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: 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: ADAM Encyclopedia
FatigueHeadachePallorSore mouth and tongueSigns and testsBone marrow examination (rarely necessary)Complete blood count (CBC) Red blood cell folate... Read more »
Source: ADAM Encyclopedia
Anemia - iron deficiency Symptoms Blue color to whites of the eyes Brittle nails Decreased appetite ... Read more »
Source: ADAM Encyclopedia
Anemia - iron deficiency - childrenSymptomsBlue-tinged or very pale whites of eyesBlood in the stoolsBrittle nailsDecreased appetite (especially in... Read more »
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 »