It's needed: for aerobic metabolism (oxygen must be present); by a variety of enzymes in the metabolism of energy; for liver detoxification; to protect cells from damage; to make adenosine triphosphate (ATP), a substance that helps fuel cells; and by the neurotransmitter systems, such as serotonin, that help with sleep and brain function. Low iron can also lead to the accumulation of toxic metals including lead and cadmium which can create additional medical problems of their own.
(Journal of Pediatrics 1990, American Journal of Public Health 2002)


Why Does Iron Deficiency Rob Us Of Our Get Up And Go?
Just as a fire can't burn if we cut off its supply of oxygen, a shortage of iron in the blood means that our cells are deprived of the oxygen they need to burn the body's fuel. The problem is further compounded since iron is required to produce the ATP our cells use for fuel. With too little oxygen and too little fuel, instead of running on all eight cylinders, we run on two or three, and sputter through our day.