1. A 66-year-old man presented with a two-week history of worsening fatigue and generalized weakness and was found to have severe microcytic anemia with hemoglobin 5.3 g/dL and mean corpuscular volume 57.8 um. He described a four-to-five-year history of persistent hypogeusia for all foods, which made it difficult for him to eat even when he felt hungry. Along with the iron deficiency which other mineral deficiency would you suspect. List out the functions of that mineral in the human body.
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