The MOST common micronutrient deficiency in the world is

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Iron deficiency is the most common micronutrient deficiency in the world, affecting an estimated 2 billion people. It is especially prevalent among children and women of reproductive age. Iron is necessary for the production of hemoglobin, which carries oxygen in the blood, and a lack of iron can lead to anemia and other health problems. Sodium deficiency is rare, as most people consume more sodium than they need. Selenium deficiency is also uncommon, and calcium deficiency is not as widespread as iron deficiency.

The MOST Common Micronutrient Deficiency in the World Is