1, by category, vegetables belong to one category, and fruits belong to one category.
2. According to the nature, cold is divided into one category and warm is divided into one category.
3. According to the characteristics of eating, there are nuts and peels.
4. According to color, green, red, orange and yellow.
5, according to the health status, heart, liver, spleen, lung, kidney-red, green, yellow, white, black. In other words, red tonifies the heart and yellow tonifies the spleen.
6, according to the size and shape, how to divide.