Carbohydrate counting is a prudent meal planning approach for patients with type 1 diabetes mellitus (T1DM), especially those undergoing multiple daily injections or continuous subcutaneous insulin injections. Carbohydrate counting can make food planning flexible and enjoyable, but limitations exist. This article focuses on how to educate T1DM patients in Korea on carbohydrate counting and how to overcome the limitations of carbohydrate counting.