Iron deficiency is the most common of nutrient deficiencies, affecting as many as two-thirds of all children and women of child-bearing age worldwide. Iron deficiency severe enough to cause anemia affects 20-25% of infants and as many as 40% of women and 25% of men. Iron deficiency occurs in industrially developed as well as developing populations. In the United States, 9-11% of toddlers, adolescent girls, and women of child-bearing age have iron deficiency, and 2-4% have iron deficiency anemia. The prevalence of iron deficiency is approximately doubled in US black and Hispanic women.
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