Iron

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Image for iron Iron is a mineral that is found in every living cell. Iron exists in two forms—heme and nonheme. Heme iron is part of the hemoglobin and myoglobin molecules in animal tissues. Nonheme iron comes from animal tissues other than hemoglobin and myoglobin and from plant tissues. Iron is found in meats, eggs, milk, vegetables, grains, and other plant foods. The body absorbs heme iron much more efficiently than nonheme iron. Much of the iron in our diet comes from foods, such as breads and cereals that are fortified with this mineral. Worldwide, iron deficiency anemia is the most common form of malnutrition.

Functions

Iron's functions include:
  • In hemoglobin, carrying oxygen to cells throughout the body
  • In myoglobin, holding oxygen within the cells, especially heart and skeletal muscle cells
  • Forming collagen, which is the major protein that makes up connective tissue, cartilage, and bone
  • Helping fight infection by synthesizing certain enzymes needed for immune function
  • Helping convert beta carotene to vitamin A
  • Helping make amino acids, which are the building blocks of protein
  • Aiding drug detoxification pathways in the liver
  • Forming part of an enzyme that is essential for the production of several neurotransmitters
  • Synthesizing cellular components that are important to metabolism

Recommended Intake

Iron needs are greatest during times of rapid growth—childhood, adolescence, and pregnancy. Also, women have higher requirements than men, to replace the iron that is lost with monthly menstruation.
Age Group Recommended Dietary Allowance (RDA)
(mg/day)
Male Female
0-6 months No RDA;
Adequate Intake (AI) = 0.27
No RDA;
Adequate Intake (AI) = 0.27
7-12 months 11 11
1-3 years 7 7
4-8 years 10 10
9-13 years 8 8
14-18 years 11 15
19-50 years 8 18
51+ years 8 8
Pregnancy n/a 27
Lactation, equal to or less than 18 years n/a 10
Lactation, 19-50 years n/a 9

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