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This article addresses a sensitive health topic. Content has been reviewed for clinical accuracy and cultural appropriateness in accordance with Korea's healthcare regulations.
This content is published by DoctorsInKorea.com for educational purposes only and does not constitute medical advice. Always consult a licensed KMA physician for personalised guidance.
Iron deficiency is the world's most common nutritional deficiency and a leading cause of anaemia in Korea, particularly affecting women of childbearing age and young children.
Iron is essential for producing haemoglobin — the protein in red blood cells that carries oxygen. Without adequate iron, the body cannot make enough healthy red blood cells, leading to iron deficiency anaemia.
In Korea, iron deficiency is particularly prevalent among women of childbearing age (due to menstrual blood loss and increased demands during pregnancy), young children, vegetarians and vegans, and people who frequently donate blood.
There are two types of dietary iron: haem iron (from animal sources — meat, poultry, fish) which is easily absorbed at around 25% absorption rate; and non-haem iron (from plant sources — lentils, spinach, chickpeas, fortified cereals) which is absorbed at only 5–12%.
To maximise iron absorption from plant sources, combine iron-rich foods with vitamin C — for example, add citrus or peppers to a spinach namul side dish. Conversely, avoid drinking tea or coffee with iron-rich meals as tannins significantly reduce absorption. Calcium supplements and dairy can also inhibit iron absorption if taken simultaneously.
Red meat, organ meats (liver), seafood, and dark poultry are the richest haem iron sources. Among plant foods, lentils, kidney beans, dark leafy greens (spinach, perilla leaves), tofu, pumpkin seeds, and fortified breakfast cereals are excellent sources widely available in Korea.
In cases of confirmed iron deficiency anaemia, dietary changes alone may be insufficient and iron supplementation is usually required.
Key Points
- Most common nutritional deficiency worldwide — especially in women and children
- Haem iron (meat/fish) is absorbed much more efficiently than non-haem iron (plants)
- Vitamin C consumed with meals doubles iron absorption from plant sources
- Tea, coffee, and calcium reduce iron absorption — avoid with iron-rich meals
- Red meat, lentils, spinach, and dark leafy greens are top sources
- Blood test (serum ferritin) is the best way to diagnose deficiency
Causes & Risk Factors
- Inadequate dietary intake, particularly vegetarian or vegan diets
- Increased iron demands during pregnancy and breastfeeding
- Heavy menstrual periods
- Poor absorption due to coeliac disease or inflammatory bowel conditions
- Frequent blood donations
- Rapid growth periods in infants and adolescents
When to See a Doctor
- Persistent fatigue, weakness, or shortness of breath
- Pale skin, brittle nails, or hair loss
- Chest pain or rapid heartbeat
- Unusual cravings for non-food items (ice, dirt) — known as pica
- If you are pregnant — routine iron testing is part of antenatal care in Korea
For emergencies in Korea, call 119
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This content is published for educational purposes only. For accurate diagnosis and personalised treatment, consult a licensed KMA physician in Korea.
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Medical Disclaimer
This article is published by DoctorsInKorea.com for educational and informational purposes only. It does not replace a professional clinical evaluation by a licensed healthcare provider. For accurate medical diagnosis and personalised treatment paths, please book an appointment with a licensed KMA physician. For immediate life-threatening medical emergencies in Korea, please call 119.
Sources & References
Last reviewed: April 1, 2026