Food can only provide nutrients and cannot help children prevent leukemia, and the cause of leukemia is not clear, so there is no effective preventive measure. The emergence of leukemia in children may be related to some triggering factors, such as viral infections, genetic factors, chemical elements, abnormal immune function, physical factors, etc. It may also be triggered by certain blood diseases, bad habits or cancer treatment. There is no evidence that food can prevent leukemia, but you can eat some high-protein foods as well as fresh fruits and vegetables, which can help the body to supplement more nutrients, thus improving the immune system. Children who have leukemia usually rarely have typical symptoms, especially in the early stage of leukemia, it is likely to be similar to the symptoms of the flu or other diseases, easy to be ignored, so parents should be vigilant.