Chinese people like to eat dinner at about 6 o’clock, for the old people, they sleep at 9 o’clock, but as the more and more people like to do some activities at night, like to do the square dance, so they will get hungry and find something to eat at night. For the young people, they like to hang out at night, they call their friends out and get together to have fun, so they always choose to eat snack and have a talk. It is obvious that people have activities at night, so they like to eat food. But such life style is not healthy, eating food at night will make people gain weight and do harm to the body. It is better not to eat food late at night.