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19-03-2026

Gut Microbiome and Psoriasis: From Skin to Gut

For many people, psoriasis begins as a skin symptom. Small lesions that gradually expand and begin to affect daily life. However, modern medicine shows that the course of the disease cannot be explained solely by the skin. Psoriasis is now considered a chronic, systemic, immune-mediated disorder. The inflammation observed on the skin reflects a broader immune system activation.

At this point, the gut comes into focus. The microbiome, meaning the collection of microorganisms living in the intestine, directly influences immune balance. When this balance is disrupted, mechanisms may be triggered that contribute to the onset or exacerbation of psoriasis. The concept of the gut–skin axis explains how a disturbance in the gut can manifest on the skin. This approach changes the way we understand the disease, while also opening new possibilities for prevention and intervention.

The Biology Behind the Gut–Psoriasis Connection

To understand the relationship between the gut and psoriasis, we need to examine how the immune system interacts with the microbiome. The gut is the body's largest immune organ. More than 70% of immune cells are located there. Gut bacteria are not merely passive “inhabitants”, but active regulators of immune responses. When the microbiome is balanced, it contributes to:

  • The production of anti-inflammatory metabolites, such as short-chain fatty acids
  • The maintenance of intestinal barrier integrity
  • The proper training of the immune system to avoid overreaction
     

However, when dysbiosis occurs, meaning an imbalance in microbial composition, problems begin to emerge. Dysbiosis can increase intestinal permeability. This allows microbial components, such as lipopolysaccharides, to enter the bloodstream and activate the immune system. The result of this process is the production of pro-inflammatory cytokines, such as:

  • IL-6
  • TNF-α
  • IL-17
     

These cytokines play a central role in the pathogenesis of psoriasis, promoting keratinocyte hyperproliferation and sustaining skin inflammation. Recent studies confirm that patients with psoriasis often present:

  • Reduced microbial diversity
  • Increased abundance of pro-inflammatory bacteria
  • Associations between dysbiosis and elevated levels of CRP and IL-6

The emerging picture is clear. The gut can act as a trigger or amplifier of the inflammatory processes that manifest in the skin.

The Functional Medicine Perspective: From Symptoms to the Causes of Inflammation

Conventional medicine primarily focuses on managing psoriasis symptoms with topical or systemic treatments. Functional medicine, on the other hand, aims to answer a different question: why did the disease develop in this particular individual. Within this framework, the gut microbiome becomes a central area of investigation. The functional approach evaluates:

  • The composition of the microbiome
  • The presence of pathogenic microorganisms
  • Intestinal permeability
  • Inflammatory activity
     

This approach is particularly important because psoriasis is not the same for everyone. Two individuals with similar symptoms may have entirely different underlying mechanisms. For example:

  • In one patient, dysbiosis may be linked to long-term antibiotic use.
  • In another, it may be associated with a low-fiber diet.
  • In a third, it may be connected to chronic inflammation and metabolic syndrome.
     

Personalization is key. In this context, specific laboratory tests can provide valuable insights:

  • EnteroScan®: Analyzes the composition of the gut microbiome and identifies dysbiosis, pathogens, and functional imbalances.
  • NutriScan®: Assesses micronutrient status that influences immune regulation and overall metabolic function.
  • ImmuneScan®: Evaluates key markers of systemic inflammation and immune activation. hs-CRP is a sensitive marker of low-grade chronic inflammation, while IL-6 is a cytokine with a central role in the inflammatory pathways involved in psoriasis. Their combined assessment provides a more comprehensive picture of inflammatory activity and helps monitor disease progression and response to interventions.

The value of these tests is not purely diagnostic. They enable the development of a personalized intervention plan that targets underlying mechanisms rather than only symptoms. Scientific literature supports this approach. Studies suggest that modulation of the gut microbiome may reduce inflammatory markers such as CRP and IL-6 and improve clinical outcomes in psoriasis.

Diet and Lifestyle: Practical Interventions with Scientific Basis

The encouraging news is that the microbiome is dynamic. It can change, often relatively quickly, when conditions change. Diet is the most important regulator. The following evidence-based strategies can support microbiome balance and reduce inflammation:

1. Increasing Fiber Intake
Dietary fiber serves as fuel for beneficial gut bacteria.

  • Foods to prioritize include:
  • Vegetables, especially leafy greens
  • Legumes
  • Whole grains
  • Fruits with a low glycemic load

Fiber fermentation produces short-chain fatty acids, which have anti-inflammatory properties and support intestinal barrier integrity.

2. Reducing Ultra-Processed Foods
Highly processed foods are associated with:

  • Reduced microbial diversity
  • Increased inflammation
  • Worsening metabolic markers

Reducing sugar, trans fats, and additives is a fundamental step toward restoring balance.

3. Targeted Use of Probiotics and Prebiotics
Certain probiotic strains have been associated with:

  • Reduction in CRP
  • Reduction in IL-6
  • Improvement in clinical manifestations of psoriasis

However, not all probiotics are the same. Selection should be individualized based on specific needs.

4. Weight Management
Obesity is linked to chronic inflammation and more severe psoriasis. Weight reduction can:

  • Lower inflammatory markers
  • Improve response to treatment
     

5. Stress Management
Stress directly affects the gut–brain–skin axis. Helpful practices include:

  • Regular physical activity
  • Breathing techniques
  • Adequate sleep
     

6. Limiting Alcohol and Smoking
Both factors negatively impact the microbiome and promote inflammation. Implementing these changes does not need to be abrupt or extreme. Gradual and consistent improvement is more effective in the long term. Most importantly, through diet and lifestyle, individuals can take an active role in managing their condition.

Conclusion and Next Step

Psoriasis is a multifactorial disease in which the gut microbiome appears to play a central role. Understanding this connection opens new possibilities for prevention, monitoring, and personalized intervention. Instead of focusing only on the visible outcome, we can investigate the underlying processes that drive the condition. Modern functional medicine testing provides the tools to support this deeper level of assessment, enabling targeted, individualized strategies.

What You Can Do Today:

  • Discover what is truly happening in your body through EnteroScan®, a specialized functional analysis of the gut microbiome, so that you can implement dietary practices that are appropriate for your individual physiology.
  • See how Functional Medicine can help you in practice, by identifying root causes instead of just masking symptoms.
  • Subscribe to our newsletter to be the first to receive updates on new preventive tests, wellness articles, and practical advice from Diagnostiki Athinon.
References
  1. Pachauri A, Sharma S. Unravelling the gut-skin axis: the role of gut microbiota in pathogenesis and management of psoriasis. Inflammopharmacology. 2025 Jul;33(7):3671-3678. doi: 10.1007/s10787-025-01813-y. Epub 2025 Jun 12. PMID: 40504322.Secchiero, P., Rimondi, E., Marcuzzi, A., Longo, G. (2024). Metabolic syndrome and psoriasis, pivotal roles of chronic inflammation and gut microbiota. International Journal of Molecular Sciences, 25(15), 8098.
  2. Gao Y, Lou Y, Hui Y, Chen H, Sang H, Liu F. Characterization of the Gut Microbiota in Patients with Psoriasis: A Systematic Review. Pathogens. 2025 Apr 7;14(4):358. doi: 10.3390/pathogens14040358. PMID: 40333159; PMCID: PMC12029981.Zou, X., Gao, L., Zhao, H. (2024). Gut microbiota and psoriasis, pathogenesis, targeted therapy, and future directions. Frontiers in Cellular and Infection Microbiology.
  3. Memariani M, Memariani H. New horizons in the treatment of psoriasis: Modulation of gut microbiome. Heliyon. 2025 Jan 3;11(1):e41672. doi: 10.1016/j.heliyon.2025.e41672. PMID: 39866422; PMCID: PMC11760288.Cozma, E.C., Avram, I., Voiculescu, V.M., Mihai, M.M. (2024). Correlations between gut microbiota and inflammatory parameters in psoriasis patients. International Journal of Molecular Sciences, 25(12), 6649.
  4. Zhu Y, Xu F, Chen H, Zheng Q. The efficacy and safety of probiotics in the adjuvant treatment of psoriasis: a systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2024 Sep 6;11:1448626. doi: 10.3389/fmed.2024.1448626. PMID: 39328313; PMCID: PMC11426359.Kreouzi, M., Theodorakis, N., Nikolaou, M., Feretzakis, G. (2025). Skin microbiota and inflammatory pathways in psoriasis. Microorganisms, 13(1), 161.
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At Diagnostiki Athinon, we treat prevention with the seriousness it deserves. This is where science meets personalized care.

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