National Granola Bar Day is observed every January 21 worldwide, celebrating the delicious and convenient snack of granola bars. Granola, a mixture of rolled oats, nuts, seeds, and dried fruits, was invented in the mid-19th century by Dr. James Caleb Jackson, who offered it at his health spa in New York. The popularity of granola bars, which are made by mixing granola with a binding ingredient and pressing it into bar shapes, has grown significantly, especially among outdoor enthusiasts and those seeking quick, nutritious snacks. While granola bars are often marketed as healthy, many can be high in fat and sugar, so consumers are encouraged to check ingredient lists carefully. To celebrate, people can try various granola bar brands, make their own at home, or share their favorite recipes and brands on social media using the hashtags #GranolaBarDay and #NationalGranolaBarDay.