From the color point of view, green plants are close to the ground and absorb the water on the ground, so they are cold, such as mung beans and vegetables.

From the taste point of view, those bitter and sour foods are mostly cold foods, such as bitter gourd, bitter vegetable, taro, plum, papaya and so on.

From the growth environment, aquatic plants are cold, such as lotus root, kelp and seaweed.

From the geographical location of growth, foods with shadows facing north absorb heavy moisture and rarely see sunlight, so they are cold, such as mushrooms and fungus.

Hot and cold food is also related to the growing season. The food grown in winter is cold because of its heavy coldness, such as Chinese cabbage, mushrooms, white radish and wax gourd. Foods that grow in summer receive a lot of rain, so they are cold, such as watermelon, cucumber, pear and grapefruit.