Middle-aged and elderly people can often eat purple rice, black beans, red beans, green beans, Hong Ling, black sesame seeds, walnuts and other staple foods. They can also eat more meat such as black-bone chicken, beef and mutton, pork liver, soft-shelled turtle, dark fleshy fish and sea cucumber. In addition, middle-aged and elderly people often eat carrots, spinach, purple radish heads, purple cabbage, mushrooms, black fungus and so on. In short, all dark foods contain pigments, which is conducive to the maintenance of hair color.