Vitamin B12 Deficiency Essay

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Vitamin B12 Deficiency What is Vitamin B12? Vitamin B12 is an essential nutrient that plays an important role in DNA synthesis and nerve function. It is contained in high amounts in animal derived foods such as milk, eggs, and meat. The vitamin is stored in the liver long-term. Individuals with vegetarian, vegan, or other forms of restricted diet may develop the condition after approximately 6 months as liver stores of vitamin B12 become depleted. Some individuals develop the condition due to autoimmune destruction of cells in the stomach that produce intrinsic factor. Intrinsic factor is necessary for proper absorption of vitamin B12 in the small intestine. Individuals with vitamin B12 deficiency often develop hematologic abnormalities …show more content…

This disease is characterized by autoantibodies against intrinsic factor producing cells in the stomach (atrophic gastritis). Intrinsic factor is an important molecule that binds to vitamin B12 in the stomach, allowing the vitamin B12/intrinsic factor complex to become absorbed in the small intestine. Other disorders associated with B12 deficiency include celiac disease and inflammatory bowel disease – this occurs as a result of malabsorption. Individuals that have undergone bowel resection of the stomach or small intestine (e.g., ileum) are also at increased risk. How common is vitamin B12 deficiency? Vitamin B12 deficiency is common in the United States and often responsible for anemia and neurologic symptoms, particularly in the elderly. A study in the United Kingdom showed that the age-specific prevalence of vitamin B12 deficiency is about 5% in adults age 65-74 and 10% in adults age ≥75. Another research group reported a 24% prevalence in adults age 75-80. Studies in France show that 60%-70% of cases of vitamin B12 deficiency were related to gastric atrophy, while pernicious anemia was responsible for 15%-20% of cases. What are the symptoms and signs of vitamin B12 deficiency? The clinical features of vitamin B12 deficiency often include: • Subacute combined degeneration of the spinal cord •

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