Iron for children: what it does, where to find it and how to help it absorb

Iron comes up a lot in conversations about children's eating, often with a slightly worried tone. That makes sense. It's one of the nutrients most likely to run low in children who eat a narrow range of foods, and low iron can quietly affect energy, concentration and sleep. The good news is that there is a lot you can do with ordinary meals.

Why iron matters

Iron helps red blood cells carry oxygen around the body, and it is used in brain development and in making some of the chemical messengers the brain relies on. When iron stores run low, children can become tired, pale, irritable or less able to concentrate. Very low iron leads to iron deficiency anaemia, which a simple blood test can pick up (NHS).

Researchers have looked at whether children with ADHD are more likely to have low iron stores, and some studies suggest they might be. But the evidence is limited, and it doesn't show that iron treats ADHD. The sensible takeaway is simpler: make sure iron intake is adequate, as it should be for any child.

Two kinds of iron

Iron in food comes in two forms.

Haem iron is found in meat, poultry and fish. The body absorbs it quite easily. Red meat such as beef and lamb is the richest source, with chicken, turkey and oily fish contributing smaller amounts.

Non-haem iron is found in plant foods and eggs: beans, lentils, chickpeas, tofu, dark leafy greens, fortified breakfast cereals, oats, wholemeal bread, dried apricots and seeds. It is absorbed less efficiently, but in many families, and in most of the world's food traditions, it makes up most of the iron eaten. Lentil dal, black beans and rice, chickpea stews and fortified maize porridge are all real iron contributors.

What helps iron absorb

This is where meals can make a genuine difference.

Vitamin C alongside plant iron. Eating something rich in vitamin C in the same meal helps the body take up non-haem iron. That could be orange segments with fortified cereal, tomatoes in a bean stew, peppers with hummus, or strawberries after a lentil dish.

A little meat or fish with plant foods. Even a small amount of meat, chicken or fish in a meal improves the absorption of iron from the beans or vegetables alongside it. A mince and lentil bolognese works well for exactly this reason.

What gets in the way

Milk with iron-rich meals. Calcium competes with iron. Milk itself is valuable, but large amounts can crowd out iron, both by filling a child up and by reducing absorption. Very high milk intake in toddlers is a known cause of low iron. It can help to offer milk between meals rather than with them.

Tea. Compounds in tea reduce iron absorption. It's less common for children, but worth knowing.

Wholegrains and bran in large amounts. Phytates in wholegrains and pulses bind some iron. This isn't a reason to avoid them; soaking, sprouting and fermenting (as in sourdough) reduce the effect, and pairing with vitamin C helps.

What you can try tomorrow

• Breakfast: a fortified cereal or oat porridge with a small glass of orange juice or some kiwi on the side.
• Lunch: a wrap with hummus and sliced red pepper, or leftover chicken and rice.
• Dinner: beef or bean chilli with tomatoes; lentil soup with a squeeze of lemon; a tofu stir-fry with broccoli.
• Snacks: a few dried apricots, pumpkin seeds (if age-appropriate), or an egg.

If your child refuses most iron-rich foods

Start from what they already accept. Many selective eaters will eat a fortified cereal, often dry, and that alone can supply a good share of daily iron. Meatballs or burgers are often easier than pieces of meat because the texture is uniform. Blended lentils can disappear into a tomato pasta sauce if smooth sauces are accepted. Crunchy roasted chickpeas sometimes work for children who like crisp textures.

Why supplements should not be started casually

It's tempting to buy an iron supplement "just in case". Please check with a doctor first. Too much iron can be harmful, and iron supplements are a leading cause of accidental poisoning in young children, so they must be stored well out of reach (NIH). Iron supplements can also cause constipation and tummy upset. A blood test tells you whether there is actually a problem and how much, if any, supplementation is needed.

When to get professional advice

Talk to your GP or paediatrician if your child seems unusually tired, pale or breathless, has very pale skin inside the eyelids, craves non-food items like ice or soil, or if their diet contains very little meat, beans, fortified foods or greens. A dietitian can help you build iron into the foods your child already eats.

Related reading: iron-friendly meal combinations, why protein matters and our nutrition overview.