It’s often the small things that people start to notice first.

A friend once mentioned, almost in passing, that her hair had been thinning. Not dramatically, just enough to feel different in her hands. Her nails had become brittle, her skin slower to heal, and she seemed to pick up every cold that went around.

She had already tried “boosting her immune system”. Supplements, smoothies, and more vegetables. Still, nothing really shifted.

What no one had explored with her was this:

What if her body wasn’t lacking nutrients, but struggling to absorb and use them properly?

And more specifically…
What if her gut was at the root of it?

Because, when we look more closely, symptoms like these often point toward deficiencies in two powerful trace minerals: zinc and selenium, both deeply connected to gut health.

Why Zinc and Selenium Matter More Than You Think

Zinc and selenium are needed in small amounts, but their impact on the body is profound.

Zinc plays a role in:

• Immune function
• Skin healing and repair
• Hormone balance
• Taste and smell
• Fertility
• Digestive enzyme production

Selenium supports:

• Thyroid function
• Antioxidant defence
• Immune resilience
• Detoxification pathways
• Protection against oxidative stress

Together, they help regulate inflammation, protect cells, and support overall vitality.

And yet, deficiencies in both are increasingly common.

Where Do We Get Zinc and Selenium?

In traditional nutrient-dense diets, these minerals were readily available:

Zinc-rich foods

• Red meat and lamb
• Oysters and shellfish
• Liver and organ meats
• Egg yolks
• Raw dairy

Selenium-rich foods

• Seafood (especially fish and shellfish)
• Organ meats
• Pastured eggs
• Meat from animals raised on mineral-rich soil

These foods were not only nutrient-dense, but they were also consumed in a way that supported digestion and absorption.

The Gut’s Role in Mineral Absorption

Zinc and selenium are absorbed primarily in the small intestine, and this process depends on:

• A healthy gut lining
• Balanced gut bacteria
• Proper digestive secretions
• Low inflammation
• Functional transport systems

When the gut is healthy, these minerals are absorbed efficiently and used effectively.

When the gut is imbalanced, things begin to change.

What Is Gut Dysbiosis?

Gut dysbiosis refers to an imbalance between beneficial and harmful microbes in the digestive system.

It can develop from:

• Antibiotics
• Chronic stress
• Diets high in refined foods
• Sugar and processed oils
• Infections
• Poor digestion over time

While dysbiosis often shows up as bloating or discomfort, its deeper impact lies in how it disrupts nutrient absorption.

How Dysbiosis Affects Zinc and Selenium Levels

1. Damage to the Gut Lining Reduces Absorption

The intestinal lining acts as a gateway. When it becomes inflamed or damaged, mineral absorption decreases.

Zinc, in particular, is sensitive to gut integrity. Even mild inflammation can reduce how much is taken up by the body.

2. Increased Demand During Inflammation

Dysbiosis creates a state of chronic, low-grade inflammation.

This increases the body’s need for both zinc and selenium because they are used to:

• Regulate immune responses
• Repair tissues
• Neutralise oxidative stress

So not only is absorption reduced, but demand is increased.

3. Impaired Digestive Function

Zinc is required for the production of digestive enzymes and stomach acid. When zinc levels drop, digestion weakens, which in turn further reduces mineral absorption.

This creates a cycle:

• Poor gut → low zinc
• Low zinc → poorer digestion
• Poor digestion → further deficiency

4. Disruption of the Microbiome

Beneficial bacteria help maintain a healthy gut environment for nutrient absorption.

When dysbiosis reduces these bacteria:

• The intestinal environment becomes less supportive
• Mineral transport becomes less efficient
• Inflammation increases

5. Soil, Food, and Modern Diets

Modern food systems also play a role. Even before digestion, mineral levels in food may already be lower due to depleted soils.

This makes efficient absorption even more important and more vulnerable when gut health is compromised.

Signs of Zinc and Selenium Deficiency

These deficiencies often show up in subtle ways at first:

Zinc deficiency signs

• Poor wound healing
• Hair thinning
• Acne or skin issues
• Reduced sense of taste or smell
• Frequent infections
• Low appetite

Selenium deficiency signs

• Fatigue
• Thyroid imbalances
• Weakened immune function
• Brain fog
• Muscle weakness

Because these symptoms are non-specific, they are often overlooked or misattributed.

Why Supplements Don’t Always Solve the Problem

It can be tempting to simply take a supplement.

But if the gut is inflamed or imbalanced:

• Absorption may still be poor
• Supplements may irritate the gut
• The underlying issue remains unaddressed

This is why some people take supplements for months without seeing meaningful improvements.

Traditional Diets: Supporting Both Intake and Absorption

Traditional cultures didn’t just consume nutrient-rich foods; they also supported the body’s ability to absorb them.

They included:

• Fermented foods daily
• Slow-cooked, mineral-rich meals
• Organ meats regularly
• Balanced meals with fats, proteins, and minerals
• Minimal processed foods

This combination supported both the microbiome and digestive strength.

Supporting Zinc and Selenium Through Gut Healing

A gentle, traditional approach can restore balance.

Nourish the gut lining

• Bone broth (250–500 ml / 1–2 cups daily)
• Slow-cooked meats
• Gelatine-rich dishes

Rebuild beneficial bacteria

• Sauerkraut
• Kefir
• Yoghurt
• Beet kvass
• Fermented vegetables

Include mineral-rich foods

• Shellfish (especially oysters)
• Red meat and lamb
• Liver once weekly (75–100 g / 2½–3½ oz)
• Eggs

Reduce gut disruptors

• Refined sugar
• Ultra-processed foods
• Industrial seed oils

As the gut begins to heal, the body becomes more efficient at absorbing and utilising these essential minerals.

A Quiet Root Cause

Zinc and selenium deficiencies are often treated as isolated problems.

But in many cases, they are signals, signs that the body is struggling to absorb and regulate nutrients properly.

And more often than not, that struggle begins in the gut.

When we shift the focus from simply “adding nutrients” to restoring digestion and microbial balance, the body often finds its way back to equilibrium.

References

Research increasingly highlights the relationship between gut health, trace mineral absorption, and immune and metabolic function. Studies show that intestinal inflammation and dysbiosis impair zinc absorption and increase losses, while selenium status is closely linked to gut microbiota composition and oxidative stress regulation. Zinc also plays a direct role in maintaining gut barrier integrity, creating a two-way relationship between gut health and mineral status. The following scientific publications provide further insight into these connections:

• Prasad, A. S. (2013). Discovery of human zinc deficiency: Its impact on human health and disease. Advances in Nutrition.
• King, J. C. (2011). Zinc: An essential but elusive nutrient. American Journal of Clinical Nutrition.
• Foster, M., & Samman, S. (2012). Zinc and regulation of inflammatory cytokines: Implications for cardiometabolic disease. Nutrients.
• Rayman, M. P. (2012). Selenium and human health. The Lancet.
• Tinggi, U. (2008). Selenium: Its role as antioxidant in human health. Environmental Health and Preventive Medicine.

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Disclaimer: The content of this blog post is for informational purposes only and is not intended as medical advice. While I strive to provide accurate, well-researched, and up-to-date information, I am not a licensed medical professional. The insights shared here are based on personal research and experience. I encourage you to conduct your own research and consult a qualified healthcare provider before making any health-related decisions. Your well-being is important, and any actions taken based on the information in this blog are solely at your own discretion and risk.