The health and diversity of our gut microbiome is a key player in many factors of our health and wellness. Beyond aiding digestion, the microbiome plays a vital role in regulating the immune system. One of the most fascinating areas of research is the connection between gut health and autoimmune diseases.
From Hashimoto’s thyroiditis to rheumatoid arthritis, studies increasingly suggest that dysbiosis (disruptions in the gut microbiome) may trigger or worsen autoimmune conditions. But how exactly are the gut microbiome and autoimmune disease connected? And can improving gut health help prevent or manage autoimmune disorders?
In this blog post, we’ll explore:
- The science behind the gut-immune connection
- How dysbiosis contributes to autoimmune disease
- What you can do to support a healthy microbiome
What Is the Gut Microbiome?
The gut microbiome refers to the trillions of bacteria, viruses, fungi, and other microorganisms that live in your gastrointestinal tract. There are more microorganisms in your gut than the cells in your entire body. These microbes are crucial for digestion and immune regulation.
A healthy gut microbiome is diverse and balanced. These microbes produce short-chain fatty acids (SCFAs) like butyrate, which help reduce inflammation and maintain the integrity of the intestinal lining.
The Gut and the Immune System
About 70% of the immune system is in the gut which means your gut is in constant communication with your immune cells. A balanced microbiome helps:
- Regulate immune responses
- Prevent excess inflammation
- Promote immune tolerance to non-harmful substances
When this balance is disturbed, it can lead to chronic inflammation, which is a hallmark of many autoimmune diseases.
Dysbiosis and Autoimmune Disease: What’s the Link
Dysbiosis, or an imbalance in the gut microbiome, can contribute to the onset and progression of autoimmune diseases through several mechanisms:
1. Increased Intestinal Permeability (Leaky Gut)
Increased intestinal permeability, commonly referred to as “leaky gut,” may play a role in the development of autoimmune diseases. In this condition, the integrity of the intestinal barrier is compromised, allowing bacteria, toxins, and undigested food particles to translocate into the bloodstream, potentially triggering systemic inflammation and autoimmune responses [1, 2, 3].
2. Molecular Mimicry
Some gut bacteria share molecular structures with human tissues. When the immune system attacks these bacteria, it may mistakenly target the body’s own cells, leading to autoimmunity. This has been observed in inflammatory bowel disease, multiple sclerosis, type 1 diabetes, lupus, and rheumatoid arthritis [4]. There is also data showing that our reduced exposure to microbes in our environment can be contributors to these conditions.
3. T-Cell Imbalance
A healthy microbiome helps maintain the balance between pro-inflammatory Th17 cells and anti-inflammatory Treg cells. Dysbiosis often tips the scale toward Th17 dominance, contributing to autoimmune responses [5, 6].
Autoimmune Diseases Linked to Gut Microbiome Imbalance
Hashimoto’s Thyroiditis (Autoimmune Hypothyroidism)
Individuals with Hashimoto’s Thyroiditis exhibit distinct changes in their gut microbiota compared to healthy individuals. Notably, there is a significant reduction in bacterial diversity and richness in Hashimoto’s patients. Specific alterations include a decrease in beneficial bacteria such as Bifidobacterium and Lactobacillus, and an increase in potentially inflammatory bacteria like Klebsiella. [7]
Grave’s Disease (Autoimmune Hyperthyroidism)
Studies have demonstrated notable differences in the gut microbiota of Grave’s Disease patients compared to healthy individuals. Bacterial richness and diversity are significantly impacted in Grave’s Disease patients. There is also an increased abundance of certain bacteria, such as Prevotella, and Veillonella, which may contribute to the onset and exacerbation of Grave’s Disease [8].
Inflammatory Bowel Disease (IBD)
While IBD affects the gut directly, it is also an autoimmune condition. People with IBD consistently show signs of gut dysbiosis, including reduced microbial diversity and heightened amounts of pro-inflammatory species [9].
Rheumatoid Arthritis (RA)
Research shows that people with RA often have elevated levels of Prevotella copri, a bacterium linked to inflammation. This imbalance may contribute to the onset of RA in genetically predisposed individuals [10].
Multiple Sclerosis (MS)
MS patients often have reduced levels of anti-inflammatory gut bacteria. Studies transferring gut bacteria from MS patients to mice have triggered MS-like symptoms, highlighting a possible causal connection [11].
Can You Improve Autoimmune Symptoms by Healing the Gut?
Optimizing your gut health supports immune regulation and can help reduce autoimmune flare-ups. Diagnostic and functional testing provide insights into the cause for each individual case and no two are alike. However, there are some baseline recommendations that can begin to help.
✅ Eat Probiotic Rich Foods
Probiotic supplements and probiotic-rich foods can help restore microbial balance. Supplementation with probiotics is most effective when it’s targeted based on the gut microbiome testing we offer. However, anyone can benefit from incorporating some probiotic rich foods into their diet. Here are some of those foods:
- Yogurt/Kefir (Regular or dairy-free depending on tolerance)
- Kombucha
- Kimchi
- Sauerkraut
- Pickles (fermented in brine which is just salt and water. If pickles are fermented in vinegar, it kills all the probiotic bacteria)
- Tempeh
- Miso
✅ Anti-Inflammatory Diet
Reducing inflammatory foods in the diet helps reduce inflammation in the gut and throughout the entire body. This can help reduce autoimmune flare-ups. Food sensitivity and allergy testing can help to elucidate your individual triggers to make sure you are only reducing/removing what is necessary. Common triggers are gluten and dairy, but not everyone is reactive to them and there can be many other foods you are reactive to.
✅ Lifestyle Changes
Managing stress through breath-work and meditation, getting enough high-quality sleep, and moving your body regularly all help to begin regulating the immune system and bring balance back into the body.
Final Thoughts
The connection between the gut microbiome and autoimmune disease is undeniable. Although research is ongoing, it’s clear that maintaining a healthy gut microbiome is one of the most powerful tools we have for supporting the immune system and managing autoimmune conditions.
If you or a loved one is dealing with an autoimmune disorder, it might be time to look inward toward the gut. Healing your gut can be a foundational step toward feeling better.
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References:
[1] https://pubmed.ncbi.nlm.nih.gov/28588585/
[2] https://pubmed.ncbi.nlm.nih.gov/28588585/
[3] https://pubmed.ncbi.nlm.nih.gov/39638978/
[4] https://pubmed.ncbi.nlm.nih.gov/35572569/
[5] https://pubmed.ncbi.nlm.nih.gov/35003133/
[6] https://pubmed.ncbi.nlm.nih.gov/30471408/
[7] https://pubmed.ncbi.nlm.nih.gov/35534624/
[8] https://pubmed.ncbi.nlm.nih.gov/33224194/
[9] https://pmc.ncbi.nlm.nih.gov/articles/PMC5198157/
[10] https://pubmed.ncbi.nlm.nih.gov/34026662/
[11] https://pmc.ncbi.nlm.nih.gov/articles/PMC5635914
About the author:
I’m Dr. Rob Boyd, ND, CNS and I am a licensed naturopathic doctor specializing in gut health, thyroid disease, and men’s health at Terrain Clinic. I use comprehensive gut microbiome testing, functional medicine, and personalized nutrition to help my clients on their health journey.