The mineral essential for carrying oxygen in the blood is iron. Iron is a key component of hemoglobin, the protein within red blood cells that allows for the transport of oxygen from the lungs to tissues throughout the body. Adequate iron levels are crucial for maintaining energy levels and ensuring optimal physical performance. Deficiency in iron can lead to anemia, which may result in fatigue, weakness, and decreased exercise tolerance. Thus, individuals, particularly athletes and women, should prioritize iron-rich foods such as red meat, poultry, fish, beans, and fortified cereals to support overall health.