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In general, a lack of iron-rich foods in the diet leads to iron deficiency. That, and menstruation in adolescent girls, are the most common causes. Vegetarians are also at a greater risk for iron deficiency.
From Good Kids, Bad Habits: The RealAge Guide to Raising Healthy Children by Jennifer Trachtenberg.

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Good Kids, Bad Habits: The RealAge Guide to Raising Healthy Children
When kids start going on TV binges or devouring fistfuls of cookies, it's easy to say, "They'll grow out of it." More likely, they're acquiring bad habits that could lead to childhood obesity and...
Iron deficiency is caused by a lack of iron intake. If a child is not eating foods that are either iron-fortified or are a natural iron source, then he or she is at risk for an iron deficiency. A common scenario is when a child is exclusively breastfed. Breast milk has iron but very little can be converted to a useable form. If after four to six months the infant is not fed iron-fortified food, or changed to drinking cow's milk formula, there may be a risk of developing iron deficiency anemia.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.