It is uncommon here in the netherlands. My mom had a gastric bypass when i was very little but even at the age of 7 to 12 i alway felt emberessed when my mom asked for a doggy bag. Even our european sizes were way too much for her. Here it is/was almost concidered a sign of being poor and having no manners. I now think its super cool off her to go against the social stigma and is able to enjoy a restaurant meal for 2 to 3 days.