Acommon cause of iron deficiency anemia in adulthood is

A common cause of iron deficiency anemia in adult hood is blood loss and lack of iron in the body. Blood loss is usually the cause because of bleeding in the GI tract, intestinal bleeding and chronic occult bleeding. Lack of iron in the body is also a cause because a body is in need of iron and if it does not exceed the required iron in the body, it may result to iron deficiency.

atp is used for energy.