Foods that leukemia patients should not eat should depend on the situation, such as prohibiting the use of raw, cold, stimulating, unclean food. Leukemia patients have lower immunity before disease treatment and after heavy use of chemotherapeutic drugs (cytarabine), and the gastric mucosa can be damaged due to repeated vomiting, so they should not consume unclean food (e.g., unwashed fruits, etc.), spicy and stimulating food (e.g., fried food, chili peppers, etc.), and hard food (e.g., large bones, etc.), so as not to cause infections and other undesirable complications. Leukemia patients should have a light diet with balanced nutrition. Specific diagnosis and treatment should be carried out under the guidance of physicians, and dietary precautions can be consulted with the attending physician.