Iron deficiency anemia is the most common type of anemia. Iron is a mineral necessary for the production of hemoglobin, and if you do not get enough iron, there will be fewer red blood cells. Iron deficiency is caused by chronic blood loss, lack of iron in the diet, reduced ability of the intestines to absorb iron, or increased body needs for iron due to pregnancy. Iron deficiency anemia is not uncommon and is by far the most prevalent and nutritionally related disease in the world. Iron deficiency anemia occurs slowly and can be asymptomatic or mild in the early stages. In severe or rapidly progressing anemia, symptoms such as weakness, palpitations, shortness of breath, dizziness, and pallor are common. Some specific neurological symptoms such as easy excitement, agitation, irritability, headache, etc. are common in children. Some children develop omnivorous fetishes such as mud, stone chips, coal chips, raw rice, etc. The symptoms will disappear after iron deficiency is corrected. Those with more severe anemia may develop tongue inflammation, keratitis, tongue papillae atrophy, chronic gastritis, gastric acid deficiency, etc. They may also have dry and wrinkled skin, dry and lusterless hair, easy hair loss, thinning, brittle and lack of luster nails, rebound nail and swallowing difficulties in severe cases. Iron supplementation is the most basic treatment for iron deficiency anemia, and oral iron supplements should be taken for obvious symptoms. However, too much iron supplementation and over-saturation of the liver and other organs with iron can also lead to disease. Therefore, the best way to supplement iron is through diet, using food therapy. Those rich in iron include animal liver and kidney; followed by lean meat, egg yolk, chicken, fish, shrimp and beans. Green leafy vegetables containing more iron are alfalfa, spinach, celery, rape, amaranth, capers, yellow cauliflower, tomatoes and so on. Fruits such as apricots, peaches, plums, raisins, dates, cherries, etc. contain more iron, dried fruits such as walnuts, others such as kelp, brown sugar, sesame paste also contains iron.