Hereditary Haemochromatosis:

What It Is, Why It Matters, and How Nutrition Can Help

Hereditary haemochromatosis (HH) is often described as a condition where the body absorbs too much iron. While this is true, research now suggests that excess iron may affect more than just iron stores, including gut health, inflammation, and overall wellbeing.

Understanding this can help explain why some people with HH continue to experience symptoms even when their iron levels are being treated.

What is hereditary haemochromatosis?

Hereditary haemochromatosis is a genetic condition that affects how the body regulates iron absorption. It is most common in people of Northern European ancestry, with UK estimates suggesting up to 1 in 200 people carry the condition (Bomford, 2002; Haemochromatosis UK, 2024).

In HH, changes in the HFE gene alter signalling for the hormone hepcidin, which normally regulates how much iron is absorbed. As a result, the body absorbs more iron than it needs, leading to raised markers such as transferrin saturation and ferritin (EASL, 2022).

Over time, iron can build up in organs including the liver, pancreas, joints and the digestive tract.

Why does excess iron matter?

Iron is essential for life, but too much iron can be harmful.

When iron levels are high:

• Excess iron promotes oxidative stress, which can damage tissues

• It can drive low-grade inflammation

• It may disrupt the balance of bacteria in the gut and mouth

This is important because the gut microbiome plays a key role in digestion, immunity, and metabolic health.

How hereditary haemochromatosis may affect gut and oral health

Research suggests that excess iron creates an environment that favours certain bacteria over others.

In the gut

• Iron can encourage the growth of opportunistic and potentially harmful bacteria (Sivaprakasam et al., 2020)

• Beneficial bacteria may struggle to compete in iron-rich environments (Dentand et al., 2024)

• This imbalance (known as dysbiosis) may contribute to digestive symptoms and inflammation (Celis et al., 2023; Sivaprakasam et al., 2020)

In the mouth

• Higher iron levels have been linked to changes in the oral microbiome

• Increased levels of bacteria associated with gum disease have been observed in people with high iron markers (Boyer et al., 2018; Boyer et al., 2019)

• Oral bacteria can influence gut health via the oral–gut axis

Together, these changes may help explain symptoms such as fatigue, gut discomfort, inflammation, and periodontal issues sometimes reported by people with HH.

How nutrition can help support hereditary haemochromatosis

Medical treatment, such as venesection, can help modulate hereditary haemochromatosis (HH). However, nutrition and lifestyle support can play an important complementary role, helping to moderate iron exposure, support gut and oral health, and reduce inflammation.

Nutritional support is about modulating absorption and supporting resilience.

1. Supporting appropriate iron intake

People with HH absorb iron more efficiently than required due to impaired hepcidin signalling (Ganz & Nemeth, 2011).

Nutrition considerations may include:

• Avoiding iron-containing supplements, unless medically indicated

• Being cautious with iron-fortified foods, which can significantly increase iron intake without obvious awareness

• Reviewing multivitamins and other supplements to ensure they do not contain iron

• Understanding what type and how much iron each food contains

This approach aligns with clinical guidance that unnecessary dietary iron can contribute to iron loading in HH (EASL, 2022; Adams, 2015).

2. Modulating iron absorption through diet

Iron absorption is strongly influenced by other dietary components.

Supportive strategies may include:

• Including polyphenol-rich foods (e.g. berries, tea, herbs, spices), which have been shown to inhibit non-heme iron absorption (Hurrell et al., 1999; Hallberg & Hulthén, 2000)

• Consuming calcium-rich foods with meals, as calcium can reduce both heme and non-heme iron absorption (Hallberg et al., 1991)

• Being mindful that vitamin C enhances iron absorption, particularly from plant foods (Cook et al., 1991)

3. Supporting gut microbiome balance

Only around 15% of dietary iron is absorbed in the small intestine; the remainder enters the colon, where it influences microbial composition (Ohkawara et al., 1964).

Research suggests that excess iron:

• Encourages the growth of opportunistic and pathogenic bacteria

• Suppresses some beneficial commensal species

• May contribute to gut dysbiosis and inflammation (Celis et al., 2023; Sivaprakasam et al., 2020)

Nutrition strategies may therefore include:

• A diverse, fibre-rich diet to support beneficial bacteria

• A wide variety of plant foods to enhance microbial diversity

• Supporting regular bowel movements, as iron accumulation may worsen digestive discomfort

At present, evidence for probiotic use in HH is limited, so recommendations should be individualised and cautious.

4. Supporting oral health

Iron status has also been linked to changes in the oral microbiome, with higher transferrin saturation associated with increased periodontal pathogens (Boyer et al., 2018; Boyer et al., 2019).

Supportive strategies include:

• Maintaining good oral hygiene

• Regular dental check-ups

• Reducing dietary patterns that promote oral dysbiosis (e.g. frequent sugar exposure)

Oral health is relevant because oral bacteria can influence gut microbiota through the oral–gut axis (Bajaj et al., 2018; Olsen & Yamazaki, 2019).

5. Reducing inflammation and oxidative stress

Excess iron promotes the formation of reactive oxygen species (ROS), contributing to oxidative stress, lipid peroxidation, and inflammation (Brissot et al., 2012).

Nutrition support may therefore focus on:

• An anti-inflammatory dietary pattern rich in vegetables, fruits, and whole foods

• Adequate intake of nutrients involved in antioxidant defence (e.g. selenium, zinc, magnesium)

• Supporting liver health and moderating alcohol intake, which can exacerbate iron-related liver stress (Adams, 2015)

6. Considering the wider picture

The clinical expression of HH is influenced by more than genetics alone. Factors such as:

• Alcohol intake

• Metabolic health

• Inflammation

• Gut integrity

can all affect symptom severity and long-term outcomes (Adams, 2015; Barton et al., 2018).

A personalised, whole-person approach is therefore essential.

Important note on individualisation

Every person with hereditary haemochromatosis is different.
Nutrition support should always be:

• Individualised

• Reviewed alongside iron markers

• Integrated with medical care

Nutritional therapy does not replace medical treatment but may meaningfully support overall wellbeing when used appropriately.

When to seek medical advice

While nutrition and lifestyle support can play an important role in managing hereditary haemochromatosis, medical oversight is essential.

You should seek medical advice if:

• You have persistent fatigue, joint pain, abdominal discomfort, or unexplained symptoms

• Blood tests show raised transferrin saturation or ferritin, or these markers are increasing over time

• There is a family history of haemochromatosis, even if you feel well

• You experience symptoms such as:

  • Ongoing digestive issues

  • Changes in blood sugar control

  • Liver-related symptoms (e.g. abnormal liver enzymes, pain under the right rib)

  • Heart palpitations or unexplained breathlessness

• You are unsure whether iron supplements, multivitamins, or fortified foods are appropriate for you

Medical assessment may include blood tests, genetic testing, imaging, or referral to a specialist. Early diagnosis and treatment can significantly reduce the risk of long-term complications.

Important: Nutritional therapy does not replace medical treatment for haemochromatosis. Interventions such as venesection must always be guided by a qualified medical professional.

Key takeaway

Hereditary haemochromatosis is more than just “too much iron.”
Excess iron may influence gut and oral health, inflammation, and overall resilience, helping to explain why symptoms can persist even with treatment.

A joined-up approach: combining medical management with personalised nutrition and gut support, may offer the best outcomes for long-term wellbeing.

If you would like support managing Haemochromatosis book in for a discovery call and let’s have a chat.

References:

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Barton, J. C., Edwards, C. Q., & Acton, R. T. (2018). HFE gene: Structure, function, mutations, and associated iron abnormalities. Gene, 674, 143–152. https://doi.org/10.1016/j.gene.2018.06.074

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