Vitamin B12 is needed to produce an adequate amount of healthy red blood cells in the bone marrow. Vitamin B12 is available only in animal foods (meat and dairy products) or yeast extracts (such as brewer's yeast). Vitamin B12 deficiency is defined by low levels of stored B12 in the body that can result in anemia, a lower-than-normal number of red blood cells.
Vitamin B12 deficiency can develop for the following reasons:
Absence of intrinsic factor, also called pernicious ...
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Source: ADAM Encyclopedia
Macrocytic anemiaSymptomsPeople with mild anemia may have no symptoms, or symptoms may be very mild.More typical symptoms of vitamin B12 deficiency... Read more »
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Source: Harvard Decision Guide
What Is It? Iron deficiency is an abnormally low level of iron in the body. Iron is an essential mineral found in red meat and certain fruits and... Read more »
Source: HealthCentral Encyclopedia
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