Winter outdoor activities are less, the human body for a long time in the indoor air conditioning environment, indoor and outdoor temperature difference, colds are easy to occur. Chronic nephritis patients tend to get worse after catching a cold, so it is especially important for such patients to adjust their immune system and prevent colds. Here are a few foods that help boost immunity. 1, pumpkin: rich in carotenoids, and can be used as a staple food. For example, pumpkin fried rice noodles, pumpkin soup, etc. 2, kiwi fruit: rich in vitamin C, can be eaten directly. Please consume immediately after cutting, avoid beating into juice, otherwise it will be easily oxidized. 3, germ rice: belongs to the whole grain food, rich in vitamin E, with antioxidant effect. Fiber content is also very high, can promote intestinal peristalsis, can shorten the time of harmful substances stay in the intestine, to help excretion. 4, mushroom food: the polysaccharides in them have a significant role in enhancing immune function, but also can improve cardiovascular function. For example, silver fungus contains 17 kinds of amino acids, calcium, vitamins, etc. It has the effect of nourishing Yin and moistening the lungs and nourishing the stomach. In addition, shiitake mushrooms, straw mushrooms, and reishi mushrooms, all of which can boost immunity. It should be noted that mushroom food is high in potassium and phosphorus, high blood potassium and high blood phosphorus patients are prohibited to eat. 5, cauliflower: rich in vitamin C and a variety of trace elements, and rich in dietary fiber. 6, quail eggs: suitable for malnourished people to eat. Quail eggs contain high quality protein, a variety of vitamins and phosphorus, calcium, iron, etc., has the effect of nourishing the blood, strengthening the body and brain. 7, red dates: for weak spleen and stomach, blood deficiency, fatigue, easy to catch a cold. The date contains sugar, calcium, phosphorus, iron, vitamin C, vitamin P, etc., is a “natural vitamin pill”, with the spleen and stomach, nourishing blood and calming effect. In recent years, it has been found that jujube contains a lot of adenosine cyclic phosphate, which has a vasodilating, anti-allergic effect. 8, yam: for the usual spleen and stomach weakness, immune system is particularly suitable for people. Yam contains calcium, phosphorus, polysaccharides, a variety of vitamins and saponins. Has a spleen, lung, kidney, nourishing and strong role. 9, tomatoes: contains a variety of antioxidant potent factors, such as the lycopene, carotene, vitamin E and C contained therein, can improve immunity. It is best to eat tomatoes slightly cooked with a little olive oil, can make the lycopene more absorbed by the body. 10, barley: contains protein, calcium, phosphorus, iron, vitamin B and so on. It has the function of strengthening the spleen, stopping diarrhea, promoting water permeation and improving immunity.