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Pernicious anemia is the most common cause of clinically evident vitamin B 12 deficiency worldwide. [14] Pernicious anemia due to autoimmune problems occurs in about one per 1000 people in the US. Among those over the age of 60, about 2% have the condition. [8] It more commonly affects people of northern European descent. [2]
Pernicious anemia is the most common cause of vitamin B 12 deficiency anemia in adults, which results from malabsorption of vitamin B 12 due to a lack or loss of intrinsic factor. [ 2 ] [ 8 ] There are relatively few studies which have assessed the impact of haematological measures in response to B 12 supplementation.
Pernicious anemia caused by loss of intrinsic factor cannot be prevented. [105] If there are other, reversible causes of low vitamin B 12 levels, the cause must be treated. [106] Vitamin B 12 deficiency anemia is usually easily treated by providing the necessary level of vitamin B 12 supplementation. [107]
Pancreatic exocrine insufficiency can interfere with normal dissociation of vitamin B 12 from its binding proteins in the small intestine, preventing its absorption via the intrinsic factor complex. [17] Other risk factors contributing to pernicious anemia are anything that damages or removes a portion of the stomach's parietal cells, including ...
As a result, the stomach's secretion of essential substances such as hydrochloric acid, pepsin, and intrinsic factor is impaired, leading to digestive problems. The most common are pernicious anemia possibly leading to vitamin B 12 deficiency; and malabsorption of iron, leading to iron deficiency anaemia. [2]
This identified "LLD factor" as essential for the bacteria's growth. [147] Shorb, Folker and Alexander R. Todd, at the University of Cambridge, used the LLD assay to extract the anti-pernicious anemia factor from liver extracts, purify it, and name it vitamin B 12. [148] In 1955, Todd helped elucidate the structure of the vitamin.
“There's great research to suggest that reducing drinking, even if you're not stopping completely, is associated with health benefits, particularly for those with high levels of drinking risk ...
Symptoms of severe or rapid-onset anemia are very dangerous as the body is unable to adjust to the lack of hemoglobin. This may result in shock and death. Mild and moderate anemia have symptoms that develop slowly over time.[5] If patients believe that they are at risk for or experience symptoms of anemia, they should contact their doctor. [8]
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