Vitamin B12 deficiency as a worldwide problem

Area of Science:

• Nutritional Science
• Hematology

Background:

• Pernicious anemia is a significant global cause of megaloblastic anemia, particularly in individuals of European or African descent.
• Increasing rates of vegetarianism contribute to vitamin B12 deficiency, leading to hyperhomocysteinemia and potential health risks.
• Infants born to vitamin B12-deficient mothers face risks of developmental issues, growth failure, and anemia.

Purpose of the Study:

• To highlight the global prevalence and consequences of vitamin B12 deficiency.
• To identify key indicators for diagnosing vitamin B12 deficiency.
• To suggest areas for future research in vitamin B12 supplementation and bioavailability.

Main Methods:

• Review of global health data and nutritional studies related to vitamin B12 deficiency.
• Analysis of biochemical markers such as methylmalonic acid and total homocysteine.
• Identification of geographical regions and populations most affected by dietary vitamin B12 deficiency.

Main Results:

• Dietary vitamin B12 deficiency is a widespread issue, particularly in vegetarian populations and specific regions like the Indian subcontinent and parts of Africa and the Americas.
• Elevated methylmalonic acid and total homocysteine levels are sensitive indicators of vitamin B12 deficiency and correlate with clinical manifestations.
• Vegetarianism is a growing cause of vitamin B12 deficiency, impacting both adults and infants.

Conclusions:

• Vitamin B12 deficiency, especially due to dietary factors like vegetarianism, poses a significant global health challenge.
• Biochemical markers are vital for diagnosing vitamin B12 deficiency and assessing its clinical impact.
• Further research is needed on optimal vitamin B12 supplementation strategies and understanding B12 bioavailability in plant-based diets.