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Why does vitamin B12 deficiency cause anaemia?

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Why does vitamin B12 deficiency cause anaemia?

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Red blood cells are made in the bone marrow and circulate in the blood. They only have a life expectancy of about four months. The body needs iron, vitamin B12 and folic acid (one of the B group of vitamins) to produce more red blood cells. If there is a lack of one or more of these nutrients, anaemia will develop. Anaemia due to a lack of vitamin B12 is also called pernicious anaemia. Vitamin B12 is essential for the nervous system, which is why a deficiency can also cause inflammation of the nerves (neuritis) and dementia (mental deterioration). Elderly people are particularly at risk of vitamin B12 deficiency, although it may also be present in the young women.

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