Every second blood report I see today has low ferritin, low iron, low haemoglobin or low vitamin B12. Most people are told exactly the same thing—“Take an iron supplement.”
They feel better for a few months, stop the tablets, and before long they’re iron deficient again.
The problem is that iron deficiency is rarely just about not eating enough iron. If you don’t understand why you’re deficient, you’ll keep treating the blood report instead of fixing the root cause.
Iron Deficiency and Anaemia Are Not the Same
The first thing to understand is that iron deficiency and anaemia are not the same thing.
Iron deficiency begins when your body’s iron stores start reducing. Ferritin, which reflects your iron stores, drops first. As iron stores continue to fall, transferrin saturation changes because less iron is available for transport.
Eventually, haemoglobin starts dropping, and that’s when you’re diagnosed with iron deficiency anaemia. By this stage, your body has often been struggling for months or even years.
The Early Symptoms of Iron Deficiency
Long before anaemia develops, your body is already trying to tell you something.
Fatigue, brain fog, poor concentration, headaches, dizziness, hair fall, reduced exercise tolerance, breathlessness while climbing stairs, cold hands and feet, palpitations and restless legs are all common symptoms.
Most people call this “normal tiredness” when, in reality, it’s often the earliest sign that your tissues aren’t receiving oxygen efficiently.
The Five Steps of Iron Metabolism
So why does iron deficiency happen?
Most people immediately think it’s because they’re not eating enough iron. That is certainly one reason, but it’s only one piece of the puzzle.
Iron metabolism has five important steps—intake, digestion, absorption, utilisation and cofactors. If any one of these steps is compromised, iron deficiency can develop.
Step One: Iron Intake
For healthy iron stores, your meals should regularly include green leafy vegetables, pulses and legumes, nuts and seeds, adequate protein and vitamin C-rich foods.
If you’re a non-vegetarian, include eggs, fish and meat regularly. But remember, simply eating non-vegetarian food does not guarantee healthy iron stores.
I see plenty of non-vegetarians with iron deficiency because food quality, frequency, digestion, inflammation, gut health and overall metabolic health determine how much iron your body is actually able to use.
One of the biggest problems today is that we’re overfed but undernourished. We eat enough calories but very little real nutrition.
We’ve become obsessed with high-protein diets, low-carb diets and the latest superfood, while forgetting that good health is built on a consistently nutrient-dense plate, not one magical food or drink.
Step Two: Digestion
The next step is digestion.
Eating iron isn’t enough if your body cannot digest it properly. Iron digestion begins in the stomach, where stomach acid converts ferric iron (Fe³⁺) into ferrous iron (Fe²⁺), the form that is much easier to absorb.
When stomach acid is low, this conversion becomes less efficient, reducing the amount of absorbable iron reaching the intestine.
This is one reason I worry about the long-term use of antacids. While they have an important role in certain medical conditions, they are often continued for months without addressing the reason symptoms developed in the first place.
Chronic stress, poor sleep, eating too quickly, irregular meal timings and a sedentary lifestyle can all reduce digestive efficiency.
Poor digestion doesn’t just affect iron—it also affects protein, vitamin B12, magnesium, calcium, zinc and copper, all of which are important for healthy blood production.
Step Three: Iron Absorption and Gut Health
Once iron is digested, your gut has to absorb it.
Iron is absorbed primarily in the small intestine, so the health of your gut lining and your gut microbiome becomes extremely important.
If your gut is unhealthy, absorption begins to fail. Persistent bloating, constipation, loose stools, excessive gas, undigested food in the stool, food intolerances and feeling tired after meals are not normal.
They may be signs that your gut is struggling to absorb nutrients efficiently.
Years of ultra-processed foods, repeated antibiotic use, alcohol, poor sleep, chronic stress, low fibre intake and irregular eating patterns gradually damage the gut environment.
If your gut cannot absorb nutrients properly, taking more supplements without improving gut health often becomes a temporary solution.
Step Four: Iron Utilisation and Hepcidin
Now let’s say you’re eating enough iron and your gut is absorbing it. Can you still be iron deficient?
Yes.
Because the next step is utilisation, and this is where your liver controls the game.
Your liver produces a hormone called hepcidin, which regulates both iron absorption from the intestine and the release of stored iron into the bloodstream.
Whenever inflammation increases, hepcidin also increases. Chronic stress, insulin resistance, fatty liver disease, infections, gut dysbiosis and diets rich in ultra-processed foods all increase inflammation.
As hepcidin rises, iron absorption falls and stored iron remains locked away. This means you may have iron in your body, but it isn’t available where it’s actually needed.
That’s why improving iron availability is just as important as improving iron intake.
Step Five: The Cofactors Iron Needs
The last piece of the puzzle is cofactors.
Iron never works alone. Vitamin B12, folate, vitamin D, vitamin A, magnesium, copper, adequate protein and a healthy gut all support iron metabolism.
These nutrients influence red blood cell production, iron transport, digestion, absorption and utilisation.
Correcting iron deficiency while ignoring these nutrients is like trying to build a house with only bricks and no workers.
Why Women Are Particularly Vulnerable
Women are particularly vulnerable because we lose blood every month.
An average menstrual cycle results in a blood loss of about 30–40 mL, with every millilitre containing approximately 0.4–0.5 mg of iron.
The recommended dietary allowance is about 8 mg of iron per day for men and 18–21 mg per day for women.
These recommendations apply to healthy individuals. If you already have iron deficiency or experience heavy menstrual bleeding, your requirements are likely to be higher.
Everyday Habits That Reduce Iron Absorption
There are also simple habits that quietly reduce iron absorption every single day.
Drinking tea or coffee with meals, frequent alcohol intake, smoking, long-term antacid use, crash dieting, chronic under-eating and diets high in ultra-processed foods all interfere with iron metabolism either by reducing absorption or increasing inflammation.
Chronic stress adds another layer by increasing the body’s demand for nutrients such as magnesium, B vitamins and antioxidants, while a low-fibre diet weakens gut health and the microbiome that support nutrient absorption.
Movement Supports Healthy Blood Production
Finally, don’t underestimate the role of movement.
Exercise isn’t just for weight loss or muscle gain. When you move regularly, your muscles demand more oxygen.
Your body adapts by improving circulation, insulin sensitivity, mitochondrial function, blood flow and oxygen utilisation. With adequate nutrition, it also supports healthy red blood cell production.
Your body always adapts to what you repeatedly ask of it.
Treat the Root Cause, Not Just the Blood Report
Iron deficiency isn’t caused by one mistake, and it won’t be fixed by one supplement.
It’s usually the result of multiple systems slowly breaking down— poor nutrition, poor digestion, an unhealthy gut, chronic inflammation, inadequate movement, poor sleep and unmanaged stress.
If you only replace iron, you’ll continue treating the deficiency. But if you improve your lifestyle, support your gut, reduce inflammation and build a nutrient-rich diet, you’re treating the reason the deficiency developed in the first place.
Build Long-Term Health
That’s the difference between temporarily correcting a blood report and building long-term health.