In detail, compared with the traditional diet, the light diet has three characteristics: first, it is simpler and time-saving, unlike the traditional diet, which has a series of processes such as preparing ingredients and decocting. It may take several hours to cook a meal, but it only takes ten minutes or even a few minutes to cook a light diet. For example, a lunch sandwich is a typical light food, which is relatively time-saving. The second aspect is that in terms of food quantity, the quantity of light diet is not particularly large. The main purpose is to satisfy people's hunger and thirst, supplement nutrition and energy, rather than overeating and overnutrition, which is also in line with the current concept of pursuing a healthy diet. The third aspect is that the light diet bid farewell to the traditional diet of big fish, big meat and high fat, but chose healthy ingredients with high protein, low fat and high fiber, which made the nutrition more balanced. It is precisely because of these characteristics of light diet that it has been favored and welcomed by the majority of white-collar workers and petty bourgeoisie. As a result, many catering franchise brands have seen this popular trend and have developed in the direction of light diet. Now all kinds of lunches, sandwiches, hamburgers, pies, etc. The platform outside is very popular with everyone. These are representative foods of light diet. With the further popularization of light food, more and more catering brands participate in the development of light food, so there will be many food categories that conform to the concept of light food, which will bring us more rich and diverse choices.