As far as the eating habits of China people are concerned, as long as hot dishes are packed into lunch boxes, they must be heated when eating, or they must be stir-fried in China or heated by microwave ovens. Most people in China think that eating cold meals will do harm to their health, especially the gastrointestinal function. Cold dishes and cold meals will not only cause indigestion, but even cause symptoms such as abdominal pain and diarrhea. In addition, food frozen in the refrigerator will breed bacteria, and high-temperature heating can also eliminate viruses and bacteria, so they can feel at ease when eating.

However, the Japanese hardly heat the rice lunch, and they also choose to refrigerate the food. But as long as the food is left at room temperature for a period of time and naturally thawed, it can be eaten directly. Aren't they worried that the gastrointestinal function will be damaged?

In fact, this has something to do with the dishes and eating habits in Japanese rice lunches. Most Japanese lunches are rice balls, sushi and lettuce, which usually don't need to be heated. Just like cold dishes eaten in China, especially sushi and rice balls, Japanese staple foods are all made of cooked food. However, if they are heated again, their taste, taste and shape will be destroyed and their original Japanese flavor will be lost. Lettuce, including fresh processed vegetables and sashimi, is not traditional after heating.

Japanese people's eating habits from ancient times to now prefer to eat cold food. The development of diet is related to living environment and folk culture. Japan is an island country, with seafood as the main ingredient, lettuce and sashimi as the main food types. They are used to cold food, so no matter men, women and children, they will not heat their lunch boxes. Even women who have just given birth and sick patients will eat cold food. Of course, cold food is harmful to the body, but in ancient times, people did not have the ability to heat, and they mainly ate raw food, and their bodies gradually adapted to such eating habits. However, the Japanese also pay great attention to food hygiene, and pay attention to the hygiene of ingredients. Eating raw or at room temperature will not cause gastrointestinal discomfort.

Moreover, the Japanese pay special attention to food etiquette. For countries with such a fast pace of life, eating on the way to school and work is a way to save time. If you eat hot food on public transport, the smell will make the whole carriage filled with a strong smell. In order to avoid this situation, the Japanese will hardly eat heated lunchboxes, in order to create a good and clean public atmosphere.