FWIW, Russian kids are probably familiar with blood products. We have a treat called hematogen bar for people with anemia. It's made out of cow's blood and quite tasty, so non-anemic kids eat it anyways.
Though a large part of Swedes, both children and adults, refuse to eat blodpudding. Id say this food culture is hanging on by a bare thread, and will probably disappear in a few generations.
I'll probably end up with anemia if my body becomes accustomed to my bloody diet but oh well. I'm already dependent on caffeine and nicotine so one more thing won't make that much difference.