The immune system is responsible for defending the body from bacteria, viruses and other infectious agents, and can be considered the body’s security officer. Without relying on drugs or healthy food, the following 10 tips will be able to defend your child’s immune system and make it work best. 1, drink more water Drink more water to keep the mucous membranes moist and become an important line of defense against bacteria. 80 pounds (about 36 kg) of children under 80 pounds (about 36 kg), the amount of water to drink a day is 250 cc for every 10 pounds of body weight (that is, the weight of 18 kg of children should drink 1000 cc of water a day). To ensure health, children should understand the importance of drinking water as much as possible. Let your child carry a water bottle when you go to school, when you go out, keep a bottle of water in the car at all times, make it a rule that everyone has to drink water at dinner, so that drinking water becomes a good habit, and you will find another benefit of water: even if you accidentally spill it, you will not stain your clothes. 2, do not have to be too clean The immune system can form an immune memory to infectious agents, in case they meet again, can quickly eliminate them, if your home is too clean, children do not have the opportunity to produce antibodies through the infection, resistance is weakened, and may lead to allergies and autoimmune disorders. The World Health Organization (WHO) has warned that antibacterial cleaning products will make the problem of microbial resistance more serious; and the American Medical Association also urged the public to avoid using cleaning products containing antibacterial ingredients, because these products may be the source of drug-resistant microorganisms, as long as the use of ordinary soap and water to clean the effect. Teach children to wash their hands Although too antibacterial, clean is not beneficial to health, but still to develop children’s basic hygiene habits, especially in the toilet after washing hands clean, can prevent diarrhea or urinary tract infections and other diseases. 3, enough sleep poor sleep will make the body responsible for dealing with viruses and tumors in the number of T cells decreased, and the chance of illness increased. Experts recommend that growing children need 8 to 10 hours of sleep a day. If your child doesn’t get enough sleep at night, let him take a nap during the day. 4, and children to discuss the body’s ability to heal itself Let children understand the body has the power of self-healing, when the child has a cold or bruises, together with the speed of his recovery, so that children will learn to trust their own body instincts, not too dependent on drugs. A study presented at the 2000 American College of Rheumatology pointed out that parents of chronically ill children who frequently discuss illness with their children, emphasizing their frailty, will make them more anxious and restless. 5, more contact with other children According to a 2000 study published in the New England Journal of Medicine, children under the age of 13 who spend time with older hands and feet or children in child care facilities when they are young are half as likely to develop asthma later in life. Dr. White, the study’s presenter, pointed out that exposure to infectious agents through contact with other children can stimulate a child’s immune response, strengthening his immune system and reducing the chances of reacting to allergens that cause asthma. 6, reduce sugar Some experts believe that consuming a diet too high in sugar will interfere with the immune function of white blood cells. 7, supplement essential fatty acids EFAs (essential fatty acids) EFAs can provide important components of cell membranes, determine the flow and elasticity of cell membranes, and are very important for immune cells. The human body can not synthesize EFAs, only from natural foods including seafood, fruits and vegetables, such as salmon, herring, sardines and other deep-sea fish; walnuts, almonds and other nuts; flaxseed oil, sunflower oil, safflower oil also contains EFAs, but note that some oils such as flaxseed oil need to avoid high-temperature frying, it is best to add directly to the cooked food. 8, reduce stress There are studies that point out that the more stress you are under, the more likely you are to catch a cold. Teach your child the skills of relaxation and arrange appropriate activities, so as not to let the stress crush the immunity of children. 9, eat more fruits and vegetables Modern children are prone to partial diet, unbalanced nutrition will cause the lungs and digestive tract mucous membrane thinning, antibody reduction, affecting the body’s defense function. Citrus fruits are rich in vitamin C, which can increase the number of phagocytes; strengthen the vitality of natural killer cells; build and maintain mucous membranes, collagen tissue to help wounds heal. Carrots and other dark orange fruits and vegetables such as mangoes and sweet potatoes are rich in beta carotene, which can be converted into vitamin A. Vitamin A can maintain the integrity of epithelial cells and mucosal tissues and reduce infections; improve antibody responses and promote white blood cell production; and participate in the replenishment of free radicals that damage cells. Other fruits and vegetables that can nourish the immune system include tomatoes, cruciferous vegetables, garlic, shiitake mushrooms, etc. 10.Reduce pollution According to a survey by the Canadian Health Organization, 68% of diseases are related to indoor pollution, and 80-90% of cancers are caused by living environment and habits. These pollutants include atmospheric pollutants entering the room, such as sand, dust, heavy metals, ozone, nitrogen oxides, etc.; human metabolism and a variety of life waste volatile components, such as dust, dander, lint, fiber, heavy metals, body odor, a variety of parasites, mites, germs, viruses, fungi, mold, etc.; pollution from pets, such as odor, parasites, bacteria, hair, crumbs; cigarette smoke; Building materials and decoration materials, such as formaldehyde, ammonia, benzene, ozone and radioactive substances such as radon; daily necessities such as cosmetics, insecticides, fragrance sprays, cleaning agents, etc. Ways to prevent pollution: 1. To open windows and doors regularly for ventilation. At least 2 times a day, choose the time period with low air pollution such as 9-11 a.m. and 3-5 p.m., no less than 45 minutes each time, to ensure the air circulation in children’s rooms. 2, is more to take children to the fresh air of parks, green spaces and other places to do outdoor sports to enhance children’s physical fitness and improve their immunity. 3, is the home decoration, especially the decoration of children’s rooms, to choose green and environmentally friendly materials, and within six months of the decoration to avoid children moving in. 4, is the indoor disinfection once a week, such as the use of vinegar fumigation method, in order to reduce the number of pathogenic microorganisms. 5, is to encourage children to eat more vegetables, fruits, seaweed, pig’s blood and other foods with anti-pollution function. 6, is to adhere to physical exercise, enhance the child’s organism anti-pollution ability. 7, is the parents do not smoke in front of the child, or in the child’s living room. Special attention: health care products, to improve immunity or not useful? Nowadays, there are many health care drugs or foods on the market that claim to improve the immunity of children. This should be said to be a good phenomenon, because it shows that the whole society is generally concerned about children’s problems. However, many of these products may also be misleading to parents. Many of these supplements are overstated in their descriptions of how they can improve immunity, lacking rigorous scientific validation, and their effectiveness is very limited. In addition, as we mentioned earlier, there are different types of immune deficiency, and the links that affect each individual vary from one type to another. Without knowing the type of immune deficiency, the blind use of immunity-boosting drugs or supplements may not be effective and may cause adverse consequences, such as disrupting the immune balance and causing other abnormal changes in the body. In fact, the vast majority of children with physiological immune deficiency do not require special treatment. By strengthening and balancing the child’s nutrition and improving physical exercise, the child’s immune status will be significantly improved and he or she will be able to adapt to the environment quickly. For some children with severe immune deficiency, the first task for parents is to clarify the type of immune deficiency in their child with an immunologist. If there is no congenital or acquired secondary immune deficiency, some medication can be used, but only under the guidance of a doctor. Special Note: In conclusion, immune deficiency is common in children compared to adults, and it is important to distinguish the type of immune deficiency. It is not correct to blindly use immune-boosting drugs or supplements.