Iron is the essential element required for the formation of blood cells in the human body. It plays a critical role in the production of hemoglobin, the protein in red blood cells responsible for transporting oxygen from the lungs to various tissues throughout the body. Iron deficiency can lead to anemia, a condition characterized by fatigue and weakness due to inadequate oxygen supply. Additionally, iron is vital for overall metabolism and energy production. A balanced diet including iron-rich foods, such as red meat, legumes, and leafy greens, is important for maintaining optimal health.