How Functional Medicine Practitioners Approach Eczema: Understanding Root Causes and the Gut-Skin Connection

How Functional Medicine Practitioners Approach Eczema: Understanding Root Causes and the Gut-Skin Connection

If you’ve ever been told that eczema “just happens” and that the best you can do is manage symptoms with topical creams, you’re not alone. Conventional dermatology often focuses on suppressing symptoms without exploring what may be driving the skin to react in the first place. But what if there’s more to the story?

A functional medicine approach takes a different path. Rather than viewing eczema as simply a skin problem, practitioners look at the whole picture — your genetics, your gut health, your hormones, your stress levels, and your environment. The goal isn’t just to calm the itch temporarily, but to identify what factors may be contributing to your skin’s distress and support your body’s natural ability to maintain healthy skin.

In this article, we’ll explore how functional medicine practitioners think about eczema, introduce you to the ATM model (Antecedents, Triggers, and Mediators), and share the emerging science on the gut-skin axis — including fascinating research on how gut bacteria may influence skin health.

Eczema by the Numbers: A Growing Challenge

Before diving into the functional medicine approach, let’s understand the scope of this condition. Eczema (atopic dermatitis) affects a staggering number of people:

These numbers suggest that something in our modern environment may be contributing to this epidemic of skin problems — and that’s exactly what functional medicine seeks to understand.

Conventional vs. Functional Medicine: Two Different Views

The Conventional Approach

If you’ve visited a dermatologist for eczema, you’ve probably experienced something like this: The doctor examines your skin, diagnoses eczema, and prescribes a topical corticosteroid or perhaps an immunomodulator. You might be told that eczema is chronic, that there’s no known cause, and that management is your best option.

This approach treats the body as a collection of separate systems — you see a dermatologist for skin, an endocrinologist for hormones, a gastroenterologist for digestion. Each specialist focuses on their domain.

The Functional Medicine Approach

Functional medicine (FM) practitioners take a whole-body view. Think of it like this: Conventional medicine might look at one branch of a tree, while FM examines the entire tree — roots, trunk, branches, leaves, and even the soil it grows in.

FM practitioners spend significant time taking detailed health histories to uncover what might be foundationally disrupted in the body. Research increasingly supports this integrative viewpoint. A 2020 paper by renowned researcher Dr. Alessio Fasano suggests that chronic inflammatory conditions share common pathways involving gut barrier function, genetics, and environmental triggers.

The ATM Model: A Framework for Understanding Eczema

Functional medicine uses the ATM model to systematically explore what may be contributing to any chronic condition, including eczema. ATM stands for:

Antecedents: Your Foundation

Antecedents are the predisposing factors that set the stage. These include:

  • Genetics and family history: If you have a family history of atopic conditions (eczema, asthma, allergies — sometimes called the “allergic triad”), research indicates you may have a higher likelihood of developing eczema
  • Early life factors: Infant feeding patterns, antibiotic exposure, and early microbial colonization can influence the developing immune system
  • Past illnesses and exposures: Previous infections, environmental exposures, and other health challenges

A key point about genetics: Having a family history doesn’t mean you’re destined to develop eczema. As Dr. Fasano’s research suggests, genes load the gun, but environmental factors pull the trigger.

Triggers: What Sets Things Off

Triggers are the factors that initiate or provoke symptoms. Common triggers identified in functional medicine practice include:

  • Infections: Bacterial, viral, or fungal exposures
  • Allergens: Environmental and food sensitivities
  • Toxins: Environmental chemicals and pollutants
  • Dietary factors: Specific foods that may provoke individual responses
  • Dysbiosis: Imbalances in the microbial communities in the gut and on the skin
  • Stress: Physical and emotional stressors

For many people, stress is one of the most significant triggers — either setting off symptoms or keeping them going.

Mediators: What Keeps It Going

Mediators are the factors that perpetuate the cycle. These often include:

  • Hormone imbalances: Particularly stress hormones and sex hormones
  • Nutrient deficiencies: From impaired absorption or increased demand
  • Compromised gut barrier function: Sometimes called “leaky gut“
  • Ongoing inflammation: Which can become self-perpetuating
  • Impaired detoxification: When the body struggles to clear metabolic byproducts

The ATM Formula: Antecedents + Triggers + Mediators = The factors that may contribute to symptoms

Understanding this framework helps explain why eczema can be so complex and individual — and why what works for one person may not work for another.

The Gut-Skin Axis: How Your Gut May Influence Your Skin

One of the most exciting areas of research relevant to eczema is the gut-skin axis — the bidirectional communication between your digestive system and your skin. This emerging field is changing how we think about skin conditions.

The Research Connection

Studies have found intriguing associations between gut health and eczema:

  • Research published in Allergy found that the severity of eczema in infants correlated inversely with gut microbiota diversity (r = -0.54, P = 0.002) and with the abundance of butyrate-producing bacteria (r = -0.52, P = 0.005)
  • The same study found that as microbiota diversity increased, butyrate-producing bacteria (specifically Coprococcus eutactus) increased, eczema severity scores decreased
  • A 2023 systematic review noted that increased intestinal permeability is more commonly found in people with gut dysbiosis, and this “leaky gut” state may influence skin conditions
  • People with eczema often show different patterns of gut bacteria, with fewer beneficial species like Bifidobacterium and Lactobacillus

Butyrate: A Key Player

One of the most compelling connections involves butyrate, a short-chain fatty acid produced by beneficial gut bacteria when they ferment fiber:

This research suggests that supporting gut health and maintaining a diverse microbiome may be one piece of the puzzle for those dealing with skin challenges.

Leaky Gut and Skin: The Connection

The concept of intestinal permeability (sometimes called “leaky gut”) has been the subject of significant research. Dr. Alessio Fasano’s groundbreaking 2012 paper proposed that increased intestinal permeability may be a key factor in the development of autoimmune and inflammatory conditions.

Here’s how it may relate to skin health:

  1. Barrier breakdown: When the intestinal barrier becomes more permeable, particles that would normally stay in the gut may enter the bloodstream
  2. Immune activation: These particles can trigger immune responses
  3. Systemic effects: This immune activation may manifest in various parts of the body — including the skin

The National Eczema Association has noted that while research is still evolving, the concept of leaky gut is being increasingly explored in relation to atopic dermatitis.

This connection underscores why functional medicine practitioners often look at gut health as a starting point, even when the primary complaint is skin-related.

Supporting the Body: A Functional Approach

If you’re working with a functional medicine practitioner on eczema, the approach typically involves identifying your unique ATMs and then developing strategies to address them. Here are some common focus areas:

Dietary Considerations

Many people find that certain foods seem to affect their skin. Common approaches include:

  • Elimination protocols: Temporarily removing potentially problematic foods to see if symptoms improve, then carefully reintroducing them
  • Anti-inflammatory eating: Focusing on whole foods, vegetables, healthy fats, and reducing processed foods
  • Gut-supportive foods: Including fiber-rich foods that feed beneficial bacteria, fermented foods (if tolerated), and bone broth

Gut Support Strategies

Because of the gut-skin connection, supporting digestive health is often a priority:

  • Identifying and addressing dysbiosis: Sometimes through functional testing
  • Supporting gut barrier function: Through diet and targeted support
  • Some people choose to supplement with L-glutamine, which research suggests may help support intestinal barrier integrity
  • Probiotics: While research is still evolving, some studies suggest certain probiotic strains may support skin health. A meta-analysis of randomized controlled trials found that probiotics showed potential benefits for children with atopic dermatitis
  • Butyrate support: Some practitioners recommend supporting butyrate levels through fiber-rich diets or direct supplementation with tributyrin (a form of butyrate)

Stress Management

Given that stress is often a significant trigger, addressing stress is typically part of a comprehensive approach:

  • Sleep optimization
  • Stress-reduction techniques (meditation, breathing exercises, gentle movement)
  • Identifying and addressing sources of chronic stress

Working with Practitioners

The functional medicine approach works best with the guidance of qualified practitioners who can:

  • Take a detailed health history
  • Order appropriate functional testing if needed
  • Create an individualized protocol
  • Monitor progress and adjust as needed

The Healthy Gut Leaky Gut Masterclass provides education on the multi-layered approach to supporting gut health that practitioners often recommend.

A Personal Note on the Complexity of Eczema

Many functional medicine practitioners who work with eczema patients understand the condition personally. The ATM model isn’t just theoretical — it’s a practical framework that accounts for the reality that eczema is complex and individual.

One practitioner might find that their eczema flares are related to hormonal shifts and dietary choices. Another might discover that stress and early-life antibiotic exposure play larger roles. The point isn’t that there’s one answer for everyone — it’s that there ARE factors worth exploring beyond “it’s just eczema.”

If you’ve been told there’s nothing to do but use creams indefinitely, know that many people have found value in exploring the deeper questions: What’s triggering MY eczema? What’s keeping MY cycle going? What can I do to support my body’s natural processes?

Frequently Asked Questions

Is eczema an autoimmune condition?

The understanding of eczema’s classification has evolved. Recent research suggests that eczema involves immune dysregulation and shares characteristics with autoimmune conditions. Dr. Fasano’s research framework suggests that conditions involving immune activation, genetic susceptibility, and intestinal permeability may share common pathways. However, eczema is technically classified as an “atopic” condition rather than a classic autoimmune disease. The distinction may matter less than understanding that immune system balance plays a significant role.

Can changing my diet really help my skin?

Individual responses vary significantly. Studies have found that some people with eczema — particularly children — show improvement when certain foods are eliminated. However, this doesn’t mean everyone needs to follow a restrictive diet. Working with a practitioner to identify YOUR potential triggers through systematic elimination and reintroduction is typically more effective than following a generic “eczema diet.”

What is the gut-skin axis?

The gut-skin axis refers to the bidirectional communication between the gastrointestinal tract and the skin. Your gut microbiome produces metabolites (like short-chain fatty acids, including butyrate), influences immune function, and affects systemic inflammation — all of which can influence skin health. Research published in 2023 describes how this axis may be relevant to various inflammatory skin conditions.

How long does a functional medicine approach take to show results?

This varies widely depending on individual factors, the severity of the condition, and how many contributing factors are involved. Some people notice improvements within weeks of making changes; others may need months of consistent effort. The goal is sustainable improvement rather than quick fixes. Many practitioners recommend committing to an approach for at least 3-6 months before evaluating results.

Should I stop my prescribed medications?

Never stop prescribed medications without discussing it with your prescribing physician. A functional medicine approach can often work alongside conventional treatments. As underlying factors are addressed, some people find they need less medication over time — but this should always be done under medical supervision.

What’s the connection between butyrate and eczema?

Butyrate is a short-chain fatty acid produced when gut bacteria ferment fiber. Research has found that infants with more severe eczema tend to have lower levels of butyrate-producing bacteria in their guts. Butyrate supports gut barrier function, helps regulate immune responses, and may have anti-inflammatory effects. Supporting butyrate production through fiber intake or supplementation is one strategy some practitioners explore.

Key Takeaways

  • Eczema affects millions — approximately 31.6 million Americans and over 200 million people globally, with rates increasing in industrialized nations
  • Functional medicine views eczema as a whole-body issue that may involve gut health, immune function, hormones, stress, and environmental factors — not just a skin problem
  • The ATM model (Antecedents, Triggers, Mediators) provides a systematic framework for identifying what may be contributing to individual symptoms
  • The gut-skin axis is real — emerging research shows meaningful connections between gut bacteria (especially butyrate-producing bacteria), intestinal barrier function, and skin health
  • Addressing root factors through diet, gut support, stress management, and working with qualified practitioners may offer additional options for those seeking to support their skin health naturally
  • Individual approaches matter — what works for one person may not work for another, which is why personalized assessment is valuable

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