Jeffrey Salazar
Iron is an essential dietary mineral that helps maintain healthy blood by facilitating the transport of oxygen in the blood. A lack of iron can lead to iron-deficiency anaemia, which is characterised by symptoms such as fatigue and lowered immunity. Iron deficiency can be treated by including iron-rich foods in the diet, such as red meat, offal, and iron-fortified breakfast cereals. For pregnant and menstruating women, infants, children, and vegetarians, the risk of iron deficiency is higher, and they may need to pay closer attention to their iron intake. While iron supplements are available, excessive iron intake can be harmful, and it is generally recommended to obtain iron from a varied and balanced diet.
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What You'll Learn
Iron helps maintain healthy blood
Iron is an essential dietary mineral that helps maintain healthy blood. It is involved in various bodily functions, including the transport of oxygen in the blood, which provides energy for daily life. A lack of iron can lead to iron deficiency anaemia, causing fatigue and lowered immunity.
Iron deficiency anaemia is a common condition, affecting about 4-5 million Americans yearly. Certain groups are at a higher risk, including pregnant women, menstruating women with heavy periods, infants, children, the elderly, and vegetarians or vegans who do not include adequate iron sources in their diets.
To maintain healthy blood, the average person only needs to absorb a small amount of iron each day (around 1 mg for adult males and 1.5 mg for menstruating females). However, we need to consume several times this amount because our bodies only absorb a fraction of the iron from our food. The recommended dietary intake varies with different age groups and life stages.
Good sources of iron include red meat, offal, and iron-fortified breakfast cereals. For pregnant women, it is important to note that while offal is rich in iron, it should be consumed in moderation due to its high vitamin A content, which can cause birth defects in high amounts.
For vegetarians and vegans, it is possible to obtain sufficient iron through careful dietary planning. Combining foods rich in non-heme iron, such as beans, lentils, and spinach, with vitamin C-rich foods can enhance iron absorption. However, certain factors can inhibit iron absorption, including phytates and fibres found in whole grains, as well as calcium and phosphorus when consuming plant-based iron sources.
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Iron deficiency can cause anaemia
Iron is an essential dietary mineral that supports various bodily functions, including the transport of oxygen in the blood. Iron deficiency occurs when the body's iron levels are insufficient, which can be caused by various factors, such as blood loss, an inadequate iron intake, or impaired iron absorption. This can lead to a condition known as iron deficiency anaemia, which is characterised by a reduction in the number of red blood cells and the amount of oxygen carried in the blood.
Iron deficiency anaemia is a common blood disorder that can result in a range of symptoms, including fatigue, shortness of breath, chest pain, and an increased risk of infections. It is typically diagnosed through a combination of medical history, physical examination, and blood tests that measure haemoglobin and iron levels. In some cases, bone marrow aspiration or biopsy may also be performed to confirm the diagnosis.
Women with heavy menstrual periods are at a higher risk of developing iron deficiency anaemia due to the loss of blood and iron during menstruation. Additionally, certain gastrointestinal abnormalities, such as inflammatory bowel disease, ulcers, or colon cancer, can cause chronic blood loss and contribute to the development of iron deficiency anaemia.
The treatment for iron deficiency anaemia focuses on addressing the underlying cause and increasing iron levels in the body. This can be achieved through dietary modifications, such as incorporating iron-rich foods like red meat, offal, poultry, fish, leafy greens, and iron-fortified cereals or supplements. In more severe cases, intravenous iron administration or blood transfusions may be recommended to rapidly increase iron and red blood cell levels.
It is important to note that iron deficiency anaemia can lead to serious health complications if left untreated. These complications include heart problems, such as an irregular heartbeat, enlarged heart, or heart failure, as well as pregnancy complications, growth delays in children, and an increased susceptibility to infections. Therefore, it is crucial to seek medical advice if anaemia is suspected, and to maintain a balanced diet that includes adequate sources of iron.
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Iron-rich foods and supplements
Iron is a mineral that helps carry oxygen throughout your body, and getting enough is important for growth and development. Most people should be able to get all the iron they need by eating a varied and balanced diet. However, iron deficiency can lead to anaemia, a condition in which there is a lower-than-normal number of red blood cells in the body. Women who lose a lot of blood during their monthly period are at higher risk of iron deficiency anaemia and may need to take iron supplements.
Iron-rich foods include:
- Lean meat and poultry
- Seafood, such as salmon, flatfish (e.g. flounder), tilapia, shrimp, catfish, crab, trout, haddock, oysters, sardines, squid, pollock, anchovies, crawfish, mullet, scallops, whiting, clams, shad, and Atlantic mackerel
- White beans, kidney beans, lentils, peas, and other pulses
- Nuts and dried fruits
- Green leafy vegetables, such as spinach
- Fortified bread and breakfast cereals
The body can absorb iron from plant foods better when eaten with meat, poultry, seafood, and foods high in vitamin C, such as oranges, strawberries, tomatoes, and broccoli.
If your iron levels are low, your healthcare provider may recommend an oral iron supplement, such as ferrous sulfate, to increase the levels of iron and haemoglobin in your body. Iron supplements usually come in tablet or liquid form and should be taken as directed by your doctor or healthcare provider. It is important not to take more or less than the recommended amount, and to keep iron supplements out of the reach of children, as very high doses can be fatal.
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Iron requirements vary by life stage
Iron requirements do indeed vary by life stage. The average person only 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, since our bodies absorb only a fraction of the iron contained in food, we need to consume several times that amount.
Iron is important for transporting oxygen in the blood, which provides energy for daily life. Iron is lost from the body through sweat, intestinal cell shedding, and blood loss. Common causes of iron deficiency include not getting enough iron in your diet, chronic blood loss, pregnancy, and vigorous exercise. Women who lose a lot of blood during their monthly period (heavy periods) are at higher risk of iron deficiency anaemia and may need to take iron supplements.
The Australian recommended dietary intake (RDI) for iron is the amount of dietary iron required to meet the needs of most of the population. This amount is different for different age groups and life stages. For example, the RDI for children aged 9-13 years is lower compared to those aged 1-8 years, reflecting the high variability in requirements within younger age groups. The RDI for girls assumes that those younger than 14 years do not menstruate and that all girls 14 years and older do menstruate.
For adults, the estimated average requirement (EAR) for absorbed iron was set by modelling the components of iron requirements, with an upper limit of 18% iron absorption. The recommended daily intake (RDI) was then set by estimating the requirement for absorbed iron at the 97.5th centile, with the same upper limit for absorption. The large difference between the EAR and the RDI in women aged from 19-50 years reflects high variability in needs related to variability in menstrual losses.
During pregnancy, iron requirements increase due to the need for iron accretion in the growing foetus and placenta. Pregnant women should be careful to avoid consuming too much offal, as it contains large amounts of vitamin A, which can cause birth defects. However, offal products such as liver and kidney are particularly rich in haem iron, which is the most easily absorbed form of iron.
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Iron absorption can be affected by other foods
Iron is an essential dietary mineral that helps transport oxygen in the blood. Iron deficiency can lead to iron deficiency anaemia, which affects about 25% of the world's population. 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, since our bodies absorb only a fraction of the iron from food, we need to consume several times the recommended amount.
Secondly, certain vitamins and minerals can enhance or hinder iron absorption. Vitamin C, found in citrus fruits, dark green leafy vegetables, bell peppers, melons, and strawberries, has been shown to improve iron absorption. Eating high-iron foods with vitamin C-rich foods or drinking citrus juice alongside can increase iron absorption. Vitamin A and beta carotene, found in carrots, sweet potatoes, spinach, kale, and red peppers, also help release stored iron, thereby preventing iron deficiency anaemia. On the other hand, phytates and fibres in wholegrains can reduce iron absorption. Additionally, calcium-rich foods like dairy products, sardines, tofu, and broccoli can interfere with short-term iron absorption, although consuming less than 50mg of calcium has minimal impact.
Furthermore, certain compounds in foods can block iron absorption. Oxalic acid, commonly found in plant-based foods like spinach, soy, wheat, and tea, reduces iron absorption. Cooking these foods may help lower the oxalate content. Egg yolks contain phosvitin, which can inhibit iron absorption by up to 30%, so limiting egg yolk intake or consuming egg whites instead may be beneficial for raising iron levels. Research also suggests that polyphenols, found in vegetables, fruits, cereals, legumes, cocoa, tea, wine, and coffee, can interfere with iron absorption.
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Frequently asked questions
Iron is an important dietary mineral that helps maintain healthy blood by transporting oxygen in the blood.
A lack of iron is called iron-deficiency anaemia, which can make you feel tired and lower your immunity.
People at risk of iron deficiency include menstruating women, pregnant women, infants, children, the elderly, vegetarians and vegans, and people with poor diets.
Good sources of iron include red meat, offal, iron-fortified breakfast cereals, and plant foods such as beans, lentils, and spinach.
