(1) Adequate supply of protein and iron. Eat lean meat, animal liver, tofu, soybean milk, etc. These foods are not only rich in high-quality protein and iron, but also have no disadvantages of increasing phlegm and getting angry, which is conducive to strengthening patients' physique, improving disease resistance and promoting the repair of damaged tissues.

② Eat more foods containing vitamins A, C and calcium. Foods containing vitamin A, such as pork liver, egg yolk, cod liver oil, carrots, leeks, pumpkins, apricots, etc. It has the effect of moistening lung and protecting trachea. Foods containing vitamin C have anti-inflammatory, anti-cancer and anti-cold effects, such as jujube, grapefruit, tomato and green pepper. Calcium-containing foods can enhance the anti-allergic ability of trachea, such as pig bones, vegetables, tofu, sesame paste and so on. It should be noted that dairy products will thicken sputum and make it difficult to discharge, thus aggravating infection, so the intake of milk and its products should be restricted.

③ Increase liquid intake. Drinking more water is beneficial to dilute sputum and keep trachea unobstructed; Drink at least 2000 ml of water (including water in food) every day.

④ Regular consumption of edible fungi can regulate immune function. For example, mushrooms and mushrooms contain lentinan and mushroom polysaccharide, which can enhance the body's resistance and reduce the attack of bronchial asthma.