Iron deficiency is a silent health crisis affecting women worldwide, and Australia is no exception. With anaemia being a late-stage symptom, many women suffer from fatigue, poor concentration, and irritability long before their haemoglobin levels drop. This is a critical issue that needs immediate attention.
Iron is an essential mineral, playing a vital role in our bodies' production of haemoglobin, oxygen transport, DNA synthesis, and muscle metabolism. Unlike other nutrients, our bodies cannot produce iron, making dietary intake absolutely crucial. To address this, MLA Healthy Meals has developed online resources to educate patients about iron and its importance.
The Australian Iron Deficiency Landscape:
Prevalence: The World Health Organization reports that globally, 30% of women aged 15-49 suffer from anaemia. In Australia, this figure is 11% for non-pregnant women and 14% for pregnant women. Alarmingly, nearly half of pregnant Aboriginal and Torres Strait Islander women experience iron deficiency anaemia.
Iron Stores: According to the Australian Bureau of Statistics, teenage girls have median ferritin levels around 25 µg/L, indicating insufficient iron reserves. Among women aged 18-39, 35-37% have ferritin levels below 30 µg/L, often linked to heavy menstrual bleeding.
Dietary Intake: The latest National Nutrition survey reveals a shocking reality - women consume approximately 50% less iron than the recommended daily intake (RDI).
Teenage girls: RDI 15 mg/day vs actual ~9 mg/day
Women 19-50 years: RDI 18 mg/day vs actual ~8.5-9 mg/day
Pregnancy: RDI 27 mg/day (intake data unavailable)
- Vegetarians: The National Health and Medical Research Council notes that vegetarians require 80% more iron due to its lower bioavailability in their diets.
Why Are Women at Risk?
Blood Loss: Heavy menstrual bleeding is the primary cause of iron deficiency in Australia. Women typically lose around 40-50ml of blood per cycle, equivalent to ~25 mg of iron. Between 25-53% of women experience this, and they are more likely to report iron deficiency symptoms and have a history of anaemia.
Physiological Demands: Children, adolescents, pregnant women, and athletes have increased iron needs to support growth and development. A low iron intake puts them at risk.
Dietary Patterns: Lower iron intakes are mainly from non-haem sources (fortified cereals and grains) which are not as easily absorbed as haem sources.
Diagnosing Iron Deficiency:
- Ferritin <30 µg/L: Indicates insufficient iron stores.
- Haemoglobin <120 g/L (or <110 g/L in pregnancy): Suggests anaemia.
- Serum transferrin receptor and CRP: Useful for complex cases.
How GPs Can Make a Difference:
Screen and Diagnose:
- Ask women about fatigue, heavy menstrual bleeding, and their dietary iron intake.
- Use specific screening questions for heavy menstrual bleeding.
- Encourage routine ferritin checks for women with symptoms or in high-risk groups.
Educate Patients:
- Explain the difference between haem and non-haem iron, and strategies to enhance absorption:
- Pair iron-rich foods with vitamin C.
- Limit inhibitors like tea, coffee, and calcium around iron-rich meals.
- Dietary iron comes in two forms: haem iron (found in animal sources) and non-haem iron (plant sources). Absorption rates vary and are influenced by iron status and meal composition.
- On average, 25% of haem iron is absorbed, compared to 10% for non-haem iron. This percentage increases as body iron stores decrease.
- Vitamin C enhances absorption, while phytates, calcium, tannins, and certain medications (like proton pump inhibitors) can inhibit it.
- Explain the difference between haem and non-haem iron, and strategies to enhance absorption:
Promote Iron-Rich Balanced Meals:
- Including lean red meat (up to 3-4 times per week) as part of a healthy diet can help meet iron intake goals. The Australian Dietary Guidelines recommend up to 65g per day (a maximum of 455g cooked lean red meat per week).
- Encourage a balanced approach with seafood, legumes, leafy greens, nuts, and fortified cereals.
Prioritise High-Risk Groups:
- Teenage girls: Educate them about iron needs during menstruation, especially for athletes.
- Pregnant women: Early screening, dietary counselling, and supplementation are crucial.
- Perimenopausal women: Screen for heavy menstrual bleeding.
- Vegetarians/Vegans: Provide practical meal plans to meet their iron requirements.
- Indigenous women: Support culturally relevant nutrition programs.
Consider Supplementation: In some cases, iron supplements may be necessary to quickly boost iron levels.
Key Takeaways for GPs:
- Iron deficiency is common and often overlooked in Australian women.
- Blood loss and low dietary iron intake are major contributors.
- Screening, education, and targeted interventions can significantly improve iron status.
- Collaboration with dietitians can greatly enhance patient outcomes.
This article was authored by Monique Cashion, an Accredited Practising Dietitian and Group Manager at Meat & Livestock Australia. The opinions expressed reflect the author's views and do not necessarily represent the official policy of the AMA, theMJA, or InSight+. To stay informed, subscribe to the free InSight+ weekly newsletter. If you'd like to contribute an article, send a Word version to mjainsight-editor@ampco.com.au.
