3. The reason of become small. Why is Sushi becoming small? there were 2 reasons. First, in the late 19th century, Refrigeration technology became widespread, making it easier to preserve fish. So there was no longer a need to make large sushi. However, the critical Factor was the post war food situation. After the war rice was in short supply and sushi restaurant had no choice but to serve smaller potions of rice. However these small pieces of sushi were well received as being “easy to eat in one bite” and this style became established. In other words technological advances laid the foundation, and the post war rice shortage was the trigger that pushed the size to current form. Correct the pronunciation and text, please, thanks.