What is the most common nutrient deficiency, both in the United States and worldwide?

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Iron deficiency is the most common nutrient deficiency worldwide, affecting approximately 25% of the global population. In the United States, iron deficiency is also a common nutrient deficiency and affects groups such as pregnant women and children. Calcium and vitamin D deficiencies can also be common, especially in the elderly population. Zinc deficiency is less common unless a person has specific conditions such as malabsorption syndromes or sickle cell anemia.

What Is the Most Common Nutrient Deficiency, Both in the United