The first stage of healthy food: tea, papaya juice, tomatoes, oranges, oranges and carrots. Drinking tea can enhance your resistance to bacteria and keep you away from doctors. A new study believes that theanine contained in tea can enhance the body's resistance, and its effect is not available in coffee. A study published in the new issue of Proceedings of the National Academy of Sciences said that researchers from brigham Women's Hospital and Harvard Medical School found in laboratory experiments that tea contains a substance that can make the immune system attack invading bacteria, viruses and molds. Luc Montagnier, president of the World AIDS Research and Prevention Foundation, said that the juice extracted from fermented papaya can enhance human immunity and fight against some viruses, including SARS, but there is still a lack of research in this field. Montagnier said: "Papaya juice contains some substances that can improve immunity and antioxidant capacity. Although we have not studied the oxidation ability of SARS patients, I think it is feasible. " Montagnier said that he had recommended this extract to his colleagues to treat French SARS patients. Eating oranges and tomatoes can prevent diseases and improve immunity, which is one of the effective ways to prevent SARS. In recent days, the sales of vitamins and American ginseng in some pharmacies have increased greatly. However, medical experts warn that taking these supplements will not be immediate, and it will take at least a week to take effect. According to experts, proper vitamin supplementation can enhance human immunity. Healthy people had better absorb vitamins by eating fruits and vegetables. At present, tomatoes, strawberries, carrots and oranges, which are widely sold in the market, contain a lot of vitamins. Eating carrots in spring to enhance immunity shows that vitamin A deficiency in children is a major cause of respiratory diseases. Experts emphasize that lack of vitamin A can easily cause respiratory and digestive tract infections. Once a cold or diarrhea occurs, the level of vitamin A in the body will further drop. Vitamin A deficiency can also reduce the body's antibody response, leading to decreased immune function. The protective effect of vitamin A on respiratory tract and gastrointestinal mucosa has been widely confirmed. Supplementing vitamin A from food is a safe and effective health care method. Among many foods, carrot is the best way to supplement vitamin A. To fully absorb carotene, the scientific and reasonable way to eat it is: carrots should be cooked before eating, and the best cooking methods to maintain their nutrition are two points: First, cut carrots into pieces, add seasonings, and stir-fry with enough oil; The second is to cut carrots into blocks, add seasonings, and stew them with pork, beef and mutton in a pressure cooker 15-20 minutes. Carotene is easy to be oxidized. Cooking in pressure cooker can reduce the contact between carrots and air, and the preservation rate of carotene can reach 97%. The second stage: animal liver, seafood, mushrooms, Pleurotus ostreatus, garlic, yogurt and spinach are of great significance to improve human immunity in the process of fighting viruses, bacteria and other pathogens. Generally speaking, the stronger the immune function of the human body, the less likely it is to be attacked by viruses. Even if you are unfortunately infected, you can minimize the degree of virus attack. A balanced diet and reasonable nutrition are helpful to improve human immunity. Here are some dietotherapy methods that can enhance immunity: eating animal liver properly. Canadian nutritionist Ann Mackenzie believes that animal liver is rich in many substances that help to promote immune function, such as trace elements selenium, zinc, copper, magnesium, iron and folic acid, vitamin B6 and vitamin B 12. Eating more seafood, oysters, scallops, razor clams, marine fish and other foods is rich in zinc, which can promote the production of T cells and antibodies. Dr spector's research in the United States found that zinc helps to restore the damaged immune system function. Eating anti-virus substances such as mushrooms, shiitake mushrooms, Grifola frondosa, Pleurotus ostreatus and Hericium erinaceus can help to enhance immunity. Eating garlic can stimulate the activity of T lymphocytes and macrophages and enhance immunity. Have some yogurt. The latest research found that yogurt can stimulate human body to produce γ-interferon, improve the activity of natural killer cells and promote the production of antibodies. Eat more fruits and vegetables, such as spinach, carrots and cauliflower. , rich in beta carotene, can promote the increase of immune cells, and rich in vitamin C, fruit with certain antiviral effect. For example, eat two oranges or oranges every day. Drink more tea According to the research of Dr. Jack bukovski of Harvard Medical School, drinking five cups of tea a day can enhance the body's disease resistance. The reason is that L- theanine contained in tea is decomposed into ethylamine by the liver, which can enhance the γ-δT cell response in the immune system. The third stage: hawthorn, seabuckthorn, spiral bath, aloe, ginger, propolis, milk and soybean. When it comes to disease prevention, many experts remind people to enhance their immunity. The immune system plays an important role in people's health. Play strengthens the body. Besides regular exercise and maintaining psychological balance, a reasonable diet is also important. Here are several foods that can significantly enhance the body's immune function. Hawthorn: Hawthorn is deeply loved by people. Its main functions are to help digestion, protect cardiovascular system, reduce blood fat, lower blood pressure, resist bacteria, lose weight, resist tumor, remove free radicals and enhance immunity. Garlic: Garlic has antibacterial and anti-inflammatory effects, which can protect the liver, regulate blood sugar, protect the cardiovascular system, resist hyperlipidemia and arteriosclerosis, and resist platelet aggregation. Nutrition experts have found that garlic extract has anti-tumor effect, so it is recommended to eat 3-5 grams of garlic raw every day. Seabuckthorn: Seabuckthorn grows in the semi-hilly area and is rich in vitamin C, which can promote hematopoietic system, resist fatigue, protect digestive tract, remove free radicals, improve vascular system and enhance immunity. Spirulina: The protein content of Spirulina is as high as %-70%, and its biological value is 68%. Spirulina is rich in carrots, vitamins, vitamin E and other vitamins, which can improve the PH value of body fluids, correct acidic constitution, make human body slightly alkaline, thus improving human immunity, and has anti-tumor and anti-AIDS effects. Aloe vera: Aloe vera, like Jinxiang, garlic, onion and wild lily, belongs to perennial herbs of Liliaceae. It mainly grows in dry and hot areas and has strong vitality. Has effects in clearing away heat and toxic materials, relieving diarrhea, diminishing inflammation and bacteria, enhancing immunity, protecting stomach and liver, and caring skin. Ginger: It is not only a condiment, but also a nutrient. Its main functions are anticoagulation, reducing blood lipid and preventing stroke. Raw slices are the best. Mushrooms: Since ancient times, mushrooms have been called "elixir of life". It has an excellent filtering effect on viruses, and the "Mushroom Hot Pot Banquet" in Yunnan is a medicated diet for strengthening the body. Propolis: Propolis can improve the ability of human macrophages to swallow viruses and bacteria, and make the body's immunity in the best dynamic balance. It is called "natural immune enhancer". Milk and soybeans: Milk and soybeans are high-protein foods. Anders-Heckensson research team of Lund University in Sweden found that casein and ovalbumin in milk can enhance the anti-infection ability of respiratory tract and internal organs and prevent viruses and bacteria from adhering to respiratory tract. Soybean protein in soybean is digested, absorbed and utilized by human body to a very high degree. It can form antibodies in the body like milk protein.