Japanese people eat bento when not heated, directly eat cold, which has a lot to do with Japan's living habits, eating habits as well as and Japanese people's sense of saving. On the contrary in China, as long as it is not a hot meal, or in exchange for a cold bento, such a business will often be unattended also rude.

First of all, the Japanese people's sense of space and saving consciousness is very strong, these and the lack of local resources in Japan and as an island country's geographic location is inseparable, heating the bento may waste time, but also a waste of electricity or other resources, eat cold bento is more in line with the Japanese people's life requirements, it can also be said that the Japanese poor. At the same time, Japan also has the habit of eating cold food, just as many small children in Japan wear shorts in winter, which is also due to their living habits, and can not be changed for a while.

Secondly, when Japanese people eat bento, a lot of bento type of food is not suitable for heating, such as Japanese people's nori rice balls, if heated not only the outside of the nori will be deformed, but also the flavor will be mutated, affecting people's appetite, which may result in a waste. In fact, the Japanese are not entirely in the cold rice balls, careful people will find that the Japanese people generally eat cold lunch, will drink hot tea, used to moisturize the balance. Like a lot of sushi restaurants, are cold sushi and hot tea combination, which is a standard, sushi is the need for low temperature to taste, once heated to feel difficult to swallow, so the cold rice to become tasty is also a Japanese "invention", but also the Japanese think that eating a cold lunch box does not heat up the more nutritious food can be preserved.

Once again, the popularity of the Japanese bento and Japan's geographic location is also related to the backwardness of Japan's technological development at the time, Japan is in an island country, if you need to survive, you need to rely on the sea, and often go out to sea fishing food due to the lack of advanced science and technology is generally very difficult to save, in the sea to prevent the rice ball rancid will be added to the vinegar, similar to the use of a fermentation, and then catch the fish will be placed on the rice ball, which is the traditional primitive sushi! Then, when they catch fish, they put it on the rice ball, and this is the traditional original sushi. At the same time, when the Japanese were marching to war, they rarely cooked and brought their own rice balls similar to bento, which is perhaps a historical tradition that the Japanese ate bento without heating.

Lastly, the Japanese people's bento are not all cold at present, the big winter, if too cold, a lot of bento still can't eat, to avoid discomfort to the body, there are also a lot of bento convenience stores, will be opened next to the convenience store to put a microwave oven on the area for self-heating, so that both the general public can be convenient, but also can save a lot of time in the convenience store to buy a bento! The time to buy a bento at the convenience store.