"Black food" mainly refers to grain, oil, fruit, vegetables and fungus food containing melanin and black characters. Commonly used black foods include: black rice, rye, purple rice, black Qiao Mai, black beans, black lobster sauce, black sesame, black fungus, black mushroom, laver, Nostoc flagelliforme, kelp, black mulberry, black jujube, chestnuts, longan pulp, black grapes, black pine nuts, black-bone chicken, black sea cucumber and black ant dish. Modern medicine believes that "black food" is not only rich in nutrition, but also has many unique effects such as tonifying kidney, anti-aging, health care and longevity, preventing and treating diseases, blackening hair and beautifying face. A large number of studies show that the health care function of "black food" is not only related to its three nutrients, vitamins and trace elements, but also the melanin contained in it has played a special positive role. For example, the functions of melanin are: 1, scavenging free radicals in the body; 2. Antioxidant and hypolipidemic effects; 3. Anti-tumor effect; 4. Beauty function; 5. Promotion of sexual function. This may explain why "black food" is popular in today's world. The nutrition and health care function of black food is very obvious. According to the determination, black rice contains 18 kinds of amino acids needed by human body, and also contains high contents of trace elements such as iron, calcium, manganese and zinc and natural pigments. Regular consumption can significantly increase the content of hemoglobin and hemoglobin in human body, play a health care role in cardiovascular system, and be beneficial to children's development, brain strengthening and rehabilitation of women with weak constitution. Food experts believe that black food not only gives people a simple, strong and strong appetite, but also has been proved by clinical practice that regular consumption of these foods can regulate human physiological function, stimulate endocrine system, promote saliva secretion, promote gastrointestinal digestion and enhance hematopoietic function, increase hemoglobin content, nourish skin, beautify hair and delay aging. Scientific research has confirmed that 24 kinds of black foods have anti-cancer effects, among which soft-shelled turtle, dark plum, sea cucumber, black jujube, black fungus, soy sauce and squid ink are the best. According to analysis, soft-shelled turtle (also known as soft-shelled turtle) contains a lot of enzymes, and the number of white blood cells in its blood is even more amazing. Scientists fed fish meal to mice inoculated with cancer cells, and fed mice with 500 grams of fish meal every day. After 30 days, the tumors of cancer cells decreased by 30%. The researchers also found that turtle shell also has anti-cancer effect, which is very suitable for cancer patients. Mume is made from Qingfei Decoction, which can improve the lymphocyte transformation rate of tumor patients and is suitable for cervical cancer, nasopharyngeal cancer and rectal cancer. Sea cucumber is a tonic. Stichopus japonicus mucopolysaccharide extracted from Stichopus japonicus has certain curative effect on many cancers, especially adenocarcinoma. Black dates are rich in vitamins, which have a strong effect on enhancing immunity in vivo, and have obvious curative effects on cardiac cancer, lung cancer and hematemesis. Regarding the anticancer effect of soy sauce, scientists used two groups of mice as control experiments. After eating a carcinogen, the cancer rate of the group that ate soy sauce for a long time was significantly lower than that of the group that did not eat soy sauce. Auricularia auricula is suitable for inhibiting cervical cancer and vaginal cancer in women. The anticancer effect of squid ink is that it can enhance the defense function, thus improving immunity and killing cancer cells. Black rice with cuttlefish juice has become a popular diet in Italy and Spain. Black rice has the functions of nourishing yin and tonifying kidney, invigorating spleen and warming liver, enriching blood and benefiting qi, improving intelligence and strengthening brain, enhancing metabolism, improving eyesight and promoting blood circulation, treating juvenile gray hair and nourishing deficiency of pregnant women and parturients. It has therapeutic effect on anemia, hypertension, neurasthenia, chronic nephritis and other diseases. Trace elements such as vitamin B 1 (twice that of ordinary rice), B2, B6, B 12, iron (seven times that of ordinary rice), calcium, phosphorus, selenium, magnesium, copper and zinc are all higher than those of ordinary rice. The protein content of purple-black wheat is 6 times higher than that of ordinary wheat, and the contents of calcium, phosphorus, lysine, selenium and vitamin K are 3 times higher than that of ordinary wheat. Black Qiao Mai is rich in nutrition, with protein content of 13% and fat content of 3%, among which oleic acid and linoleic acid are quite high. In addition, it is rich in vitamins P, B 1, B2, VE and trace elements such as magnesium, iron, calcium and copper, which are many times higher than those of cereals, especially the trace element copper ranks first among all kinds of cereals. Black Joe Michael, as a medicine, has the effects of resolving food stagnation, stopping sweating and diminishing inflammation. Because it is rich in oleic acid and linoleic acid, it can reduce blood lipid and prevent cerebrovascular bleeding. In addition, it also contains chlorophyll, rutin and nicotinic acid. Rutin can reduce capillary permeability, strengthen the role of VE, and promote the accumulation of VC in the body. Nicotinic acid can dilate small blood vessels and lower cholesterol. Black Qiao Mai is also used to treat hypertension, control diabetes, improve vision, and prevent and treat cataracts and retinitis. Black beans have the functions of nourishing liver and kidney, strengthening bones and muscles, warming stomach, improving eyesight and promoting blood circulation, inducing diuresis and detoxicating, and are also the best products for moistening skin, blackening beard and blackening hair. Black beans are rich in vitamins, egg yolk, riboflavin, melanin and hormones called "vitamins". Among them, B vitamins (B 1, B2) and VE are very high, and only VE content is more than 7 times that of meat, which plays a great role in human nutrition and health care, anti-aging, beauty beauty and vitality enhancement. Black lobster sauce is widely used in medicine, mainly used for headache, cold and heat, miasma, irritability, chest tightness, fatigue, asthma and cough, cold pain in feet, hemostasis and dysentery, abdominal pain, fetal poisoning, infantile head sore and so on. Eating lobster sauce for the elderly can effectively prevent the formation of cerebral thrombosis, thus strengthening blood vessels, maintaining cerebral blood flow and preventing and treating Alzheimer's disease. Black sesame has the functions of nourishing liver and kidney, nourishing brain and moistening lung, nourishing blood and blackening hair, strengthening bones and muscles, and preventing aging. It is a commonly used tonic. Modern research has proved that black sesame is rich in oleic acid, linoleic acid, lecithin, vitamin E, protein, calcium and iron. Its oil content is as high as more than 50%, especially vitamin E, which is the highest among plant foods. It can prevent the harm of lipid peroxide to human body, offset or neutralize the accumulation of "free radicals" in cells, and has the effects of delaying aging and prolonging life. In addition, it can also reduce thrombosis and prevent atherosclerosis and coronary heart disease. Auricularia auricula has the effects of benefiting qi and enriching blood, cooling blood and stopping bleeding, moistening lung and calming nerves, clearing stomach and intestines, blackening hair and caring skin. According to Dr. hammersmith from the Medical College of the University of Minnesota, Auricularia auricula has the effects of preventing platelet aggregation and cholesterol deposition in the blood. Patients with arteriosclerosis, hypertension and coronary heart disease and middle-aged and elderly people often take it, which can reduce the occurrence of cerebral thrombosis and myocardial infarction and prevent stroke and coronary heart disease. Auricularia auricula can not only enrich blood, but also cool blood and stop bleeding. It has the effect of treating both symptoms and root causes of menorrhagia, hemoptysis, hematemesis, massive hemorrhage and hemorrhoid hemorrhage. Auricularia auricula has a strong colloidal adsorption, which can digest fibers and absorb intestinal residues, thus cleaning the gastrointestinal tract. The lipid component of auricularia auricula contains nucleic acid and lecithin. Modern scientific research shows that it has the effects of bodybuilding and beauty, delaying aging and prolonging life. Therefore, Auricularia auricula is deeply loved by consumers at home and abroad and enjoys the reputation of "vegetarian food and good meat". The rise of "black food" reflects people's pursuit of nutrition and health care. Of course, although black food is nutritious and beneficial to the body, it also needs to prepare other pigment foods. White food such as rice and noodles can provide protein, heat and so on; Pumpkins and potatoes in yellow vegetables, tomatoes, carrots and red peppers in red vegetables, celery, spinach, water spinach and green peppers in green vegetables all contain different vitamins and trace elements, which are all essential nutrients for human body. Therefore, it is beneficial to health and longevity to mix foods of various colors in the diet, avoid partial eclipse or picky eaters, and balance the necessary acidic and alkaline foods in the body.