IRON WE CONSUME

Iron We Consume

Humans can get iron from shots (injection) or IV (intravenous). They can also get iron from blood transfusions or by consuming (eating) iron that is in their food, or iron pills.

People consume two types of iron: non-heme and heme

Non-heme iron comes primarily from plants and heme iron comes primarily from meat. Plants can contain tiny traces of heme iron but not enough to make a difference and as a rule, these plants are not types that we eat.

Meat contains both types of iron. About 55-60% of the iron in meat is non-heme, the rest is heme iron.

Non-heme iron represents the majority of iron humans consume in their diets and is the type of iron in most supplements. Non-heme type of iron is found in greatest quantities in grains such as rice, wheat, and oats. Non-heme iron is also found in nuts, fruits, vegetables, most iron pills, fortified foods, or contaminant iron such as from water, soil or cooking utensils. Meat also contains non-heme iron. Unlike heme iron, non-heme iron must be changed before it can be absorbed.

Meat, especially red meat, is the best source of heme iron. When we eat meat we consume the blood proteins, the hemoglobin and myoglobin contained in the flesh of the animal. Heme iron is easily absorbed by the body and the best source of iron for people who are iron deficient. Too much heme iron in the diet can increase the risk of disease for some people with abnormal iron metabolism such as hemochromatosis.

Many substances can reduce the amount of non-heme iron we absorb; these substances include tannins in coffee or tea, dairy, phytates (fiber), eggs and some types of chocolate. Calcium can impair the absorption of both non-heme and heme iron. Therefore if a person needs more iron, he or she should avoid these items to improve the amount of iron absorbed. But if a person has a problem with too much iron, he or she can use these items to help lower the amount of iron absorbed.

Read more about iron absorption in the diet section

Too little iron or too much iron changes the way we grow, develop and function.