By Dr. Emily Johnson · Published June 9, 2025 · 12 min read
The autoimmune protocol AIP diet is a science-informed elimination protocol designed to reduce inflammation, heal the gut lining, and identify dietary triggers that may be worsening autoimmune conditions. It is not a permanent diet — it is a structured diagnostic tool that begins with strict elimination and ends with a personalized, evidence-based maintenance plan.
If you have been diagnosed with an autoimmune disease — or suspect unresolved inflammation is affecting your health — this guide covers everything you need to know before starting.
⚠️ Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. The AIP diet is a significant dietary intervention. Consult a registered dietitian or healthcare professional before starting, especially if you have an active autoimmune diagnosis, take medication, or are pregnant.
What Is the Autoimmune Protocol Diet?
The Autoimmune Protocol (AIP) is an elimination diet developed from the paleo framework by Dr. Loren Cordain and later expanded by Dr. Sarah Ballantyne (The Paleo Mom) into its current evidence-informed form. The protocol removes specific food groups believed to increase intestinal permeability, provoke immune dysregulation, or trigger inflammatory cascades in people with autoimmune conditions.
AIP is used as a dietary intervention for conditions including inflammatory bowel disease (IBD), Hashimoto's thyroiditis, rheumatoid arthritis, psoriasis, lupus, and multiple sclerosis. It operates in three distinct phases: elimination, reintroduction, and maintenance.
The core theory is straightforward: remove all plausible dietary triggers, let the immune system calm down, then systematically reintroduce foods to build a personal map of tolerance.
How AIP Works: The Gut-Immune Connection
Approximately 70-75% of the immune system is housed in the gut. The health of the intestinal lining — specifically its ability to act as a selective barrier — directly influences immune activity throughout the body.
When the intestinal barrier is compromised (sometimes called leaky gut or increased intestinal permeability), proteins from food, gut bacteria, and bacterial byproducts can cross into the bloodstream. The immune system mounts a response against these foreign particles, which can trigger or amplify systemic inflammation.
The AIP diet targets several mechanisms simultaneously:
- Removing lectins and saponins — compounds found in grains, legumes, and nightshades that may increase intestinal permeability
- Eliminating gluten — a well-established trigger for gut inflammation, particularly in genetically susceptible individuals
- Removing potential allergens and irritants — eggs, nightshades, nuts, seeds, and NSAIDs that may stress the gut lining
- Supplying gut-healing nutrients — bone broth (collagen, glycine), fatty fish (omega-3s), and fermented vegetables (probiotics) that are emphasized during the protocol
This is why AIP goes further than the paleo diet — it removes several foods that paleo permits, specifically because those foods have theoretical mechanisms for triggering immune responses in susceptible individuals.
The 3 Phases of the AIP Diet
Understanding the phase structure is essential before starting. Many people attempt AIP without a clear reintroduction plan — which is where most of the protocol's value actually lives.
Phase 1: Elimination (30–90 Days)
Remove all potentially inflammatory foods from your diet completely. The minimum duration is 30 days, but most practitioners recommend 60-90 days to allow inflammatory markers to stabilize and symptoms to resolve meaningfully.
The key rule: do not begin reintroduction until your symptoms have been stable for at least two to four weeks.
Phase 2: Reintroduction (Ongoing, Structured)
This phase is the diagnostic heart of the AIP protocol. You reintroduce removed foods one at a time, every 5-7 days, and monitor for symptom reactions. The standard reintroduction order moves from least to most likely to cause reactions:
- Stage 1 — Seed-based spices (cumin, coriander), legume sprouts, egg yolks (separate from whites), fruit-based sweeteners (small amounts)
- Stage 2 — Seeds and seed-based oils, cocoa and coffee (plain), egg whites, grass-fed dairy butter, cream, and ghee
- Stage 3 — Nightshades without seeds (peeled cucumber, squash), peppers (fresh), cream cheese and fermented dairy, grain-fed animal products
- Stage 4 — Grains (rice first, then oats, then wheat), legumes, nightshades with seeds (tomatoes, eggplant), dairy (milk, cheese), alcohol in moderation
If a food causes a symptom flare — digestive distress, joint pain, skin reaction, fatigue — remove it again and wait until symptoms resolve before trying the next food.
Phase 3: Maintenance (Long-Term)
Your maintenance diet is unique to you. It consists of all the foods from the elimination phase plus any reintroduced foods that did not provoke reactions. Most people on long-term AIP maintenance end up with a diet far more flexible than the elimination phase — but with a much clearer understanding of their personal triggers.
AIP Diet Food List
The food rules are specific. Print this list or save it before your first shopping trip.
Foods to Eat on AIP
- Meats and seafood — all grass-fed, pasture-raised, or wild-caught meats; organ meats (liver, kidney) are especially encouraged for nutrient density
- Vegetables — all vegetables except nightshades (see avoid list); emphasis on leafy greens, cruciferous vegetables, root vegetables (sweet potato, beets, turnips), and sea vegetables
- Fruit — all whole fruits in moderation (aim for 2-4 servings per day to manage sugar intake)
- Healthy fats — avocado, avocado oil, coconut oil, olive oil, lard, and tallow from quality animal sources
- Fermented foods — kombucha, coconut yogurt, water kefir, kimchi made without nightshades or chili
- Herbs and spices — all fresh and dried herbs that are leaf-based (basil, thyme, rosemary, oregano, parsley, mint); ginger and turmeric are strongly encouraged
- Bone broth — homemade or high-quality commercial broth; a staple for gut healing
- Natural sweeteners — small amounts of honey, maple syrup, or coconut sugar (not regular use)
Foods to Avoid on AIP
- Grains — all grains including wheat, rice, oats, corn, and pseudo-grains (quinoa, buckwheat)
- Legumes — all beans, lentils, peanuts, soy in all forms (including edamame, tofu, soy sauce)
- Dairy — all dairy products (milk, cheese, butter, whey protein, yogurt)
- Eggs — both yolks and whites during the elimination phase
- Nightshades — tomatoes, bell peppers, chili peppers, eggplant, white potatoes, goji berries, and spices derived from nightshades (paprika, cayenne, chili powder)
- Nuts and seeds — all nuts (including nut oils), seeds, and seed-based spices (mustard, cumin, coriander, caraway)
- Alcohol — all forms
- Coffee — eliminated in the initial phase; often reintroduced in Stage 2
- Refined sugars and additives — all refined sugars, food colorings, emulsifiers, artificial sweeteners, and thickeners
- NSAIDs — ibuprofen and aspirin are excluded for the duration of the elimination phase; discuss with your doctor before stopping any medication
| Category | AIP Allowed | AIP Eliminated |
|---|---|---|
| Proteins | Grass-fed meat, wild fish, organ meats, bone broth | Eggs, legumes, processed meats |
| Carbs | All vegetables (non-nightshade), root vegetables, fruit | Grains, nightshades, pseudo-grains |
| Fats | Avocado oil, coconut oil, olive oil, animal fats | Nuts, seeds, nut oils, dairy butter |
| Dairy | Coconut milk, coconut yogurt (unsweetened) | All conventional dairy products |
| Beverages | Herbal tea, water, bone broth, kombucha | Alcohol, coffee, sugary drinks |
| Sweeteners | Small amounts of honey or maple syrup | Refined sugars, artificial sweeteners |
| Spices | Leaf herbs (thyme, basil, oregano), turmeric, ginger | Seed spices (cumin, coriander), nightshade spices |
AIP vs. Paleo vs. Whole30
If you have looked into gut-healing or elimination diets before, you may be comparing AIP against paleo or Whole30. Each has a different purpose and a different level of restriction.
| Feature | AIP | Paleo | Whole30 |
|---|---|---|---|
| Purpose | Identify autoimmune triggers, heal gut | Ancestral eating pattern, general health | Reset diet habits, identify sensitivities |
| Duration | 30–90 days elimination + reintroduction | Long-term lifestyle | Exactly 30 days, no reintroduction |
| Grains | Eliminated | Eliminated | Eliminated |
| Legumes | Eliminated | Eliminated | Eliminated |
| Dairy | Eliminated | Eliminated | Eliminated |
| Eggs | Eliminated | Allowed | Allowed |
| Nightshades | Eliminated | Allowed | Allowed |
| Nuts and seeds | Eliminated | Allowed | Allowed (except peanuts) |
| Coffee | Eliminated (then reintroduced) | Allowed | Allowed (black only) |
| Scientific basis | Gut permeability + immune modulation | Evolutionary nutrition | Food sensitivity reset |
| Strictness | Most strict | Moderate | Moderate-strict |
The key takeaway: if you are managing an active autoimmune condition, AIP is the most clinically targeted option. If you are pursuing general health improvements, paleo or a structured whole30 meal plan may be less disruptive starting points.
What Does Science Say?
The evidence base for AIP is still growing, but several well-designed pilot studies have produced encouraging results.
AIP and Inflammatory Bowel Disease
A 2017 study published in Inflammatory Bowel Diseases (Konijeti et al., Scripps Clinic) followed 15 patients with IBD (Crohn's disease or ulcerative colitis) through an 11-week AIP protocol.
- 73% of participants achieved clinical remission by week 6 (11 of 15 patients)
- All 11 maintained remission through week 11
- Fecal calprotectin — a key intestinal inflammation marker — dropped from 471 to 112 µg/g
- Quality of life scores improved significantly across all participants
AIP and Hashimoto's Thyroiditis
A 2019 pilot study in Cureus (Abbott et al.) followed 13 women with Hashimoto's through a 10-week AIP-based intervention.
- Symptom burden decreased by approximately 68% (Medical Symptom Questionnaire score dropped from 92 to 29)
- High-sensitivity C-reactive protein (hs-CRP) fell by 29%
- All eight quality-of-life subscales improved significantly
- Six of 13 participants reduced their thyroid hormone medication dosage
ℹ️ Important Caveat
Every AIP study to date has been a small pilot study with fewer than 30 participants. There are no large-scale randomized controlled trials. Results are promising but should be interpreted cautiously. AIP is best understood as a tool worth exploring under medical guidance — not a guaranteed cure.
AIP for Other Conditions
Preliminary research and clinical observation support AIP for rheumatoid arthritis (RA), psoriasis, and multiple sclerosis, though the evidence is weaker. A 2024 systematic review in Frontiers concluded that AIP "shows promise as a personalized elimination diet" and called for larger randomized trials to establish clinical recommendations.
Nutrient Deficiencies to Watch For
The elimination phase of AIP removes several food categories that are major nutrient sources. Without planning, deficiencies can develop — particularly during a longer elimination.
| Nutrient | Why at Risk | AIP-Compliant Sources |
|---|---|---|
| Calcium | Dairy eliminated | Leafy greens (kale, bok choy), sardines with bones, bone broth |
| Folate (B9) | Legumes and grains eliminated | Liver, leafy greens, asparagus, broccoli, beets |
| Riboflavin (B2) | Dairy, eggs, and grains eliminated | Liver, beef, leafy greens, mushrooms, salmon |
| Zinc | Nuts, seeds, and legumes eliminated | Oysters, beef, pumpkin seeds (Stage 2), organ meats |
| Magnesium | Nuts, seeds, and grains eliminated | Leafy greens, avocado, dark chocolate (Stage 2), blackstrap molasses |
| Vitamin D | Dairy eliminated | Fatty fish, cod liver oil, safe sun exposure |
| Fiber | Grains and legumes eliminated | Leafy greens, cruciferous vegetables, fruit, root vegetables |
The Abbott 2019 Hashimoto's study noted that 50% of participants showed nutrient deficiencies during AIP. Working with a registered dietitian to monitor blood markers every 4-6 weeks during elimination is strongly recommended.
Who Should (and Should Not) Try AIP
AIP May Be Worth Exploring If You:
- Have a confirmed autoimmune diagnosis (IBD, Hashimoto's, RA, psoriasis, lupus, celiac disease)
- Have persistent inflammation markers despite other dietary changes
- Have responded partially to an anti-inflammatory diet but suspect specific food triggers remain
- Are working with a healthcare provider willing to monitor your progress
AIP Is Not Recommended If You:
- Are pregnant or breastfeeding (nutrient restriction risks are significant)
- Are underweight or have a history of disordered eating or orthorexia
- Have type 1 diabetes without close medical supervision
- Are a competitive athlete with high energy demands (the elimination phase is difficult to sustain at high training volumes)
- Are unwilling to commit to the reintroduction phase — without it, the diagnostic purpose of AIP is lost
How to Get Started With AIP
Starting AIP without preparation leads to overwhelm and early dropout. These steps help you set up for success.
If you are starting from a standard Western diet, moving directly to full AIP is a significant jump. Consider spending 2-4 weeks eating a gluten-free meal plan or an anti-inflammatory diet first to ease the transition and reduce early withdrawal symptoms.
One of the most valuable things you can do during both the elimination and reintroduction phases is track your food in detail. Knowing exactly what you ate the day before a symptom flare — including spices, cooking oils, and sauces — is critical for accurate trigger identification. Caloria makes this effortless: snap a photo of your meal and get instant macro and ingredient data without manual logging.
Frequently Asked Questions
What foods are not allowed on the AIP diet?
The AIP elimination phase removes grains, legumes, dairy, eggs, nightshades (tomatoes, peppers, eggplant, white potatoes), nuts, seeds, coffee, alcohol, refined sugars, food additives, and seed-based spices. These are reintroduced one at a time after 30-90 days to identify personal triggers.
How long does the AIP elimination phase last?
Most practitioners recommend 30 to 90 days. People with more severe autoimmune symptoms often benefit from the full 90 days before beginning reintroduction. You should not start reintroduction until your symptoms have been stable for at least 2-4 weeks.
Does the AIP diet really work for autoimmune disease?
Early research is promising. A 2017 study found 73% of IBD patients achieved clinical remission within 6 weeks on AIP. A 2019 study showed a 68% reduction in symptom burden for Hashimoto's thyroiditis. However, all existing studies are small pilots — larger randomized trials are needed to establish firm clinical recommendations.
What is the difference between the AIP diet and the paleo diet?
AIP is a stricter therapeutic extension of the paleo diet. Both eliminate grains, legumes, dairy, and processed foods. AIP additionally removes eggs, nightshades, nuts, seeds, alcohol, and coffee. AIP also includes a structured reintroduction phase that traditional paleo does not.
Can the AIP diet help with Hashimoto's thyroiditis?
A 2019 pilot study found that a 10-week AIP intervention reduced symptom burden by approximately 68% and lowered inflammatory markers by 29% in people with Hashimoto's. Six of 13 participants were able to reduce their thyroid medication dosage. Results were significant but the sample size was small; discuss AIP with your endocrinologist before starting.
Start Tracking Smarter on AIP
The AIP diet requires precision — especially during reintroduction, when the difference between a symptom flare and a cleared food can come down to a single ingredient in a sauce. Understanding your intake is the first step; tracking it consistently is the second.
Caloria makes it effortless: take a photo of your meal and get instant calorie and macro data — no manual entry, no guesswork. Pair it with a symptom journal and you will have the clearest picture possible of how food affects your body.
Download Caloria and take the guesswork out of elimination: