Food does not play a role in supplementing hemoglobin for the human body, food can only supplement nutrients for the organism, and some foods rich in high-quality protein and iron are beneficial for people with low hemoglobin. Hemoglobin is an iron-containing protein in human blood, which has the function of binding and transporting oxygen and plays a role in gas exchange. Low hemoglobin can be caused by iron deficiency anemia, megaloblastic anemia, and aplastic anemia. Food can only provide energy and nutrients for the normal functioning of the body. Foods rich in high quality protein, such as beef, can provide energy and protein for the body, while black fungus, mutton, and animal liver can provide iron for the body, which is beneficial for people with low hemoglobin when consumed in moderation. If you have low hemoglobin, it is recommended that you go to the hospital as soon as possible for a clear diagnosis and follow the doctor’s instructions for standardized treatment.