Leukocytes are a large group of cells in the blood, including neutrophils, eosinophils, basophils, monocytes, and lymphocytes. Their main function is to phagocytose and remove bacteria, viruses, senile and dead cells and mutated cells, and play the role of blood purification. The normal adult blood leukocyte count is (4.0-10.0) × 10^9/L. If the test result is lower than this standard, it indicates the presence of leukopenia. If leukopenia occurs, the cause should first be identified and treated according to the cause. Promoting leukocyte growth through dietary therapy is generally difficult. Even if food contains ingredients that promote leukocyte growth, the levels are low and hardly play a therapeutic role, so it is sufficient to maintain a normal diet and balanced nutrition on a daily basis. It should be noted that if the results of routine blood tests indicate low white blood cells, you need to go to the hematology department of the hospital in time to actively find the cause of the disease and give the appropriate treatment so as not to miss the best time for treatment and cause harm to your body.