Iron deficiency is the most common nutritional deficiency in the world. Iron deficiency represents a spectrum ranging from iron depletion, which causes no physiological impairments, to iron-deficiency anemia, which affects the functioning of several organ systems (CDC, 1998). Iron deficiency and anemia are known to impair psychomotor development, affect physical activity and work capacity, lower resistance to infection, and, in pregnant women, increase the risk of preterm delivery and delivering a low birth-weight infant (IOM, 2001). Iron deficiency has also been linked to poorer cognition and behavioral and learning problems among school-age children and adolescents (Grantham-McGregor and Ani, 2001; Halterman


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