There are two kinds of spleen deficiency, spleen-yang deficiency and spleen-qi deficiency. What we usually say about spleen deficiency generally refers to spleen yang deficiency, which leads to cold hands and feet, sallow and emaciated, and so on. Spleen is the foundation of the day after tomorrow, with five colors of yellow and five flavors of sweet. Therefore, we should eat more yellow and sweet foods, and recommend several foods: soybeans, yellow sweet potatoes, bananas, eggs, yams and so on.