If you have been navigating an autoimmune condition and feel like you have tried everything, there is a good chance no one has talked to you about what is happening in your gut. The connection between gut health and autoimmune function is one of the most discussed topics in integrative medicine right now, and for good reason.

Your gut is home to approximately 70 to 80 percent of your immune system. The trillions of bacteria, fungi, and other microorganisms that live in your digestive tract are not just helping you absorb nutrients. They are in constant communication with your immune system, your nervous system, and your brain through what researchers call the gut-brain-immune axis.

When the balance of your gut microbiome is disrupted, a condition known as dysbiosis, your immune system can become dysregulated. The gut lining, which is only one cell thick, can become permeable, a state often referred to as leaky gut. When this happens, particles that should stay in your digestive tract enter your bloodstream, triggering immune responses that can contribute to systemic inflammation and, in genetically predisposed individuals, autoimmune activity.

In my own journey with Graves disease and later MS, the shift I made to a whole food, plant-based diet was not just about removing inflammatory foods. It was unknowingly one of the most powerful things I could have done for my gut microbiome. Plant diversity feeds the beneficial bacteria in your gut. Processed foods, alcohol, sugar, and certain medications do the opposite.

What You Can Do

The research on the gut-immune connection points to a few consistent recommendations. Increase the diversity of plants in your diet. Aim for 30 or more different plant foods each week, including vegetables, fruits, legumes, whole grains, nuts, seeds, and herbs. Each of these feeds different strains of beneficial bacteria, contributing to a more resilient microbiome.

Reduce or eliminate ultra-processed foods, alcohol, and refined sugar. These consistently show up in the research as damaging to gut barrier function and beneficial bacterial populations.

Manage stress actively. The gut-brain connection is bidirectional, meaning chronic stress directly impacts your gut health. Nervous system regulation practices like breathwork, gentle movement, and sleep are not optional add-ons. They are part of the foundation.

Consider fermented foods. Kimchi, sauerkraut, kefir if you are not dairy-free, and kombucha all contain live cultures that can contribute to microbiome diversity. The research here is still evolving, but the signal is positive.

As always, this is not medical advice. If you are managing an autoimmune condition, please work alongside your healthcare provider with any changes. But arming yourself with this information and asking your team the right questions? That is exactly what advocating for yourself looks like.