The causes of yellowing and thinning hair are different from those of congenital and acquired. According to the clinical symptoms that can be diagnosed on the hair yellowing and thinning: 1, malnutrition yellow hair: mainly caused by a high degree of malnutrition, attention should be paid to the deployment of the diet, improve the nutritional status of the body. Eggs, lean meat, soybeans, peanuts, walnuts, black sesame seeds in addition to containing a large amount of animal protein and plant protein, but also contains cystine and cysteine constitute the main component of hair, is the best food for hair care. 2, acidic body yellow hair: and blood acidic toxins increase, but also with overwork and overeating sweets, fat-related. Should eat more kelp, fish, fresh milk, beans, mushrooms and so on. In addition, more fresh vegetables, fruits, such as celery, greens, spinach, cabbage, citrus, etc. is conducive to the neutralization of acidic toxins in the body to improve the yellowing state. 3, lack of copper yellow hair: in the process of generating melanin in the hair lack of an important copper-containing “tyrosinase”. The lack of copper in the body will affect the activity of this enzyme, so that hair yellow. Copper-rich foods are animal liver, tomatoes, potatoes, celery, fruit and so on. 4, radiation yellow hair: long-term exposure to radiation, such as engaged in computer, radar and X-ray work and hair yellow, should pay attention to supplement food rich in vitamin A, such as pig liver, egg yolk, milk, carrots, etc., and eat more radiation-resistant foods, such as seaweed, high-protein foods, and drink more green tea. 5, functional yellow hair: the main reason is mental trauma, fatigue, seasonal endocrine disorders, drugs and chemicals stimulate the body melanin and melanocyte production disorders. This kind of yellow hair to eat more sea fish, black sesame, alfalfa and other vegetables. Alfalfa in the effective components can copy melanocytes, regeneration of melanin function; black sesame can biochemical melanin original, niacin in the sea fish can expand capillaries, enhance microcirculation, so that the blood smooth, eliminate melanin generation obstacles to the hair to get rid of the yellow and beautiful. 6, pathogenic yellow hair: because of certain diseases, such as iron deficiency anemia and the first recovery from a serious illness, can make the hair from black to yellow. This situation should eat more black beans, walnuts, cumin and so on. Black beans contain melanin-producing substances, which have the effect of promoting the production of melanin. The anisole in cumin helps to transform melanogen into melanocytes, thus making the hair dark and shiny.