What is iron deficiency anemia?What are the main signs and symptoms of iron deficiency anemia?How is iron deficiency anemia diagnosed?What are some of the main medical treatments for iron deficiency anemia?Have any supplements been studied for iron deficiency anemia?How could diet affect iron deficiency anemia?Are there any other treatments for iron deficiency anemia?What causes iron deficiency anemia?Can exercise contribute to iron deficiency anemia?How long should iron be taken?When should iron be given intravenously?What is the difference between heme and nonheme iron?What dietary factors affect iron absorption?