Do you have Pale Skin?
If you do, you may be deficient in IRON, FOLIC ACID, OR VITAMIN B12
Anaemia is a condition in which the blood cannot carry enough oxygen, either because there is a low number of red blood cells or because each red blood cell is less able to carry oxygen than normal. Symptoms of anaemia include feeling tired or faint and getting breathless easily.
Everyone automatically thinks of iron and anaemia, but this is not so. There are many different types of anaemia with different causes. Vitamin B12 deficiency is a possible cause.
Vitamin B12 is needed to make red blood cells, and it is also essential for the nerves and brain.
Other nutrients that are needed to make red blood cells include iron and folate (folic acid). A lack of these in the diet can also cause anaemia.
Causes of iron-deficiency anaemia
Causes of vitamin B12 deficiency
In most cases, vitamin B12 deficiency happens because the stomach cannot produce enough of a substance called intrinsic factor (IF), which is needed for vitamin B12 to be absorbed. This is called pernicious anaemia.
Pernicious anaemia is an autoimmune condition. Normally cells called antibodies, produced by the body’s immune system, attack foreign substances such as viruses and bacteria. With autoimmune conditions, the immune system mistakes the person’s own tissue as foreign and attacks it. Mostly, this is due to smoking.
With pernicious anaemia, antibodies damage the cells in the stomach that produce intrinsic factor.
Pernicious anaemia usually develops in people over the age of 50, and tends to run in families. If left untreated, pernicious anaemia can become life-threatening.
Other causes of B12 deficiency
People with vitamin B12-deficiency anaemia have symptoms caused by a low level of oxygen in the body. These include:
As well as the symptoms of anaemia, vitamin B12 deficiency may cause neurological symptoms such as inflammation of the nerves (neuritis) which can affect movement and sensation, tinnitus (ringing in the ears), colour blindness, lightheadedness, confusion, depression, poor concentration and forgetfulness. There may also be loss of appetite, diarrhoea and weight loss.
Anyone with symptoms that suggest anaemia, such as pale skin, weakness and fatigue, should visit their GP. He or she will ask about your symptoms, medical history and current eating habits, and perform a physical examination.
A simple blood test can count the number of red blood cells and measure the amount of haemoglobin.
The size of the red blood cells will also be examined. Enlarged red cells, called megaloblasts, are caused by vitamin B12 deficiency and folate deficiency. If they are present the condition is called megaloblastic anaemia. Finding megaloblasts in the blood can help to diagnose anaemia but does not determine the cause.
The level of vitamin B12 can be measured with a blood test, if necessary.
The GP may recommend further tests to identify the cause of B12 deficiency. One test looks at how well vitamin B12 is absorbed by the body. This involves fasting overnight and then having a vitamin B12 injection and taking radioactive-labelled vitamin B12 tablets. The amount of vitamin B12 that comes out in the urine is measured. This is called the Schilling test.
The antibodies which cause pernicious anaemia can also be tested for. A blood test can also identify coeliac disease or blood conditions such as thalassaemia.
Treating vitamin B12 deficiency
Treatment for vitamin B12 deficiency anaemia is usually injections of vitamin B12. The frequency of injection depends on the exact type and severity of the anaemia, but is usually every one to three months, after an initial two weeks of more frequent injections. Vitamin B12 injections sometimes cause bruising and soreness.
In severe cases of B12-deficiency anaemia, a blood transfusion may be required.
If the deficiency is caused by low dietary intake, vitamin B12 tablets may be taken.
The best way to prevent B12-deficiency anaemia is to eat a diet containing plenty of vitamin B12. The daily recommended intake for an adult is 1.5µg (1.5 micrograms) a day.
Vitamin B12 is found in meat and animal products, particularly liver, salmon, cod, cheese and eggs. The following is a list of the amount of folate contained in 100g of these foods:
Strict vegetarians should consider taking a regular vitamin B12 supplement to prevent anaemia. Anyone who is worried about vitamin B12 intake should speak to a GP or dietician.
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