14/08/2026
IRON: HOW MUCH DO WE ACTUALLY NEED? š©ø
Iron is essential for oxygen transport, energy production, brain function and growth.
But when it comes to iron, more isnāt necessarily better.
Our requirements change considerably throughout life:
š¶ 7ā12 months: 11 mg/day
š§ 1ā3 years: 9 mg/day
š§ 4ā8 years: 10 mg/day
š§ 9ā13 years: 8 mg/day
š¦ Adolescent males: 11 mg/day
šØ Adult males: 8 mg/day
And then we see a significant difference for women.
𩸠Women aged 19ā50: 18 mg/day
Why?
Because menstruation means regular blood, and therefore iron losses.
During pregnancy, requirements increase to 27 mg/day, because blood volume expands substantially (by a whopping 30%-50%) and additional iron is required for increased red blood cell production, the placenta and the developing babyās brain.
But hereās the important part:
Itās not just about how much iron you eat. Itās also about how much you absorb.
š Vitamin C can enhance absorption of non-haem iron.
Whereas calciumš„, tannins āļø, polyphenols and phytates can inhibit iron absorption under certain circumstances.
And this can have real-world implications.
A recent ABC News report highlighted concerns around excessive cowās milk consumption and iron deficiency in young children. Large quantities of cowās milk can displace iron-rich foods and also interfere with iron absorption, contributing to iron-deficiency anaemia.
So, yes - what you eat alongside your iron matters.
But thereās another side to this conversation that we donāt talk about enoughā¦
TOO LITTLE IS A PROBLEM. TOO MUCH CAN BE TOO.
Iron deficiency is the most common nutritional deficiency worldwide.
But iron overload can also be harmful.
The body has limited pathways for removing excess iron, meaning it can accumulate in tissues. This is particularly important in conditions such as haemochromatosis, where the body absorbs excessive amounts of iron.
Over time, iron accumulation can damage organs including the liver, heart and pancreas.
And very high doses of iron can cause acute toxicity, particularly in children.
Which is why I donāt recommend:
āIām tired ā I must be low in iron ā Iāll take an iron supplement.ā
Symptoms alone canāt tell us whether your iron status is low, adequate or excessive.
š¬ Test before you supplement.
And if youāre already supplementing but your iron levels arenāt improving, donāt simply keep increasing the dose.
Itās worth asking WHY.
Are you getting enough dietary iron ā
Are you absorbing itā
Are there ongoing blood lossesā
Is inflammation affecting your resultsā
Are you taking iron alongside something that inhibits absorptionā
Are you tolerating the form of iron youāre takingā
Because some commonly used iron supplements can have significant gastrointestinal side effects, including constipation.
Iron is essential.
But the goal isnāt to have more iron.
Itās to have the right amount, in the right place, at the right time.
So if your iron isnāt responding to interventionā¦
donāt just take more. Dig a little deeper. š