Someone on a previous post already mentioned that this notion gained ground in the 1990s predominantly in Sweden, and if you look at the discussions around the "study" youll see that its far from everyone who feels like this is accurate, as well as many ways of interpreting what being fed means.

I as a danish person have never experienced not being offered food or beverages, and have always been offered to participate in main meals of the day. In fact the Danish concept of a "Soenderjysk kaffebord" is basically the idea of feeding your guest and ongoing feast throughout a day. Contrary to this study, Ive always been taught its rude to not offer your guests food.

So take this information with a grain of scepticism.