Chinese medicine has: "Red enters the heart; Green enters the liver; Yellow enters the spleen; White into the lungs; Black enters the kidney, so red, green, yellow, white and black all refer to those foods? Red food such as watermelon, tomato, strawberry, cherry, red pepper, etc. Green food such as spinach, celery, green pepper, broccoli and black fungus. Yellow food, such as potatoes, chestnuts, wheat, egg yolk, etc. White foods such as pears, sugar cane, tremella, water chestnuts and black foods such as black fungus, black sesame seeds, black beans and black rice. This is my answer to your question. Thank you.