Just remembered a couple more things, prompted by other posters' comments.
Yes, bigos, meatballs with red or white cabbage and onions was tasty and low carb. One tip is to ask a local person how to pronounce some useful words. Before travelling to Poland, I met up with a Polish colleague to ask them how to pronounce eg names of towns, as I knew I would need to buy bus and train tickets. However, he suggested that some names were so difficult for a non native speaker, that he suggested writing them down or showing a map. He helped me pronounce a few words eg please, thank you, does that contain sugar? etc.
Hotel buffets throughout Europe often include cold meat, cheese, yogurt etc, which are generally lower calorie than English / Scottish / Welsh / Irish cooked breakfast items on UK / Irish hotel buffets. Even for those committed to low carb eating, treat of a single local bread roll is surely part of the pleasure of travelling?