Blue food corresponds to the wood in the five-color line and enters the liver, which can enhance the qi of the viscera. The liver is an organ that detoxifies, so blue food has the function of clearing liver and detoxifying, such as peas.

Red food corresponds to the five elements of fire and enters the heart, which can enhance the qi of the heart and improve the activity of human tissues and cells. Eating more red food can prevent colds and has the effects of clearing blood, enriching blood and promoting blood circulation, such as red dates and red beans.

Yellow food corresponds to the soil in the five elements and enters the spleen, which can enhance the qi of the spleen, promote and regulate metabolism, and improve the function of viscera. Such as soybeans, peanuts, millet, corn and so on.

White food, such as white rice, coix seed, almond, etc., corresponds to the gold in the five elements and enters the lung, which can enhance the lung qi.

Black food corresponds to the water in the five elements and enters the kidney, which can enhance the qi of the kidney and has the functions of health care, beauty, anti-aging and cancer prevention. And it is also of great benefit to the excretory system, such as black rice, black sesame seeds and black beans.

See Baidu's "Five Grains and Five Colors Theory" for details.