Giving blood could be dangerous for teenage girls

A new study by Johns Hopkins shows that teenage girls who donate blood may be at risk for iron deficiency.

Scientists examined blood samples from nearly 10,000 girls who donated blood in the last year. Their iron levels were lower than those of non-donors, regardless of age, but were particularly low among adolescents.

Since anemia can impair brain development, experts say that increased protection of adolescent donors may be necessary.

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