Iron is considered an essential mineral because it is necessary for the proper functioning of the human body. The main reason why our body needs iron is because it enables transportation of oxygen throughout the body. It also plays an important role in the production of red blood cells and hemoglobin.
Most common nutrient deficiency is iron deficiency. Low level of iron in body can cause weakness, shortness of breath and dizziness. Iron deficiency is the most common cause of anemia.
Some of the best sources of iron are red meat, poultry, seafood, dark green leafy vegetables (especially spinach) and blueberries.