unit 2补充阅读.docVIP

Iron?and?iron?deficiency?facts What is iron and why do we need it?? Iron is a mineral needed by our bodies. Iron is a part of all cells and does many things in our bodies. For example, iron (as part of the protein hemoglobin) carries oxygen from our lungs throughout our bodies. Having too little hemoglobin is called anemia. Iron also helps our muscles store and use oxygen.? Iron is a part of many enzymes (生化酶) and is used in many cell functions. Enzymes help our bodies digest foods and also help with many other important reactions that occur within our bodies. When our bodies dont have enough iron, many parts of our bodies are affected.? Iron and iron deficiency facts? Iron deficiency is the most common nutritional deficiency and the leading cause of anemia(贫血) in the United States. Iron deficiency is due either to increased need for iron by the body or a decreased absorption or amount of iron taken in. Signs of iron deficiency include fatigue, decreased work and school performance, slow cognitive and social development during childhood, difficulty maintaining body temperature, decreased immune function, and glossitis (an inflamed tongue). Blood tests establish the diagnosis(诊断) of iron deficiency. Dietary changes or iron supplements are possible treatments for iron deficiency.? What is iron deficiency and why is it a concern?? Iron deficiency is a condition resulting from too little iron in the body. Iron deficiency is the most common nutritional deficiency and the leading cause of anemia in the United States. The terms anemia, iron deficiency, and iron deficiency anemia often are used interchangeably but equivalent. Iron deficiency ranges from depleted iron stores without functional or health impairment to iron deficiency with anemia, which affects the functioning of several organ systems.2? Iron deficiency is a concern because it can:? Iron deficiency can delay normal infant motor function (normal activity and movement) or mental function (normal thinking and pro