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Teens who donate blood are at significant risk for long-term iron deficiency, a new study warns. The concern comes as 16- to 18-year-olds have emerged as one of the fastest-growing groups of blood donors nationwide. But this study of nearly 31,000 teens who gave blood more than once between 2016 and 2018 found that roughly 1 in 10 were already iron-deficient when they donated for the first time.
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