Leena Watts
Iron is an essential mineral that the human body needs for growth and development. It is a key component of hemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. Iron is also important for healthy muscles, bone marrow, and organ function, and it plays a crucial role in brain development and the production of certain hormones. A lack of iron can lead to iron deficiency anemia, which is the most common nutritional deficiency worldwide, causing symptoms such as fatigue, lightheadedness, and shortness of breath. The recommended daily intake of iron varies depending on age, sex, and dietary preferences, but most people should be able to obtain sufficient iron through a varied and balanced diet, including foods like lean meat, fish, poultry, beans, dark leafy greens, and vitamin C-rich fruits and vegetables.
| Characteristics | Values |
|---|---|
| Importance in the body | Iron is needed to make hemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. |
| Iron is also a component of myoglobin, a protein that carries and stores oxygen in muscle tissues. | |
| Iron is important for healthy muscles, bone marrow, brain development, and organ function. | |
| Iron is needed for the normal production and function of various cells and hormones. | |
| Recommended Dietary Allowance (RDA) | The RDA for adults 19-50 years is 8 mg daily for men, 18 mg for women, 27 mg for pregnant women, and 9 mg for lactating women. |
| Adolescents 14-18 years need higher iron intake: 11 mg for boys, 15 mg for girls, 27 mg for pregnancy, and 10 mg for lactation. | |
| The RDA for women 51+ years drops to 8 mg, assuming menopause has occurred. | |
| Sources | Iron is found naturally in many foods, including lean meat, fish, poultry, beans, dark leafy greens, lamb, pork, and shellfish. |
| Iron is also added to some fortified food products and is available in supplement form. | |
| Foods rich in vitamin C, such as citrus fruits, strawberries, tomatoes, and potatoes, can increase iron absorption. | |
| Deficiency | Iron deficiency, or anemia, is the most common nutritional deficiency worldwide, affecting about 4-5 million Americans yearly. |
| It is caused by a lack of iron in the diet, blood loss, or a problem with absorbing iron from foods. | |
| Symptoms include extreme fatigue, lightheadedness, lack of energy, shortness of breath, headache, irritability, dizziness, and weight loss. | |
| Physical signs include a pale tongue and spoon-shaped nails. | |
| Excess iron | The genetic disorder hemochromatosis affects the body's ability to control iron absorption, leading to excess iron in the body. |
| Children may be at risk of iron poisoning if they swallow too many iron supplement pills or liquid. |
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What You'll Learn
Iron deficiency anaemia
Iron is an essential mineral for maintaining healthy blood. Iron deficiency, or lack of iron, can lead to iron-deficiency anaemia, a common type of anaemia. This condition affects about 4-5 million Americans annually and is the most prevalent nutritional deficiency worldwide. It can cause extreme fatigue, lightheadedness, shortness of breath, and chest pain.
Iron-deficiency anaemia occurs when the body does not have sufficient iron to produce haemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. Without enough iron, there is a decrease in red blood cells, resulting in insufficient oxygen delivery to the body's tissues. This can lead to the aforementioned symptoms associated with iron-deficiency anaemia.
Certain individuals are at a higher risk of developing iron-deficiency anaemia. These include women, particularly those with heavy menstrual periods, infants and children, vegetarians who do not consume iron-rich foods, and frequent blood donors. Additionally, specific conditions and medications can hinder iron absorption, increasing the risk of anaemia.
To diagnose iron-deficiency anaemia, a doctor will typically order a blood test to check complete blood count, haemoglobin levels, blood iron levels, and ferritin levels. Treatment for this condition primarily involves iron supplementation to increase iron levels in the body. Maintaining a healthy diet that includes good sources of iron, such as beans, lean red meat, and dark green leafy vegetables, is also crucial for preventing and managing iron-deficiency anaemia.
It is important to note that self-diagnosis and treatment of iron-deficiency anaemia are not recommended. Consulting a doctor for diagnosis and following their advice on iron supplementation is essential to ensure safe and effective management of the condition.
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Iron-rich foods
Iron is an essential mineral that helps maintain healthy blood and prevents anaemia. It is a major component of haemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. A lack of iron can lead to iron deficiency anaemia, causing extreme fatigue and lightheadedness.
To ensure adequate iron intake, it is recommended to consume a varied and balanced diet that includes iron-rich foods. The two main types of iron are heme and non-heme iron. Heme iron, which is more easily absorbed by the body, is commonly found in liver, meat, poultry, and seafood. Non-heme iron sources include legumes (beans), nuts, seeds, and certain vegetables like spinach and potatoes. Fortified foods such as tofu, grains, bread, and cereal are also good sources of non-heme iron.
Heme Iron Sources:
- Liver
- Meat
- Poultry
- Seafood
Non-Heme Iron Sources:
- Legumes (beans, peas, lentils)
- Nuts
- Seeds (pumpkin, sesame, flax, hemp)
- Vegetables (spinach, potatoes, dark leafy greens like kale and collards)
- Fortified foods (tofu, grains, bread, cereal)
- Dried or canned beans (kidney, garbanzo, cannellini, soybeans)
- Tempeh (fermented soybeans)
- Enriched pasta and rice
- Wheat products
- Bran and oat cereals
- Prunes and prune juice
- Tomato paste
- Blackstrap molasses
- Pistachios
- Macadamia nuts
It is important to note that the Recommended Dietary Allowance (RDA) for iron varies based on age, sex, and life stage. For example, the RDA for adult men aged 19-50 years is 8 mg daily, while it is 18 mg for women of the same age group due to blood loss through menstruation. Adolescents, pregnant women, and lactating women also have different iron requirements.
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Iron supplements
Iron is an essential mineral that helps maintain healthy blood. A deficiency in iron can lead to iron-deficiency anaemia, which affects about 4-5 million Americans annually. This condition is caused by a lack of red blood cells, which carry oxygen around the body. It can cause extreme fatigue and lightheadedness.
It is important to take iron supplements as directed by a healthcare professional. They are typically taken on an empty stomach, at least one hour before or two hours after eating a meal. This is because iron is better absorbed when taken without food. However, taking iron supplements on an empty stomach can cause digestive issues such as nausea, stomach cramps, and diarrhoea. In this case, it may be beneficial to take the supplement with food. However, it is important to note that iron supplements should not be taken with milk, caffeine, antacids, calcium supplements, or high-fibre foods, as these can interfere with iron absorption. To improve absorption, it is recommended to take iron supplements with vitamin C or orange juice.
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Iron requirements
Iron is an essential mineral required to make haemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. Myoglobin, a protein that carries and stores oxygen in muscle tissues, also contains iron. Iron is also important for healthy muscles, bone marrow, and organ function, and the body needs it to make some hormones. It is further required for healthy brain development and growth in children.
The Recommended Dietary Allowance (RDA) for iron varies according to age, sex, and diet. For adults aged 19-50, the RDA is 8 mg daily for men and 18 mg for women. During pregnancy, the RDA increases to 27 mg, and it is 9 mg for lactation. Adolescents aged 14-18 years who are actively growing also need higher iron intakes: 11 mg for boys and 15 mg for girls. The RDA for women over 50 drops to 8 mg, assuming menopause has occurred. However, if a woman is still menstruating after 50, she may need the same amount of iron as women aged 19-49.
Iron is found naturally in many foods, including meat, fish, poultry, beans, dark leafy greens, and fruits and vegetables rich in vitamin C, such as citrus, strawberries, tomatoes, and potatoes. It is also added to some fortified food products, such as cereals and multivitamin/mineral supplements. Most people should be able to get all the iron they need by eating a varied and balanced diet. However, some people may need to take iron supplements if they are at risk of or have been diagnosed with iron-deficiency anaemia. This condition affects about 4-5 million Americans yearly and can cause extreme fatigue, lightheadedness, lack of energy, shortness of breath, headache, irritability, dizziness, and weight loss. Physical signs of iron deficiency include a pale tongue and spoon-shaped nails.
It is important to note that taking too much iron in supplement form can be harmful. The Tolerable Upper Intake Level, or the maximum daily intake unlikely to cause harmful effects on health, is 17 mg per day. However, continue taking a higher dose if advised by a healthcare professional. Common side effects of high-dose iron supplements include constipation and nausea.
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Iron absorption
Iron is an essential mineral that helps maintain healthy blood. Iron is a major component of haemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body. Iron is also a component of myoglobin, a protein that carries and stores oxygen in muscle tissues. A lack of iron can lead to iron-deficiency anaemia, which is the most common nutritional deficiency worldwide, causing extreme fatigue and lightheadedness.
Iron from food is absorbed into the bloodstream in the small intestine. The body does not absorb all types of iron equally. Heme iron is found in animal products such as meat, poultry, and fish, and is more easily absorbed by the body. Non-heme iron is found in plant sources, and the body does not absorb it as well. Thus, vegetarians and vegans may be at a higher risk of developing anaemia.
To increase iron absorption, one can include foods that are high in vitamin C or ascorbic acid in the same meal as iron-rich foods. Foods rich in vitamin C include citrus fruits, dark green leafy vegetables, bell peppers, melons, and strawberries. Vitamin A and beta carotene may also help with iron absorption. Foods rich in beta carotene and vitamin A include carrots, sweet potatoes, spinach, kale, squash, red peppers, cantaloupe, apricots, oranges, and peaches. Meat, fish, and poultry not only provide well-absorbed heme iron but also stimulate the absorption of the non-heme form.
Tea may inhibit iron absorption as it contains tannins, which may reduce iron absorption, especially in adults with low iron stores. Calcium may also hinder iron absorption, so calcium-rich foods should be avoided with meals that provide most of the dietary iron. Phytate, or phytic acid, found in whole grains, cereals, soy, nuts, and legumes, can also decrease iron absorption. However, the negative effect of phytate can be counteracted by consuming foods that enhance non-heme iron absorption, such as vitamin C or meat.
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