There are two types of iron in food:
However, iron is poorly absorbed from foods. The body can absorb:
Iron from animal sources is better absorbed than that from other foods. This is because vegetable sources of iron, including wholegrains and beans, also contain salts (oxalates and phytates) that affect how well the body can absorb the iron. This means you need to eat a lot more to get the iron that your body requires.
Tannins from tea are another substance that can adversely affect iron absorption, especially in people that have poor diets and drink large amounts of strong tea. Oily fish and egg yolks are quite rich in iron, but also contain substances that affect your body's ability to absorb the iron.
How much iron the body can absorb also depends upon the presence of Vitamin C and folic acid, which improve your body's uptake of this mineral. All iron is better absorbed in the presence of Vitamin C. Eating plenty of fresh fruits, vegetables and salads, as well as drinking fresh juice in the morning can make a substantial difference to levels of iron in the blood.
Women need twice as much iron as men to compensate for their monthly blood loss, and they need even more during pregnancy to make sure that enough is passed to the baby and stored by the mother in preparation for breastfeeding. This means that many people can often become deficient in iron, especially women of child-bearing age and many children, who do not get enough iron from their food and are consequently likely to become anaemic, one of the commonest nutritional disorders.
Sources of iron include:
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