Known risk factors for vitamin B12 deficiency include:
Age older than 75 years
Strict vegetarianism or a plant-based diet
Transcobalamin II deficiency
Organ meats, including liver and heart, are known to contain high amounts of vitamin B12.
Radioiodine ablation of the thyroid has not been found to cause vitamin B12 deficiency.
Learn more about risk factors for vitamin B12 deficiency.
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Cite this: Romesh Khardori. Fast Five Quiz: Vitamin B12 Deficiency Key Aspects - Medscape - Jan 17, 2023.