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a lack or shortage; a condition characterized by the presence of less than the normal or necessary supply or competence.
deficiency disease a condition due to dietary or metabolic deficiency, including all diseases caused by an insufficient supply of essential nutrients.
deficiency of iron in the system, as from blood loss, low dietary iron, or a disease condition that inhibits iron uptake. See iron
and iron deficiency anemia
iron deficiency A relative or absolute deficiency of iron which may be due to chelation in the GI tract, loss due to acute or chronic hemorrhage or dietary insufficiency Sources Meat, poultry, eggs, vegetables, cereals, especially if fortified with iron; per the National Academy of Sciences, RDA of iron is 15 mg/day for ♀, 10 mg/day for ♂