Suggestion: Disease analysis: the main cause of anemia. Insufficient hematopoietic materials: iron deficiency (iron deficiency anemia) and folic acid deficiency (megaloblastic anemia); Morphological changes of blood cells (such as sickle anemia); Decreased hematopoietic function of human body (that is, decreased hematopoietic function of bone marrow); Excessive destruction or loss of red blood cells. Guidance: Dietotherapy is possible. Iron-rich foods include animal liver, kidney, tongue, duck gizzard, squid, jellyfish, shrimp skin, egg yolk and other animal foods, as well as sesame, kelp, black fungus, laver, Nostoc flagelliforme, mushrooms, soybeans, black beans, yuba, red fermented bean curd, celery, shepherd's purse, jujube and so on.