I'll help you out of that dream!!! The european waist is growing just as rapidly as the US. The only difference is that McDonalds and all those bad food providers got here later. Waist size wise the Europeans are where the US people were 10 years ago. So we look thin.
I'm 15 pounds overweight but am still one of the smallest people in my home town!!!
What we do different is that many europeans get more exercise. In other parts of the world, especially north America, everybody takes the cars for even small distances. Here we ride the bike to school or we walk. To work only those who need a car for appointments come by car, the others come by bike.
Grocery shopping most do once a week by car, get the big stuff and get the smaller stuff by bike.
We europeans tend to walk and bike a lot.