car like John Rambo.
Then there are other states which are like fucking pork slaughter houses. I have to travel to Cincinnati several times a year and with the ONLY exception of the Westside gym that I go every night that I am there, the local populace are all fucking 300+ heifers. There are many reasons that folks native to Cincinnati call it "Porkopolis"