Low Iron Is Rarely ‘Just Low Iron’ — Here’s What Your Body Is Really Telling You

Iron deficiency is a MESSAGE from the body… not just a deficiency.

One of the biggest mistakes I see clinically is treating low iron like an isolated deficiency — without ever asking WHY the body cannot maintain healthy iron levels in the first place.

If you have been told your iron is low, handed a supplement, and sent on your way — yet you still feel exhausted, still have low ferritin, and are still not getting better — this post is for you.

Low iron is often a symptom of a bigger physiological picture. And unless those upstream drivers are identified and addressed, the cycle just continues.

Why Some Women Stay Iron Deficient Despite Doing Everything Right

Low iron can be connected to a wide range of underlying drivers:

• Low stomach acid
• Gut inflammation
• Gluten intolerance or coeliac disease
• Bile and liver dysfunction
• Chronic inflammation
• Dysbiosis (imbalance in gut bacteria)
• Heavy bleeding
• Nutrient deficiencies — including B12, folate, and copper

This is why some women eat plenty of red meat, supplement iron for years, still have low ferritin, and still feel utterly exhausted. The body may not be absorbing, transporting, or using iron properly. Let’s look at each of these drivers in detail.

1. Low Stomach Acid — One of the Biggest Root Causes

Iron requires adequate stomach acid to be properly absorbed. So if you are still iron deficient despite eating red meat and/or taking supplementation, your gut is likely part of the problem.

Signs low stomach acid may be affecting you:

• Bloating after meals
• Reflux or GERD
• Burping
• Constipation
• Heaviness after eating
• Undigested food in stool

Many people are prescribed acid-blocking medications for reflux — which can actually worsen iron absorption over time. This is a critical piece that is frequently missed.

2. Your Gut Lining May Be Blocking Absorption

Iron is absorbed mainly in the small intestine. If the gut lining is inflamed or damaged, absorption drops significantly — regardless of how much iron you eat or supplement.

Common causes of gut lining damage:

• Dysbiosis (imbalanced gut bacteria)
• SIBO (small intestinal bacterial overgrowth)
• Candida overgrowth
• Parasites
• pylori infection
• Elevated zonulin (leaky gut marker)
• Chronic inflammation

This is why ‘healthy eating’ alone doesn’t fix low iron — if your gut can’t absorb what you eat, it doesn’t matter how good your diet is.

3. Gluten Intolerance & Coeliac Disease Are Massive Contributors

One of the earliest signs of coeliac disease can actually be persistent low iron — even without any digestive symptoms. This surprises many people.

The reason? Gluten-driven inflammation damages the intestinal villi — the tiny finger-like projections in the small intestine where iron is absorbed. When those are damaged, iron absorption is severely compromised.

Clinical clues I look for:

• Fatigue
• Bloating
• Skin issues
• Mouth ulcers
• Constipation or diarrhoea
• Autoimmune patterns
• Low B12, low folate, and low iron appearing together

If you have never been tested for coeliac disease or gluten sensitivity, and your iron keeps dropping — it is absolutely worth investigating.

4. Chronic Inflammation Can Trap Iron in the Body

This is a huge missing piece — and one that is rarely discussed.

When inflammation is high, the liver increases production of a hormone called hepcidin. Hepcidin acts like a gatekeeper — it tells the body to hide iron away, reduce absorption, and lock iron in storage.

Meaning you can eat iron, supplement iron, and STILL feel iron deficient — because the body is actively preventing it from being used.

This pattern is common in:

• Gut inflammation
• Autoimmune conditions
• Chronic infections
• Mould exposure
• Metabolic inflammation

If inflammation is the driver, simply supplementing iron will never be enough. The inflammation must be addressed first.

5. Iron Does Not Work Alone — Co-Nutrient Deficiencies Matter

Low iron is frequently connected to deficiencies in other critical nutrients:

• Low B12
• Low folate
• Low copper
• Poor methylation
• Malabsorption

These nutrients are critical for:

• Red blood cell formation
• Oxygen transport
• Iron recycling
• Energy production

Sometimes the issue isn’t ‘not enough iron’… it’s that the body can’t USE it properly.

A comprehensive nutritional assessment should always look at these co-factors — not just ferritin and haemoglobin in isolation.

6. Your Liver & Bile Flow Matter More Than You’ve Been Told

The liver plays a central role in iron metabolism that is rarely talked about. It helps regulate:

• Iron storage
• Iron transport
• Inflammation levels
• Nutrient metabolism

Poor bile flow and liver overload — which are far more common than most people realise — can contribute to:

• Sluggish digestion
• Constipation
• Microbial overgrowth
• Poor nutrient absorption
• Increased inflammation

Clinically, I commonly see low iron presenting alongside hormonal imbalances, sluggish bowels, bloating, gluten intolerance, and gallbladder dysfunction. These are not coincidences — they share the same upstream drivers.

7. Hidden Blood Loss Must Always Be Considered

If iron keeps dropping despite good intake and supplementation, a critical question must be asked: Where is the iron going?

Hidden or ongoing blood loss is a significant but commonly overlooked driver of persistent iron deficiency, especially in women. This is particularly relevant with:

• Heavy periods
• Endometriosis
• Fibroids
• Adenomyosis
• Gastritis
• Ulcers
• Haemorrhoids
• Gut inflammation

If you are consistently losing iron faster than you can replace it, no amount of supplementation will fix the underlying problem.

8. Lactoferrin — A Smarter Way to Support Iron Levels

If you have been struggling with iron supplementation — whether due to poor absorption, digestive side effects, or iron that simply won’t stay up — lactoferrin may be worth exploring.

Lactoferrin is a naturally occurring glycoprotein found in breast milk and other secretions. It plays a key role in iron regulation and immune function, and is increasingly recognised as a highly effective, well-tolerated alternative or complement to conventional iron supplementation.

How lactoferrin supports iron status:

• Helps regulate iron absorption in the gut without causing oxidative stress
• Binds iron in a way that prevents it from feeding harmful gut bacteria
• Supports the gut lining integrity — directly addressing one of the key absorption barriers
• Has anti-inflammatory properties, which may help lower hepcidin levels and free up trapped iron
• Does not cause the constipation, nausea, or gut irritation commonly associated with standard iron supplements

Particularly beneficial for:

• People who have tried iron supplementation without success
• Those with gut inflammation, dysbiosis, or leaky gut
• Endurance athletes with training-induced gut stress and elevated hepcidin
• Anyone who experiences significant digestive side effects from standard iron supplements
• Women with chronic low ferritin who absorb iron poorly

Lactoferrin works WITH the body’s iron regulatory system — rather than simply flooding the system with more iron that the body may not be able to use.

It is not a replacement for identifying and addressing root causes — but it can be a valuable tool in a comprehensive strategy, particularly for those who struggle with conventional supplementation.

Why Iron Supplements Sometimes Don’t Work

These are the reasons why iron supplements sometimes don’t work — or why you constantly need to keep supplementing. Because the real issue may be:

• Poor absorption
• Unresolved gut inflammation
• Gluten intolerance
• Low stomach acid
• Dysbiosis
• Copper deficiency
• Liver dysfunction
• Chronic inflammation

The Bottom Line: Low Iron Is Rarely ‘Just Low Iron’

The body is always telling a deeper story. And until the root cause is addressed, many women stay stuck in a cycle of:

• Fatigue
• Hair loss
• Poor recovery
• Brain fog
• Low energy
• Dizziness
• Repeated supplementation — without real answers

Low iron is a message from the body. The question is: are you asking what it’s trying to say?

A whole-body, root-cause approach to iron deficiency looks at digestion, absorption, inflammation, co-nutrients, liver function, and blood loss — not just ferritin levels in isolation. And where appropriate, smarter supplementation strategies like lactoferrin can support the journey back to optimal iron status.

Work With Me

If you have been struggling with low iron, persistent fatigue, or poor recovery despite eating well and supplementing — it may be time to look deeper.

At Mad on Nutrition, I take a comprehensive, evidence-informed approach to women’s health and sports nutrition, helping you identify the real drivers behind your symptoms so you can finally feel your best.

Get in touch to find out how I can help.