Iron is one of the most important nutrients during pregnancy. It plays a key role in producing haemoglobin - the protein in red blood cells that carries oxygen around the body. Helping to support both maternal health and the development of your baby.
During pregnancy, the body’s demand for iron increases significantly. In clinical practice, it’s also common to see women entering pregnancy with lower iron stores than expected. This is often due to years of menstrual blood loss or diets that don’t regularly include iron-rich foods. When pregnancy increases the body’s demand further, iron levels can sometimes drop more quickly than many women realise.
Iron-deficiency anemia is relatively common during pregnancy. In the UK, around 23% of pregnant women are estimated to experience anaemia, with iron deficiency being the most common cause.
But reasuringly, many everyday foods contain iron, and simple dietary strategies can help improve how well your body absorbs it. Understanding which foods provide iron - and how to optimise absorption - can help support healthy levels throughout pregnancy.
Why Iron Needs Increase During Pregnancy
Pregnancy brings remarkable changes to the body, including a substantial increase in blood volume. Maternal blood volume rises by roughly 40–50% during pregnancy so that oxygen and nutrients can be delivered to both the mother and the developing baby.
To support this process, the body must produce more red blood cells, which requires iron.
Across pregnancy, the body needs around 1,000 mg of additional iron to support:
- increased maternal red blood cell production
- the development of the placenta
- fetal growth
- normal physiological iron losses
Because the body prioritises supplying oxygen to the developing baby, even small declines in iron levels can sometimes lead to noticeable fatigue for the mother.
Understanding Heme vs Non-Heme Iron
Not all dietary iron is absorbed in the same way. There are two main types of iron found in food.
Heme Iron
Heme iron is found in animal-based foods such as:
- beef
- lamb
- poultry
- fish and seafood
This form of iron is generally more easily absorbed by the body, with absorption rates typically ranging between 15–35%.
Non-Heme Iron
Non-heme iron is found in plant foods including:
- lentils
- chickpeas
- tofu
- nuts and seeds
- leafy green vegetables
- whole grains
- fortified foods such as cereals
Non-heme iron absorption is lower and can vary depending on other foods eaten at the same meal. Plant-based diets can absolutely support a healthy pregnancy. However, because non-heme iron is less readily absorbed, meals often benefit from thoughtful combinations that help improve absorption.
The Best Iron-Rich Foods During Pregnancy
Including a variety of iron-rich foods throughout the week can help support iron intake naturally.
Animal Sources of Iron
Animal foods provide heme iron, which is easier for the body to absorb.
Examples include:
- Beef and lamb
- Chicken thighs
- Turkey
- Sardines and other oily fish
These foods also provide protein, zinc and vitamin B12, which help support red blood cell production.
Plant Sources of Iron
Plant foods can also provide meaningful amounts of iron.
Examples include:
- Lentils
- Chickpeas
- Kidney beans
- Tofu and tempeh
- Pumpkin seeds
- Sesame seeds
- Spinach and other leafy greens
These foods also contribute fibre, plant protein and a wide range of micronutrients.
Iron-Fortified Foods
Some everyday foods are fortified with iron, which can help increase intake.
Examples include:
- breakfast cereals
- fortified breads
- some oat products
Checking nutrition labels can help identify fortified options.
Including both heme and non-heme sources across the week can help support overall iron intake during pregnancy.
How to Improve Iron Absorption
The way foods are combined within a meal can influence how much iron the body absorbs.
Pair Iron with Vitamin C
Vitamin C significantly improves the absorption of non-heme iron.
Helpful combinations include:
- lentils with tomatoes
- spinach with lemon juice
- chickpeas with roasted peppers
- fortified cereal with berries
Even small amounts of vitamin C can help improve iron uptake.
Avoid Tea or Coffee with Iron-Rich Meals
Tea and coffee contain compounds called polyphenols and tannins, which can reduce iron absorption when consumed alongside meals. A simple strategy is to enjoy tea or coffee between meals rather than with them.
Be Mindful of Calcium Timing
Large amounts of calcium can temporarily reduce iron absorption. This doesn’t mean avoiding calcium-rich foods altogether - simply try not to consume large amounts of calcium at the same time as iron-rich meals.
Recognising Signs of Low Iron During Pregnancy
Fatigue is common during pregnancy, but iron deficiency can sometimes make symptoms more pronounced.
Possible signs of low iron include:
- persistent fatigue or low energy
- dizziness
- headaches
- pale skin
- shortness of breath
- heart palpitations
- restless legs
If you notice these symptoms, it’s important to discuss them with your healthcare provider.
Iron stores - measured by a marker called ferritin - often fall before haemoglobin levels drop enough to diagnose anaemia. This means some women may begin to feel increasingly tired even before iron deficiency is formally diagnosed.
When Iron Supplements May Be Needed
Dietary strategies can support iron intake, but food alone may not always meet the increased demands of pregnancy. If blood tests show low iron stores or iron-deficiency anaemia, your midwife or doctor may recommend iron supplements.
Iron status is typically assessed through blood tests that measure:
- haemoglobin
- ferritin (iron stores)
If supplementation is recommended, your healthcare provider can guide the appropriate dose and timing.
Simple Meal Ideas to Support Iron Intake
Putting these principles into practice can be simple.
Examples of iron-supportive meals include:
- Beef and spinach stir-fry with peppers
- Lentil and vegetable stew with tomatoes
- Chickpea salad with lemon dressing
- Fortified oats with berries
- Salmon with quinoa and broccoli
Combining iron-rich foods with vitamin-C-rich ingredients can help maximise absorption.
FAQs
What foods are highest in iron during pregnancy?
Some of the richest dietary sources include red meat, lentils, chickpeas, tofu, pumpkin seeds, spinach and iron-fortified cereals.
How can I increase iron naturally when pregnant?
Focus on including iron-rich foods regularly and combine them with vitamin-C-rich foods such as citrus fruits, peppers or berries to improve absorption.
Can vegetarians get enough iron during pregnancy?
Yes. Plant foods such as lentils, beans, tofu and seeds provide iron. Pairing these foods with vitamin C can help increase absorption.
What blocks iron absorption?
Tea, coffee, calcium and certain plant compounds can reduce iron absorption when consumed at the same time as iron-rich foods.
Do all pregnant women need iron supplements?
Not necessarily. Some women can meet their needs through diet, while others may require supplements if blood tests indicate low iron levels.
References
- Obianeli C. et al. (2024). Iron Deficiency Anaemia in Pregnancy: A Narrative Review. Diagnostics. Recent review summarising physiology, iron requirements in pregnancy, and maternal–fetal outcomes.
- National Academies of Sciences, Engineering and Medicine. Iron Nutrition During Pregnancy. Explains the physiological requirement of ~1,000 mg of additional iron across pregnancy.
- Churchill D. et al. (2025). Iron deficiency anaemia in pregnancy. BMC Pregnancy and Childbirth. Notes that iron-deficiency anaemia affects up to ~30% of pregnant women.
- UK clinical epidemiology data (e.g. British Journal of Haematology / UK clinical guidance summaries). Estimates that around one quarter of pregnant women in the UK experience anaemia during pregnancy.
