There are many factors that can cause low white blood cells, and the first thing you should do is go to the hospital to identify the cause, and the treatment varies by cause. If the decrease in white blood cells is due to chemotherapy, it is very difficult to increase the white blood cells with diet alone, and you can take some medications that will be much more effective. If it is caused by infection or low immunity, diet should be rich in protein foods, such as lean meat, eggs, milk, fish and shrimp, soybean products, etc., to improve their immunity and fitness; more intake of mushroom foods, such as shiitake, mushrooms, enoki mushrooms, etc., which can help to raise white blood cells due to the richness of polysaccharides; more foods rich in beta-carotene, carrots, mangoes, apricots, pumpkins, etc., which can be converted into vitamin A in the body. can be converted into vitamin A in the body to reduce infection, improve antibody response and promote white blood cell production; eating more fruits rich in vitamin C, such as kiwi, dates, citrus, strawberries, green peppers and broccoli, can strengthen the vitality of cells. In addition, it can be combined with some nutritional supplements, such as royal jelly, ginseng, astragalus, red dates, cinnamon and lingzhi, etc. Also, moderate exercise is necessary, which is also beneficial for strengthening body resistance