There are five elements in heaven and earth, and people have five internal organs, and the five internal organs also cooperate with the five elements. In fact, the five elements not only represent the five familiar substances: gold, wood, water, fire and earth, but also represent our five internal organs: heart, liver, spleen, lung and kidney. At the same time, five colors can be derived: white, blue, black, red and yellow. As long as the five-color food is absorbed in every meal, the five elements can coexist, and the five internal organs can be reconciled, thus nourishing the body's function. Red foods include carrots, tomatoes and sweet potatoes. According to the theory of five elements of traditional Chinese medicine, red is fire, so red food can enter the heart and blood after entering the human body, which has the functions of benefiting qi and enriching blood and promoting the production of blood and lymph.

Moreover, red foods have strong oxidation resistance. They are rich in lycopene, tannic acid, etc., which can protect cells and have anti-inflammatory effects. They can also provide protein, inorganic salts, vitamins and trace elements for human bodies, and enhance the functions of heart and qi and blood. Black food refers to all kinds of natural animals and plants whose colors are black or purple and dark brown. In the five elements, black dominates the water and enters the kidney. Therefore, eating black food often can tonify the kidney. Black sesame, auricularia auricula, laver, etc. have high nutritional, health and medicinal values, which can obviously reduce the incidence of arteriosclerosis, coronary heart disease, stroke and other diseases, and have good curative effects on influenza, chronic hepatitis, nephropathy, anemia and alopecia.