Final answer:
Iron deficiency is one of the most common nutrient deficiencies worldwide.
Step-by-step explanation:
One of the most common nutrient deficiencies worldwide, according to the World Health Organization, is iron deficiency. Iron is an essential mineral that plays a crucial role in the transportation of oxygen in the body through red blood cells. It is commonly found in foods like meat, legumes, and leafy greens. Iron deficiency can lead to anemia, fatigue, and impaired cognitive function.
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