Swiss or Scandinavians are less obese/overweight than, say, Slovakians or Hungarians.
The same can be said about US north easterners from Boston/NY being generally more fit than a random person from Florida/Alabama.
This is a world wide trend. The "new rich", those that used to be poor and hungry but now have access to food and easy transportation (and less physically demanding work), but not rich enough to access sport, leisure and education, are generally less fit.
This cuts across geographical and racial boundaries.