Comfort food isn't really about nutrition — it's about nostalgia and that satisfying, heartiness that reminds people of home cooking or childhood. Researchers who study this say the appeal is as much psychological as it is about taste: warm, carb-heavy, familiar dishes trigger genuine feel-good responses. These three are some of the most-craved comfort foods worldwide, each rooted in a different culinary tradition — Italian, Japanese, and American. On a cold, rainy day, which one would actually get you off the couch?