11/06/2026
IRON IS NOT JUST ABOUT ANAEMIA
If you are not addressing Iron first and foremost you are making a huge mistake with trying to address your health
One of the biggest mistakes in health is treating iron as though it only matters when haemoglobin falls below range.
Iron is not simply a blood marker.
Iron sits near the top of human physiology.
Every cell depends on it.
When iron becomes depleted, the body does not simply develop anaemia. It begins a cascade of compensation that can affect oxygen delivery, energy production, digestion, nutrient absorption, immunity, hormones, neurological function, cardiovascular function and ultimately the bodyโs ability to maintain itself.
The problem is that this process often develops slowly over years, meaning many people adapt to worsening physiology without realising what is happening.
The First Stage: Loss of Iron Stores
Ferritin represents stored iron.
As ferritin falls, the body attempts to preserve normal haemoglobin for as long as possible.
This is why people can be told:
โYour haemoglobin is normal.โ
while their iron stores are becoming increasingly depleted.
The body is essentially living off its savings account.
During this stage people may develop:
โข Fatigue
โข Exercise intolerance
โข Breathlessness
โข Hair loss
โข Cold hands and feet
โข Anxiety symptoms
โข Poor concentration
โข Headaches
โข Restless legs
โข Reduced stress tolerance
Long before anaemia appears.
Why Iron Matters So Much
Iron is required for:
โข Haemoglobin production
โข Oxygen transport
โข Mitochondrial energy production
โข Stomach acid production
โข Neurotransmitter synthesis
โข Immune function
โข Thyroid hormone utilisation
โข Muscle function
โข DNA synthesis
โข Tissue repair
This means iron deficiency affects far more than red blood cells.
Oxygen Delivery Begins To Fail
Iron is the central component of haemoglobin.
Haemoglobin carries oxygen from the lungs to every tissue in the body.
When iron becomes insufficient:
โข Haemoglobin production falls
โข Oxygen delivery falls
โข Cellular energy production falls
The body then enters compensation mode.
Why Heart Rate Increases
The heartโs job is to deliver oxygen.
If each red blood cell is carrying less oxygen, the body has only one option:
Pump faster.
This is why iron deficiency commonly causes:
โข Elevated resting heart rate
โข Palpitations
โข Tachycardia
โข Exercise intolerance
The body is attempting to maintain oxygen delivery despite reduced oxygen carrying capacity.
The heart is working harder because the blood is carrying less.
Why Blood Pressure Can Become Unstable
Iron deficiency reduces oxygen availability to tissues.
When tissues detect inadequate oxygen delivery, the autonomic nervous system becomes activated.
This may contribute to:
โข Dizziness
โข Lightheadedness
โข Orthostatic intolerance
โข Blood pressure instability
โข POTS like symptoms
The nervous system is responding to reduced physiological capacity.
Iron and Mitochondria
This is often overlooked.
Iron is a critical component of the electron transport chain.
Without adequate iron:
โข ATP production falls
โข Cellular energy production falls
โข Muscle endurance falls
โข Recovery slows
The body may have sufficient calories but still struggle to generate energy efficiently.
Many people describe this as:
โI feel exhausted but my tests are normal.โ
Iron and the Thyroid
The thyroid cannot function optimally without iron.
Iron is required for thyroid peroxidase activity.
This enzyme helps produce thyroid hormones.
Low iron may contribute to:
โข Fatigue
โข Feeling cold
โข Hair loss
โข Poor metabolism
โข Reduced thyroid efficiency
Even when thyroid hormone levels appear acceptable.
Iron and the Gut
This is where things become particularly important.
Iron deficiency affects the gastrointestinal tract itself.
The cells lining the digestive tract turn over rapidly and require adequate oxygen and energy.
When iron deficiency becomes prolonged:
โข Gut tissue integrity may decline
โข Digestive function may decline
โข Nutrient absorption may decline
This creates a dangerous feedback loop.
Iron and Stomach Acid
Iron is required for healthy stomach function.
Prolonged deficiency is associated with reduced gastric acid production.
Lower stomach acid can lead to:
โข Poor protein digestion
โข Reduced mineral absorption
โข Reduced B12 release from food
โข Increased bacterial overgrowth risk
The consequences can extend far beyond iron itself.
The B12 and Folate Cascade
This is where many people become stuck.
Iron deficiency can impair the environment needed for nutrient absorption.
Over time this may contribute to:
โข B12 insufficiency
โข Folate insufficiency
โข Protein digestion problems
โข Broader nutrient deficiencies
Now the body is dealing with multiple deficiencies simultaneously.
Iron deficiency may have been the first domino.
Iron, B12 and Folate Work Together
The body cannot make healthy red blood cells without:
โข Iron
โข B12
โข Folate
Deficiency in one often exposes problems in another.
This is why some people partially improve with B12 but still struggle.
Others improve with iron but remain symptomatic because B12 or folate are limiting.
The entire system must work together.
Iron and the Nervous System
Iron is required for production of:
โข Dopamine
โข Serotonin
โข Norepinephrine
Low iron may contribute to:
โข Anxiety
โข Poor concentration
โข Low mood
โข Brain fog
โข Restless legs
โข Neurological symptoms
This is not simply psychological.
It is biochemical.
Iron and Mast Cells
Iron deficiency is increasingly being linked to mast cell instability.
Mast cells are highly metabolically active immune cells.
When iron becomes depleted:
โข Cellular stress increases
โข Oxidative stress increases
โข Histamine related symptoms may worsen
Many people with low iron report:
โข Histamine intolerance
โข Flushing
โข Food sensitivities
โข Increased reactivity
Iron may not be the only factor, but it can be a significant contributor.
Iron and Immunity
Immune cells require iron to function properly.
Prolonged deficiency can affect:
โข Immune signalling
โข Infection resistance
โข Tissue repair
The body begins prioritising survival over optimal function.
Then Inflammation Arrives
This is where things become even more complicated.
Chronic deficiency creates physiological stress.
Chronic illness creates inflammation.
Inflammation increases hepcidin.
Hepcidin is the hormone that controls iron movement.
When hepcidin rises:
โข Iron becomes trapped in storage
โข Iron absorption falls
โข Iron release from ferritin falls
This is called iron sequestration.
Now the body may contain iron but cannot access it efficiently.
The Iron Sequestration Trap
Once inflammation and iron deficiency begin feeding each other, people can become trapped in a cycle:
Low iron โ physiological stress โ inflammation
Inflammation โ increased hepcidin โ reduced iron availability
Reduced iron availability โ worsening deficiency
Worsening deficiency โ more physiological stress
The cycle repeats.
This is why simply looking at ferritin is often not enough.
The broader picture matters.
The Missing Message
Iron deficiency is not simply about being tired.
It is a whole body physiological problem.
It affects:
โข Oxygen delivery
โข Heart function
โข Blood pressure regulation
โข Mitochondrial energy production
โข Thyroid function
โข Digestion
โข Stomach acid
โข Nutrient absorption
โข B12 status
โข Folate status
โข Neurotransmitters
โข Mast cells
โข Immunity
And if ignored for long enough, it can contribute to a cascade of secondary dysfunction that becomes progressively harder to untangle.
The longer iron deficiency remains uncorrected, the more systems the body must compensate with.
Eventually the question is no longer:
โHow low is the iron?โ
The question becomes:
โHow many systems have been forced to compensate because the iron was low for so long?โ
Test. Identify. Correct. Reassess.
Because iron is rarely just an iron problem. It is often the first domino in a much larger biological cascade.
