Literally speaking, light food refers to small food, which can be understood as porridge, steamed buns, jiaozi, spring rolls, steamed dumplings, fruits, cakes, biscuits and other snacks. More importantly, a sushi, a lettuce salad or a hamburger can all be regarded as light food. Therefore, a small amount of food that can be enjoyed during non-dinner time, such as "drinking tea" in China and "afternoon tea" in Europe, can be called light food. So another meaning of light food is simple food that can be eaten without spending too much time. From yogurt and lactic acid catering to all kinds of healthy, delicious, fresh and light foods developed by convenience stores and mass shopping malls, modern people can have balanced nutrition in fast food, eat easily, lightly and with low calories, without increasing their physical burden. These can all be classified as light food.