Worldwide, the most common nutrient deficiency is:

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Iron deficiency is the most common nutrient deficiency worldwide, affecting approximately 25% of the global population. It is particularly prevalent in developing countries where diets may be limited in iron-rich foods, and among women and children due to menstrual blood loss and growth demands, respectively. Iron deficiency is the most common nutrient deficiency worldwide, affecting around 25% of people globally, especially women and children in developing countries. Iron is essential for the production of hemoglobin, which carries oxygen in the blood. A lack of iron can lead to anemia, fatigue, and immune system impairment. While zinc, selenium, and iodine deficiencies are also significant global health concerns, they are not as prevalent as iron deficiency.

Worldwide, the Most Common Nutrient Deficiency Is