Pork has been consumed in Japan for centuries, but it hasn't always been popular. In ancient times, pigs were considered unclean animals and were primarily used for labor rather than consumption. However, pork began to gain popularity as a food source after the Meiji Restoration in 1868. Pork is not as common in Japanese cuisine as seafood or rice, but it still plays an important role. Despite its popularity, there has been a decline in pork consumption in Japan due to health concerns. As a result, many Japanese people are turning to healthier alternatives such as chicken and fish.