Milly Gaines
Iron is an essential mineral nutrient that helps the body function normally. Iron is necessary for forming healthy red blood cells, which carry oxygen through the body, and is a critical part of haemoglobin. Iron is also important in preventing anaemia. The amount of iron one needs depends on their age, sex, and life stage. For example, babies, children, and teenagers require more iron due to rapid growth spurts. Similarly, women who are pregnant or menstruating need a higher iron intake. On the other hand, people with certain conditions, such as gum disease or bowel cancer, may be at risk of iron deficiency due to blood loss. Athletes are also prone to iron deficiency due to increased red blood cell production and iron loss through sweating.
| Characteristics | Values |
|---|---|
| People who need iron in their diet | Athletes, babies, children, toddlers, teenagers, women with heavy menstrual cycles, pregnant women, breastfeeding women, people over 50, people with intestinal parasites, people with poor diets, people with conditions that cause bleeding |
| Why they need iron | To prevent iron deficiency, which can cause fatigue and lower immunity; to prevent anaemia; to promote healthy red blood cell production; to compensate for iron loss through sweating |
| How much iron do they need? | Menstruating females: 1.5 mg/day; adult males: 1 mg/day; pregnant women: 27 mg/day; people over 50: 8 mg/day |
| How to get iron | Haem iron: meat, poultry, fish, offal; non-haem iron: plant-based foods (fruits, vegetables, nuts), eggs |
| How to increase iron absorption | Consume vitamin C-rich foods like citrus fruits, tomatoes, peppers, and broccoli |
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What You'll Learn
Iron deficiency and anaemia
Iron is an essential mineral that the human body needs to produce red blood cells and carry oxygen throughout the body. Iron deficiency anaemia occurs when the body does not have enough iron to produce a substance called haemoglobin, which is found in red blood cells and carries oxygenated blood.
Iron deficiency anaemia is a common condition, especially among certain groups of people who are at a higher risk. Women who are pregnant, breastfeeding, or menstruating are more susceptible to iron deficiency anaemia due to increased blood volume and blood loss. Infants and children, especially those with low birth weight or premature births, may also be at risk if they do not receive adequate iron from breast milk, formula, or a healthy, varied diet. Vegetarians and vegans should also be mindful of their iron intake, as they may be at higher risk if they do not consume iron-rich foods.
There are several factors that can contribute to iron deficiency anaemia. One of the main causes is a lack of iron in the diet. Iron-rich foods include meat, eggs, leafy green vegetables, beans, dried fruits, salmon, iron-fortified foods, and more. Certain intestinal disorders, such as celiac disease, can also affect the body's ability to absorb iron from food. Additionally, blood loss through gastrointestinal bleeding, inflammatory conditions, or regular blood donation can deplete iron stores.
The symptoms of iron deficiency anaemia are related to decreased oxygen delivery throughout the body. Common symptoms include fatigue, shortness of breath, and a general feeling of being unwell. In some cases, iron deficiency anaemia may initially go unnoticed, but as the body becomes more deficient, the signs and symptoms intensify. It is important to consult a doctor for a proper diagnosis and treatment plan.
To diagnose iron deficiency anaemia, a doctor will typically order blood tests to check complete blood count, haemoglobin levels, blood iron levels, and ferritin levels. Treatment for iron deficiency anaemia usually involves iron supplementation to increase iron levels in the body. It is important to note that self-diagnosis and self-treatment are not recommended, and seeking medical advice is essential.
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Iron-rich foods
Iron is an essential mineral that helps carry oxygen throughout the body and is important for growth and development. It also helps prevent anaemia and protects the body from infection. The average person needs to absorb a small amount of iron each day to stay healthy (around 1 mg for adult males and 1.5 mg for menstruating females). However, we need to consume several times that amount because our bodies can only absorb a fraction of the iron from food.
There are two main types of iron: heme and non-heme. Heme iron is derived from haemoglobin and is found in animal tissue such as beef, lamb, chicken, and fish. It is also present in offal products like liver and kidney, which are particularly rich sources of heme iron. Heme iron is more readily absorbed by the body.
Non-heme iron is found in plant-based foods such as fruits, vegetables, legumes, nuts, and seeds. While non-heme iron is not absorbed as efficiently as heme iron, it is still an important part of a nutritious and well-balanced diet. Foods containing non-heme iron include dried or canned beans, peas, soybeans, lentils, chickpeas, spinach, potatoes, broccoli, tomatoes, citrus fruits, peppers, and whole grains.
To enhance the absorption of non-heme iron, pair it with foods high in vitamin C, such as tomatoes, citrus fruits, peppers, oranges, berries, kiwifruit, and broccoli. Additionally, consuming heme iron alongside non-heme iron sources can improve the overall absorption of iron.
It is important to note that certain factors can increase the risk of iron deficiency. For example, athletes and individuals who exercise regularly may have higher iron requirements due to increased red blood cell production and iron loss through sweating. Babies, children, and teenagers also have higher iron needs during rapid growth spurts. Furthermore, those with diets lacking in vitamin A or those consuming excessive calcium and phosphorus may be at risk of inadequate iron absorption.
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Exercise and iron
Exercise increases the body's need for iron. Hard training promotes red blood cell production, which requires iron, and iron can also be lost through sweating. Certain types of exercise can increase the risk of developing iron deficiency anaemia, especially if precautions aren't taken. This includes sports anaemia, which is common in powerlifters and endurance athletes. Iron loss can occur through sweating, gastrointestinal bleeding, and hemolysis (the breakdown of red blood cells).
Athletes are at a greater risk of being iron deficient compared to the general population. Female athletes are particularly susceptible, with up to 35% having an iron deficiency, compared to 5% of the general population. Regular exercise can increase the likelihood of an iron deficiency. This is due to an increased inflammatory response in the body post-exercise, which can decrease the body's ability to absorb iron for 3-6 hours.
If you have anaemia, exercise can help increase energy levels and reduce symptoms such as tiredness and weakness. However, it is important to be mindful of the type of exercise and intensity. Low to moderate-intensity activities are recommended, such as yoga, swimming, walking, light biking, or dancing. These exercises can help boost your mood, reduce tension, and improve your overall well-being.
To prevent exercise-induced anaemia, it is important to eat an iron-rich diet. Iron-rich foods include lean red meat, dried beans, lentils, chickpeas, canned beans, poultry, fish, eggs, and nuts. Vitamin C can also help with the absorption of iron, so be sure to include foods rich in vitamin C such as citrus fruits, tomatoes, and peppers.
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Vitamin C and iron absorption
Iron is an essential mineral needed for growth, brain development, and the production of various hormones and proteins. These include haemoglobin, which carries oxygen from the blood to the lungs and the rest of the body, and myoglobin, which transports oxygen to the muscles. The average person needs to absorb a small amount of iron each day to stay healthy (around 1 mg for adult males and 1.5 mg for menstruating females).
Iron is particularly important during pregnancy, as it supports foetal development. Women who are pregnant should take a daily prenatal vitamin and mineral supplement in addition to consuming a healthy, iron-rich diet. Getting too little iron during pregnancy increases the risk of iron deficiency anaemia for the mother and the infant's risk of low birth weight, premature birth, and low iron levels.
Athletes are also prone to iron deficiency as regular exercise increases the body's need for iron. For example, hard training promotes red blood cell production, which requires iron, and iron is lost through sweating.
Vitamin C helps the body absorb more iron. Foods rich in vitamin C include oranges, lemons, mandarins, berries, kiwifruit, tomatoes, cabbage, capsicum, and broccoli. Ascorbic acid, a form of vitamin C, is a powerful enhancer of non-heme iron absorption. Non-heme iron is found in plant-based foods such as fruits, vegetables, and nuts. The absorption of non-heme iron is also influenced by other components of a meal, such as tea, calcium, and phosphorus, which can inhibit its absorption.
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Risk factors for iron deficiency
Iron is an essential nutrient for human health, and iron deficiency can have adverse effects on overall well-being. Certain factors increase an individual's risk of developing iron deficiency, and understanding these risk factors is crucial for prevention and effective management.
Infants and Young Children
Infants and young children are particularly vulnerable to iron deficiency. The iron stored in full-term infants' bodies is typically used up within the first 4 to 6 months of life. Premature and low-birth-weight babies are at an even higher risk as they have lower iron reserves compared to full-term infants. Young children who consume excessive cow's milk may also be at risk because milk is low in iron, and it can interfere with the absorption of iron from other foods. Additionally, lead exposure, such as through lead-contaminated water or paint, can put children at risk for iron deficiency by inhibiting hemoglobin production.
Adolescents and Women of Childbearing Age
Adolescents, especially teenage girls, are at risk for iron deficiency anemia due to various factors. Dietary practices, including insufficient iron intake, can contribute to iron deficiency in this age group. Additionally, female adolescents who experience heavy menstrual bleeding are at a heightened risk as they lose more iron during their periods. This risk factor extends to women of childbearing age, as they also experience monthly blood loss through menstruation.
Pregnancy
Pregnant women are highly susceptible to iron deficiency anemia due to their increased iron requirements. During pregnancy, women need twice as much iron for their own increased blood volume and to support the growth of the fetus. About half of all pregnant women develop iron-deficiency anemia, which can, in turn, increase the risk of delivering a premature or low-birth-weight baby.
Dietary Factors
Dietary choices play a significant role in iron deficiency risk. Individuals who follow diets excluding meat and fish, which are rich sources of iron, may be at higher risk. While vegetarian diets can provide sufficient iron through plant-based sources like iron-fortified cereals, beans, tofu, dried fruits, and dark green leafy vegetables, improper dietary practices or financial constraints that limit access to nutritious foods can contribute to inadequate iron intake. Additionally, high-fiber diets can slow iron absorption, and excessive alcohol consumption can also increase the risk of iron deficiency.
Health Conditions and Treatments
Certain health conditions and medical treatments can increase the risk of iron deficiency anemia. Internal bleeding, such as intestinal bleeding, can lead to iron deficiency due to blood loss. Conditions like colon cancer and bleeding ulcers may cause such blood loss. Gastric bypass surgery may also lead to iron deficiency by impairing the body's ability to absorb sufficient iron. Moreover, individuals with chronic illnesses, including kidney disease, autoimmune diseases, or cancer, may have a higher risk of developing iron deficiency anemia.
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Frequently asked questions
Everyone needs iron in their diet. Iron is an essential nutrient that can only be obtained through food.
The amount of iron you need depends on your age, sex, and life stage. For instance, adult males need around 1 mg of iron per day, while menstruating females need 1.5 mg. Pregnant women should have an iron intake of 27 mg/day.
Good sources of iron include meat, poultry, fish, eggs, and nuts. These foods contain haem iron, which is easily absorbed by the body. Plant-based foods such as fruits, vegetables, beans, lentils, and chickpeas also contain non-haem iron, but it is not absorbed as efficiently by the body.
If you do not get enough iron in your diet, you may become iron deficient, also known as anaemia. Iron deficiency can make you feel tired and lower your immunity. It is recommended to include iron-rich foods in your diet or speak to a doctor or dietitian for advice.
