The five-color card classification of catering represents different nutritional components and functions, as follows:

1. Cyan represents vegetable foods, such as green vegetables, celery and parsley. This kind of food is rich in vitamins, minerals and dietary fiber, which helps to increase the intake of dietary fiber, promote gastrointestinal peristalsis and maintain intestinal health.

2. Yellow: it represents starchy foods, such as rice, noodles and corn. This kind of food is rich in carbohydrates and is an essential energy source for human body.

3. Red: it represents meat, beans and other foods, such as lean meat, tofu and red dates. This kind of food is rich in protein, iron, zinc and other nutrients, which helps to enhance immunity and supplement nutrition.

4. White: representing dairy products and legumes, such as milk, soybean milk and tofu. This kind of food is rich in protein, calcium, vitamin D and other nutrients, which helps to strengthen bones and prevent osteoporosis and other diseases.

5, black: represents seafood, black beans and other foods, such as kelp, black fungus, black beans and so on. This kind of food is rich in protein, iron, calcium and other nutrients, which is helpful for enriching blood and yin beauty.