Recent research has expanded this constant to «106 C: 16 N: 1 P:.001 Fe» signifying that in
iron deficient conditions each atom of iron can fix 106,000 atoms of carbon, or on a mass basis, each kilogram of iron can fix 83,000 kg of carbon dioxide.
2) Men and post-menopausal women (in particular) may become
iron deficient due to gastrointestinal blood loss from digestive
conditions like ulcers, Crohn's disease, ulcerative colitis, irritable bowel syndrome, colon cancer and other digestive disorders.