Autoimmune Disease and Diet: Why the Autoimmune Protocol May Be Worth Exploring

When you live with an autoimmune condition, it can sometimes feel as though your body is working against you.

Autoimmune disease occurs when the immune system loses some of its ability to distinguish between what belongs in the body and what does not. This can lead to an ongoing immune response and inflammation that may affect the joints, gastrointestinal tract, skin, thyroid, nervous system, glands, or other tissues.

But what if the food you eat could help calm some of that immune activity?

Nutrition cannot change the fact that someone has an autoimmune condition, but it can be a powerful tool for supporting the body’s nutritional needs, gut health, and inflammatory balance—and for some people, changing their diet can make a noticeable difference in symptoms.

My experience with the Autoimmune Protocol

My interest in the Autoimmune Protocol (AIP) is both professional and personal.

After developing autoimmune symptoms myself, I decided to try the AIP approach. I was surprised by how significantly my symptoms improved.

Since then, I have also seen dietary changes make a meaningful difference in clients dealing with autoimmune conditions, including rheumatoid arthritis, lupus, Sjögren’s syndrome, and inflammatory bowel disease.

Those experiences led me to look more closely at what we actually know about the AIP approach.

And while the research is still developing, there is now clinical research showing some promising results.

What is the AIP diet?

The Autoimmune Protocol is an elimination and reintroduction approach designed to temporarily remove foods that may be problematic for some people while emphasizing nutrient-dense, whole foods.

The elimination phase generally removes grains, legumes, dairy, eggs, nuts and seeds, nightshade vegetables, alcohol, refined sugars, and highly processed foods.

The goal is not to declare these foods universally “bad.”

In fact, many of these foods can be nutritious and well tolerated.

Instead, AIP asks a different question:

Could one or more foods be contributing to symptoms in this particular person?

This can be especially interesting with foods containing compounds such as lectins and other plant defense compounds, or with foods such as nightshades that some individuals report they do not tolerate well.

There is not good evidence that these foods are inherently inflammatory for everyone. The value of an elimination diet is that it allows you to remove potential triggers, observe what happens, and then systematically reintroduce foods to determine individual tolerance.

What does the research show?

The AIP research is still relatively small, but the findings are interesting.

A 2026 pilot study in adults with rheumatoid arthritis followed nine participants through their usual diet and then an eight-week AIP intervention. Seven of the nine participants experienced improvements in patient-reported outcomes, with improvements also reported in pain, fatigue, and sleep. (⁠PubMed)

Research in inflammatory bowel disease has also been encouraging. In one study of 15 adults with active Crohn’s disease or ulcerative colitis, disease activity scores improved during the AIP elimination and maintenance phases. Improvements in endoscopic inflammation were also observed in several participants who completed follow-up endoscopy. (⁠PubMed)

Another study found significant improvements in quality of life, bowel frequency, stress, and ability to participate in activities among people with IBD following an AIP diet. (⁠PubMed)

A pilot study in women with Hashimoto’s thyroiditis found significant improvements in quality of life and symptom burden, along with a 29% reduction in hs-CRP. Interestingly, thyroid hormone levels and thyroid antibodies did not significantly change—an important reminder that feeling better and changing disease biomarkers are not necessarily the same thing. (⁠PubMed)

A recent review of the AIP literature also highlights the potential relationship between dietary triggers, intestinal health, the gut microbiome, and immune regulation, while identifying the need for larger clinical trials. (⁠PubMed)

Why might this approach help?

There probably isn’t one single explanation.

The AIP approach changes many aspects of the diet at once: it increases nutrient density while removing many highly processed foods and temporarily eliminating foods that may be problematic for an individual.

It also places considerable emphasis on vegetables, fruits, quality proteins, seafood, healthy fats, and other nutrient-rich foods.

And then there is the gut.

The gastrointestinal tract is closely connected to the immune system. The gut microbiome, intestinal barrier, and immune system interact continuously. Diet can influence this environment, which is one reason nutrition has become an increasingly important area of research in autoimmune disease.

The most important part: reintroduction

I don’t believe the goal of AIP should be to stay on a highly restricted diet forever.

The reintroduction phase is essential.

Once symptoms have stabilized, foods are gradually reintroduced one at a time while paying attention to symptoms and tolerance.

You may discover that some foods you thought you needed to avoid are actually perfectly fine for you.

You may also discover that certain foods consistently bring symptoms back.

That information can be incredibly valuable.

Food is information.

Your response to food can provide clues about what your body tolerates well—and what it may not.

The AIP approach gives us a structured way to gather that information while still focusing on nutrient density and nourishment.

For someone with autoimmune disease, that can make food more than simply something we eat.

It can become a tool for understanding your body and supporting how you feel every day.

References

1. The Effect of an Autoimmune Protocol (AIP) Diet in Adults With Rheumatoid Arthritis: A Single Arm Crossover Pilot Feasibility Study. 2026.  

2. Efficacy of the Autoimmune Protocol Diet for Inflammatory Bowel Disease. Inflammatory Bowel Diseases. 2017.  

3. An Autoimmune Protocol Diet Improves Patient-Reported Quality of Life in Inflammatory Bowel Disease. Crohn’s & Colitis 360. 2019.  

4. Efficacy of the Autoimmune Protocol Diet as Part of a Multi-disciplinary, Supported Lifestyle Intervention for Hashimoto’s Thyroiditis. Cureus. 2019.  

5. Autoimmune protocol diet: A personalized elimination diet for patients with autoimmune diseases. Metabolism Open. 2025.