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What Does Iron Do? Your body needs iron to make hemoglobin, the part of your red blood cells that carries oxygen throughout your body. Every cell in your body needs iron to make energy. Not eating enough iron can lead to iron-deficiency anemia. People with a higher risk for iron-deficiency anemia include:
Healthy red blood cells are made in your bone marrow. Red blood cells circulate through your body for 3 to 4 months. Parts of your body, such as your spleen, remove old blood cells. Iron is a key part of red blood cells. Without iron, the blood cannot carry oxygen effectively. Your body normally gets iron through your diet. It also reuses iron from old red blood cells. Iron deficiency anemia develops when your body's iron stores run low. This can occur because: 1  You lose more blood cells and iron than your body can replace. 2  Your body does not do a good job of absorbing iron.  Your body is able to absorb iron, but you are not eating enough foods that contain iron.