Fatigue can be a symptom of which nutrient deficiency?

Fatigue can be a symptom of deficiencies in several key nutrients, including Vitamin B12, iodine, and vitamin D.

Vitamin B12 is essential for the production of red blood cells, which carry oxygen throughout the body. A deficiency can lead to anemia, resulting in fatigue due to reduced oxygen availability to tissues.

Iodine is critical for the production of thyroid hormones, which regulate metabolism. A deficiency can lead to hypothyroidism, characterized by fatigue, low energy levels, and other systemic issues.

Vitamin D plays an essential role in many bodily functions, including muscle function and immune response. A deficiency in vitamin D can lead to fatigue and weakness, as the body may not be able to function optimally without adequate levels of this vitamin.

Thus, because all three nutrients can contribute to fatigue when deficient, the correct answer encompasses all of the listed options.