Vitamin B12 Deficiency: Causes, Symptoms and Treatment
Vitamin B12 deficiency occurs when the body does not receive or absorb enough of this essential vitamin. It can lead to anemia, nerve damage, and a range of other serious health problems.
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Vitamin B12 deficiency occurs when the body does not receive or absorb enough of this essential vitamin. It can lead to anemia, nerve damage, and a range of other serious health problems.
What Is Vitamin B12 Deficiency?
Vitamin B12, also known as cobalamin, is a water-soluble vitamin that plays a crucial role in the production of red blood cells, the maintenance of the nervous system, and DNA synthesis. A Vitamin B12 deficiency develops when the intake or absorption of this vitamin is insufficient over an extended period of time. Because the liver can store Vitamin B12, it may take several years before a deficiency causes noticeable symptoms.
Causes
Vitamin B12 deficiency can result from several different causes:
- Insufficient dietary intake: Vitamin B12 is found almost exclusively in animal-based foods. People following vegan or strict vegetarian diets are at increased risk.
- Malabsorption: Conditions such as pernicious anemia (an autoimmune condition causing lack of intrinsic factor), Crohn's disease, celiac disease, or gastric surgery can impair the absorption of Vitamin B12 in the gut.
- Medications: Long-term use of metformin (for type 2 diabetes) or proton pump inhibitors (stomach acid reducers) can reduce Vitamin B12 absorption.
- Age: Older adults often produce less stomach acid, which impairs the release and absorption of Vitamin B12 from food.
- Alcohol misuse: Chronic alcohol consumption can deplete Vitamin B12 stores.
Symptoms
The symptoms of Vitamin B12 deficiency often develop gradually and can be varied:
- Persistent fatigue and weakness
- Pale skin and mucous membranes
- Megaloblastic anemia (a type of anemia characterized by abnormally large, immature red blood cells)
- Tingling, numbness, or burning sensation in the hands and feet (peripheral neuropathy)
- Memory problems, difficulty concentrating, and confusion
- Depression and mood changes
- Inflamed, sore tongue (glossitis)
- Balance and coordination problems in advanced deficiency
Risk Groups
Certain groups of people are at particularly high risk of developing Vitamin B12 deficiency:
- Vegans and strict vegetarians
- Older adults (over 60 years of age)
- Pregnant and breastfeeding women
- People with chronic inflammatory bowel diseases
- Patients who have had gastric bypass or stomach removal surgery
- Long-term users of metformin or proton pump inhibitors
Diagnosis
Vitamin B12 deficiency is primarily diagnosed through a blood test. The following values are typically assessed:
- Serum Vitamin B12 levels: Values below 200 pg/ml (148 pmol/l) are considered deficient.
- Complete blood count: May reveal megaloblastic anemia (elevated MCV, abnormal red blood cell morphology).
- Holotranscobalamin (active B12): A more sensitive early marker of functional Vitamin B12 status.
- Methylmalonic acid and homocysteine: Elevated levels of these metabolites indicate a functional deficiency, even when serum levels appear normal.
Treatment
Treatment depends on the underlying cause and severity of the deficiency:
- Dietary changes: For mild deficiency caused by low intake, increasing consumption of B12-rich foods (meat, fish, eggs, dairy products) or fortified foods may be sufficient.
- Oral supplementation: High-dose Vitamin B12 supplements (500 to 2000 µg per day) can be effective even in cases of impaired absorption, as some B12 is absorbed passively without intrinsic factor.
- Intramuscular injections: In cases of severe malabsorption (e.g., pernicious anemia), Vitamin B12 injections (hydroxocobalamin or cyanocobalamin) are used to bypass the digestive tract entirely.
- Treatment of the underlying condition: Where malabsorptive disease is the cause, treating the root condition is essential.
Recommended Intake
The World Health Organization (WHO) recommends a daily intake of 2.4 µg of Vitamin B12 for adults. Requirements are higher during pregnancy (2.6 µg/day) and breastfeeding (2.8 µg/day). Since Vitamin B12 occurs in significant amounts only in animal products, regular supplementation is strongly recommended for individuals following a vegan diet.
References
- Stabler SP. Vitamin B12 Deficiency. New England Journal of Medicine. 2013;368(2):149-160. doi:10.1056/NEJMcp1113996
- World Health Organization (WHO): Vitamin and Mineral Requirements in Human Nutrition, 2nd Edition. Geneva: WHO Press, 2004.
- Green R, et al. Vitamin B12 deficiency. Nature Reviews Disease Primers. 2017;3:17040. doi:10.1038/nrdp.2017.40
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Related search terms: Vitamin B12 Deficiency + Vitamin B12 Deficit + Cobalamin Deficiency + B12 Deficiency