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This literature review evaluates the impact of dietary iron across different life stages to inform the Nordic Nutrition Recommendations. Findings indicate that iron deficiency (ID) and iron deficiency anemia (IDA) are linked to developmental delays in children and impaired cognitive function in adults. High heme iron intake is associated with an increased risk of type 2 diabetes. Recommendations include monitoring iron intake in infants, children, pregnant women, and individuals with high heme iron consumption.