Which nutrient deficiency is most commonly associated with anemia?

• A. Vitamin B12 deficiency
• B. Folate deficiency
• C. Iron deficiency
• D. Vitamin C deficiency

Answer: (C)

Anemia most often comes from not having enough iron to make hemoglobin, the protein that carries oxygen in red blood cells. Iron is essential for hemoglobin production, so when iron is deficient, red blood cells become smaller and paler and there aren’t enough hemoglobin molecules to meet the body’s needs. This is the most common nutritional cause of anemia worldwide.

Other deficiencies can cause anemia too, but in different ways. Vitamin B12 and folate deficiencies lead to megaloblastic anemia, where red blood cells are unusually large and don’t develop properly. Vitamin C deficiency isn’t a direct cause of anemia, though it can affect iron absorption. Overall, iron deficiency best explains the widespread link between a nutrient shortage and anemia.