Modern health care believes that dark vegetables are rich in calcium, iron and vitamin B2.

Common dark green vegetables are: spinach, rape, celery leaves, water spinach, mustard, broccoli, chrysanthemum morifolium, leek and radish sprouts.

Common red and orange vegetables are: tomatoes, carrots, pumpkins, red peppers and so on.

Common amaranths are: red amaranth, purple cabbage, water shield and so on.