Drinking hot water is a cultural tradition in Japan, with a history dating back to ancient times. It is believed to have health benefits such as aiding digestion and reducing stress, and is often served with meals as a way of showing respect and hospitality to guests. Hot water is also an essential part of Japanese cuisine and is believed to enhance the flavor of dishes such as sushi and soba noodles. In addition, hot springs or onsen are popular in Japan for their therapeutic benefits. Cold water is not commonly consumed in Japan, as it is believed to be harmful to the body.