Strengthening immunity to reduce the occurrence of disease can avoid many difficulties in seeing a doctor, suffering from illness and economic loss, and even death, and is of positive relevance to the current prevention of influenza A. Ninety percent of human diseases are related to immune disorders, and viruses and bacteria can only contribute to the onset of disease when immunity is low. The best doctor in the world is your own immune system. The human body can produce many different types of antibodies, and when a healthy person encounters a virus, the immune system produces the antibodies needed to fight it within 24 hours, without side effects. The immune system is divided into two categories: liquid immunity (immunoglobulins) and cellular immunity (B cells and T cells), with B cells producing various antibodies and T cells directly killing and engulfing various pathogens. A decrease in immunity means that the level and function of B and T cells have decreased, making people vulnerable to diseases. Immune organs include bone marrow, thymus, spleen, tonsils, lymph nodes, lymphatic vessels, and appendix. The causes of immune system decline include nutritional imbalance, overwork, lack of sleep, lack of exercise, bad mood, environmental pollution, viruses, food poisoning, chronic diseases, aging, obesity, and drugs. In how to enhance immunity, should pay special attention to the following aspects. 1, pay attention to diet control. Nutrition should be adequate, diet should be balanced. Unbalanced nutrition will lead to weakened immune function, incomplete nutrition will make immunity disorders. Protein is the main component of white blood cells and antibodies, the elderly diet protein is lower than the amount needed, phagocyte viability decreased by more than 25%. Eat a full breakfast, will make the anti-viral protein gamma interferon content increased by 45%, do not eat breakfast is down 17%. The bifidobacteria in yogurt can regulate the balance of intestinal flora, and lactobacilli can stimulate macrophages to engulf cancer cells. You should always eat foods rich in selenium, zinc and iron trace elements. Selenium deficiency is prone to infection with highly pathogenic viruses, AIDS patients lacking selenium, the mortality rate will be more than 20 times higher. If supplemented with 200 micrograms of selenium daily, T-lymphocytes and neutrophils can be increased in large numbers, which can reduce the incidence of cancer by 37%, mortality by 50%, prostate cancer by 63%, colon cancer by 58%, and lung cancer by 46%. The immunity of elderly people who take 100 micrograms of selenium enzyme preparation daily will be restored to the level of young people after six months. Goose eggs, duck eggs and eggs are high in selenium, and other foods rich in selenium include wheat, barley, corn, garlic, onion, broccoli and kale. Zinc deficiency in the human body will cause the thymus gland to atrophy, and lymphocytes to decrease in activity. He Shou Wu contains a lot of zinc, with 420 micrograms per 100 grams. Iron is the element for synthesizing hemoglobin, lack of iron affects immunity. Iron in animal liver, blood, fish, meat in the content of more, nori, sesame in a lot. Vitamins are also closely related to immunity. Vitamin C can stimulate the body to produce interferon and maintain the number of white blood cells, which are rapidly depleted when you have a cold. Clinical trials have shown that high doses of vitamin C can improve the function of lymphocytes and macrophages, and taking high doses of vitamin C at the beginning of a cold can significantly shorten the duration of the illness and reduce the severity of the cold. Vitamin B6 deficiency can cause degeneration of the immune system. Vitamin E can increase antibodies, remove viruses, bacteria and cancer cells, and prevent peroxidation of white blood cell membranes. beta carotene deficiency can seriously weaken the body’s resistance to viruses. Low levels of vitamin D increase the risk of disease. Vitamin D3 content plays a regulatory role in the body’s immunity, and only 0.009 mg of vitamin D3 is needed to increase immunity by a factor of 1. A daily dose of 15 minutes or more in the sun can meet the daily requirement of vitamin D. Polysaccharides are also immunomodulators and can stimulate the recovery of immune function. There are various types of polysaccharides such as Lycium barbarum, shiitake mushroom polysaccharide, black fungus polysaccharide and kelp polysaccharide. Drinking tea can increase immunity, tea in the L-theanine stimulation T-cells, will be 10 times the speed of division, and secrete anti-disease compounds to increase immunity. You should also eat bananas regularly, which not only increase white blood cells, but also produce “TNF” substances to attack abnormal cells. The riper the banana, the stronger the immune activity, the number of white blood cells produced after eating a banana with a black skin is five times higher than a banana without a black skin. Eating fruit one hour before meal can protect immunity from being attacked. Vinegar is also beneficial to enhance immunity. 2, exercise to enhance immunity. People with less activity suffer from cold and flu 2 to 3 times higher than those who exercise regularly. An acute exercise can make the total number of white blood cells rise briefly, promote the lysis activity of neutral white blood cells, and also make the function and killing power of TB cells increase. The increase in body temperature during exercise increases the phagocytic effect of macrophages on viruses and bacteria, prevents microorganisms from invading, inhibits them from reproducing, and reduces infectivity. The strength of immune function is mainly determined by the number of lymphocytes in T cells, which is 30% less in the blood of elderly people over 60 years old than in young people, but can be increased through exercise and work. The number of T cells in elderly people who often run long distances is not significantly different from that of young people. After jogging for 15 minutes, the white blood cells of the elderly can increase by 5%. The T-cell activity of female athletes was more than 1 times higher than that of female students, and the phagocytic activity of leukocytes increased by 15%. 60-year-olds who ran for 60 minutes a day increased the activity of natural cancer cells by more than 20%. The growth of T cells only lasts for 24 hours, so it is better to do a moderate amount of exercise every day. Walking at a fast pace for 45 minutes a day will reduce the disease by half. 3, ensure enough sleep, pay attention to the combination of work and rest. If sleep is reduced from 7 hours to 4 hours, the immunity will be down 50%. After a late night, immune cell activity will drop 28%, and will return to normal after additional sleep. During sleep, the body produces cytosolic acid sleep factor, which increases white blood cells and makes macrophages active. Therefore, there are many diseases that require bed rest to get better quickly. Experiments have shown that immunity is stronger at night than during the day. In addition, we should pay attention to the combination of work and rest, when overworked, the body hormones into the blood, excessive oxidation of blood, which will lead to the disappearance of immunoglobulins to reduce immunity, some diseases due to overworked and born. 4, maintain a good mood, pay attention to the balance of mind. Long-term stress, excessive mental tension, will accelerate the death of white blood cells. Modern human diseases, 70% from the nervous stress, can control the nervousness of people, the morbidity rate can be reduced by 77%. Tension, anxiety, fear, sadness, pessimism and other bad emotions will make the immunoglobulin A serotonin drop, causing adverse effects on the plant nerves, so that metabolism, endocrine disorders, immune decline, resulting in disease. The number of people suffering from colds is 3 to 5 times higher than normal people when they are in a bad mood. When a person is stimulated to appear frightened, fear, anger, anger and other mental abnormalities, norepinephrine in the body will suddenly increase and combine with the white blood cells in the blood, so that the white blood cells lose immunity. When the mood is bad to the extreme, there are many people who die of anger, anger, cursing, suicide and death. Under normal circumstances, macrophages will kill cancer cells, but when the mood is bad and immunity decreases, cancer cells will develop rapidly, and to a certain extent, the immune system can no longer help. In contrast, laughter suppresses depressive hormones, and people who laugh and have a good mood can have less cortisol (a hormone that suppresses immunity). Immunoglobulin A is significantly higher in optimistic people than in sentimental pessimists. People who participate in choirs have an average of 55.9% immune cells in their blood, which is 14% to 40% higher than the average healthy person. Chatting, entertainment, playing games, because the brain memory, thinking nerve stimulation, and the body T-cell immunoglobulin increased. Injecting 400 people with the flu virus, we found that 62% of people with 3 friends had the flu, and only 35% of people with 6 friends had the flu. The optimistic AIDS patients also live 9 months longer than the pessimistic AIDS patients. 5, pay attention to overcome the adverse factors to immunity. Avoid physical and chemical pollution such as sand, dust, paint, ammonia, benzene and radon. Toxic mold is easy to grow in a humid room, and Gram-positive bacteria multiply faster when the humidity is low. Influenza, cough, bronchitis, asthma, allergic dermatitis and other diseases are related to living in a low humidity environment for a long time. Normal humidity is 45% to 65% RH, humidity below 40% RH, cilia movement on the mucous membrane of the nose and lung respiratory tract slow down, dust, viruses, bacteria easily attached to the mucous membrane, stimulating cough, prone to respiratory diseases. When the humidity is at 50% RH, viruses and bacteria are not easily spread. When the temperature is 5 degrees, it is easy to spread influenza, and the lower the temperature, the higher the incidence. The immunity of the human body will be reduced by 30% when the body temperature drops by 1 degree, while the immunity will be enhanced by 5-6 times when the body temperature rises by 1 degree compared to the normal body temperature. Eating sweets will also reduce immunity. A white blood cell can swallow 14 germs, but only 10 after eating a sweet bun, 5 after eating a sugar snack, and 2 after eating a piece of chocolate. In obese people, the accumulation of fat also affects the vitality of immune cells. Pay attention to environmental pollution, children living in polluted areas, immunity is less than 1/3 of the children in normal areas. 6, immunity-enhancing drugs. Western medicine include nuclear cheese injection, levamisole, polymyxin, thymidine, gammaglobulin, interferon, transfer factor, placental lipopolysaccharide, etc. Immunological agents are mainly used for the treatment of immunodeficiency diseases and malignant tumors, and also for refractory bacterial, viral and fungal infections. Chinese medicines include Chinese wolfberry, ginseng, Chinese ginseng, yellow essence, lily of the valley, jujube, cordyceps, epimedium, and hypericum.