Demir doğada en bol bulunan elementlerden biridir ve kullanımı teknolojik ve endüstriyel gelişmede olağanüstü öneme sahiptir. Beslenme alanında genellikle, özellikle çocuklarda entelektüel gelişimi etkileyebilecek ve çok sayıda anemiden sorumlu olan, yorgunluk hissi veya fiziksel çaba gösterememe duygusuna bağlı eksikliklerle ilişkilidir. Bu eksikliğe çözüm olarak diyetin demir sülfat veya organik demir gibi ikamelerle desteklenmesine karar verilir.
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