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Vitamin B12 deficiency is a condition that arises when the body does not have enough vitamin B12, an essential nutrient for red blood cell formation, neurological function, and DNA synthesis. Without adequate B12, the body struggles to produce healthy red blood cells, leading to anemia and impaired oxygen transport. Symptoms often include fatigue, weakness, pale or jaundiced skin, tingling in hands and feet, difficulty walking, memory problems, and mood disturbances.

The deficiency can result from poor dietary intake, especially in strict vegetarians or vegans, since B12 is primarily found in animal products. It may also occur due to malabsorption issues, such as pernicious anemia, gastrointestinal surgery, or chronic conditions like celiac or Crohn’s disease. Older adults are particularly at risk because stomach acid production decreases with age, reducing B12 absorption.

Diagnosis involves blood tests measuring B12 levels and sometimes methylmalonic acid or homocysteine. Treatment typically includes oral supplements or injections, depending on severity and cause. Preventive measures focus on maintaining a balanced diet with B12-rich foods like meat, fish, eggs, and dairy, or fortified plant-based alternatives. Early detection and management are crucial to avoid irreversible neurological damage and maintain overall health.