Why does AIP remove nightshades?

AIP removes nightshades because tomatoes, peppers, potatoes, and eggplant contain glycoalkaloids that can increase intestinal permeability ("leaky gut") in sensitive people. Many patients with joint pain (rheumatoid arthritis, psoriatic arthritis) report significant relief when nightshades come out.

Is the AIP diet keto?

The AIP diet is not keto. You can eat carbohydrates from sweet potatoes, squash, plantains, and fruit. We actually encourage carbs during AIP to support thyroid function and stress response.

Do I have to follow the AIP diet forever?

You do not have to follow the AIP diet forever. The goal is the broadest possible diet that does not trigger symptoms. Most patients successfully reintroduce rice, eggs, and nuts. Usually only 1 or 2 specific triggers stay permanently excluded.

How long does AIP elimination take to work?

AIP elimination usually takes 30 to 90 days to show clear benefit. Many patients feel changes (less bloating, less joint pain, better energy) within 2 to 3 weeks. Deeper healing of gut and joint inflammation can take 2 to 3 months.

Can the AIP diet help Hashimoto's thyroiditis?

The AIP diet can help Hashimoto's thyroiditis. A 2019 study showed measurable improvements in symptom scores and quality of life, along with reductions in CRP, in Hashimoto's patients on AIP. Thyroid antibody changes were modest, but symptom relief was significant.

Is AIP safe during pregnancy?

AIP is generally not recommended during pregnancy without medical supervision. Pregnancy increases nutrient needs (folate, iron, calcium, choline) that AIP can make harder to meet. Modified versions can work with careful planning and physician oversight.

What is the difference between AIP and paleo?

The difference between AIP and paleo is breadth of restriction. Paleo eliminates grains, legumes, and dairy. AIP also eliminates eggs, nuts, seeds, and nightshades. AIP is paleo "turned up" for autoimmune conditions and is meant to be temporary.

Can I drink coffee on AIP?

Coffee is not allowed on strict AIP because of its effect on stress hormones and gut lining. Many patients reintroduce coffee successfully after the elimination phase. Tea (particularly green and herbal) is generally allowed.

How does intestinal permeability drive autoimmunity?

Intestinal permeability ("leaky gut") drives autoimmunity by letting partially digested food and bacterial fragments cross the gut barrier and reach the immune system. The immune system reacts to those fragments and can cross-react with body tissues that look similar (a process called molecular mimicry).

What are lectins and why do they matter?

Lectins are proteins in many plants (particularly legumes, grains, and nightshades) that bind to specific carbohydrates on cell surfaces. In sensitive people, certain lectins can damage the gut lining. The data is mixed for healthy adults, but autoimmune patients often see real benefit from removing the most reactive sources.

How do saponins affect the gut?

Saponins are soap-like compounds in legumes, nightshades, and some seeds. They can punch holes in cell membranes at high doses. In normal dietary doses, they are usually well tolerated. In some autoimmune patients, they appear to disrupt the gut barrier enough to trigger immune activity.

Why does AIP remove eggs specifically?

AIP removes eggs because lysozyme in the egg white can transport partially digested proteins across the gut wall. In people with leaky gut, this can drive immune reactions. Many autoimmune patients tolerate egg yolks before whites, which is one strategy during reintroduction.

How does AIP differ from a Mediterranean diet for autoimmunity?

AIP differs from a Mediterranean diet for autoimmunity in restriction depth. The Mediterranean diet keeps grains, legumes, and dairy, but reduces red meat and processed food. AIP is short-term and far more restrictive, designed to identify triggers quickly. Many patients land somewhere between the two long-term.

Why is bone broth a staple of AIP?

Bone broth is a staple of AIP because it provides glycine, proline, and gelatin, which support gut lining repair. It also delivers minerals and electrolytes that can be lower on a strict elimination diet. Two cups a day is a common starting point.

What is the role of omega-3s in AIP?

Omega-3s play a major role in AIP by lowering systemic inflammation and rebalancing the omega-6 to omega-3 ratio. Most American diets push the ratio toward 15:1. AIP, paired with fatty fish (sardines, salmon), drops the ratio toward the more anti-inflammatory 4:1.

How does AIP affect the gut microbiome?

AIP affects the gut microbiome by reducing fiber from grains and legumes, which can lower some beneficial species temporarily. Vegetable-derived fibers (particularly from cruciferous vegetables and tubers) maintain other species. Most patients see microbiome rebound after reintroduction.

Can AIP help rheumatoid arthritis?

AIP can help rheumatoid arthritis in many patients, particularly when nightshades are a trigger. Case series and pilot studies show meaningful drops in joint pain and inflammation markers. AIP is not a replacement for disease-modifying drugs, but it often complements them.

How does AIP support medication tapering?

AIP supports medication tapering by lowering the underlying inflammation that medications are managing. As inflammation drops, some patients can work with their physician to lower doses of biologics or steroids. This must be done under medical supervision.

Is AIP appropriate for thin or underweight patients?

AIP is appropriate for thin patients with planning. Adequate calories from fats (coconut, avocado, olive oil) and starchy vegetables (sweet potato, plantain, cassava) prevent unwanted weight loss. We track weight weekly during the first 4 weeks.

What happens during reintroduction reactions?

During reintroduction reactions, you may see joint pain, brain fog, skin flares, bloating, or fatigue within 6 to 72 hours of eating a trigger food. The reaction confirms the food is a real driver and gives you actionable data. Track everything in a journal during reintroduction.

How does AIP interact with immunosuppressant medications?

AIP can interact with immunosuppressant medications by lowering inflammation and potentially the dose required. Never stop medications on your own. Run any tapering plan through the prescribing physician.

Can children follow the AIP diet?

Children can follow a modified version of the AIP diet under physician supervision. Strict AIP is hard for kids, but a "lite" version that removes the top 3 to 5 likely triggers can produce real benefit while preserving caloric and nutrient adequacy.

How does stress sabotage AIP results?

Stress sabotages AIP results by raising cortisol and gut inflammation independent of food. A patient on a perfect AIP diet under chronic stress often plateaus. Sleep, breath work, and modest exercise are part of any AIP plan we run.

What labs should I track during AIP?

The labs to track during AIP include high-sensitivity CRP, ESR, vitamin D, ferritin, B12, full thyroid panel, and (for relevant conditions) autoantibody titers. We typically retest at 90 days to confirm progress.

Why does AIP remove nightshades?

AIP removes nightshades because tomatoes, peppers, potatoes, and eggplant contain glycoalkaloids that can increase intestinal permeability ("leaky gut") in sensitive people. Many patients with joint pain (rheumatoid arthritis, psoriatic arthritis) report significant relief when nightshades come out.

Is the AIP diet keto?

The AIP diet is not keto. You can eat carbohydrates from sweet potatoes, squash, plantains, and fruit. We actually encourage carbs during AIP to support thyroid function and stress response.

Do I have to follow the AIP diet forever?

You do not have to follow the AIP diet forever. The goal is the broadest possible diet that does not trigger symptoms. Most patients successfully reintroduce rice, eggs, and nuts. Usually only 1 or 2 specific triggers stay permanently excluded.

How long does AIP elimination take to work?

AIP elimination usually takes 30 to 90 days to show clear benefit. Many patients feel changes (less bloating, less joint pain, better energy) within 2 to 3 weeks. Deeper healing of gut and joint inflammation can take 2 to 3 months.

Can the AIP diet help Hashimoto's thyroiditis?

The AIP diet can help Hashimoto's thyroiditis. A 2019 study showed measurable improvements in symptom scores and quality of life, along with reductions in CRP, in Hashimoto's patients on AIP. Thyroid antibody changes were modest, but symptom relief was significant.

Is AIP safe during pregnancy?

AIP is generally not recommended during pregnancy without medical supervision. Pregnancy increases nutrient needs (folate, iron, calcium, choline) that AIP can make harder to meet. Modified versions can work with careful planning and physician oversight.

What is the difference between AIP and paleo?

The difference between AIP and paleo is breadth of restriction. Paleo eliminates grains, legumes, and dairy. AIP also eliminates eggs, nuts, seeds, and nightshades. AIP is paleo "turned up" for autoimmune conditions and is meant to be temporary.

Can I drink coffee on AIP?

Coffee is not allowed on strict AIP because of its effect on stress hormones and gut lining. Many patients reintroduce coffee successfully after the elimination phase. Tea (particularly green and herbal) is generally allowed.

How does intestinal permeability drive autoimmunity?

Intestinal permeability ("leaky gut") drives autoimmunity by letting partially digested food and bacterial fragments cross the gut barrier and reach the immune system. The immune system reacts to those fragments and can cross-react with body tissues that look similar (a process called molecular mimicry).

What are lectins and why do they matter?

Lectins are proteins in many plants (particularly legumes, grains, and nightshades) that bind to specific carbohydrates on cell surfaces. In sensitive people, certain lectins can damage the gut lining. The data is mixed for healthy adults, but autoimmune patients often see real benefit from removing the most reactive sources.

How do saponins affect the gut?

Saponins are soap-like compounds in legumes, nightshades, and some seeds. They can punch holes in cell membranes at high doses. In normal dietary doses, they are usually well tolerated. In some autoimmune patients, they appear to disrupt the gut barrier enough to trigger immune activity.

Why does AIP remove eggs specifically?

AIP removes eggs because lysozyme in the egg white can transport partially digested proteins across the gut wall. In people with leaky gut, this can drive immune reactions. Many autoimmune patients tolerate egg yolks before whites, which is one strategy during reintroduction.

How does AIP differ from a Mediterranean diet for autoimmunity?

AIP differs from a Mediterranean diet for autoimmunity in restriction depth. The Mediterranean diet keeps grains, legumes, and dairy, but reduces red meat and processed food. AIP is short-term and far more restrictive, designed to identify triggers quickly. Many patients land somewhere between the two long-term.

Why is bone broth a staple of AIP?

Bone broth is a staple of AIP because it provides glycine, proline, and gelatin, which support gut lining repair. It also delivers minerals and electrolytes that can be lower on a strict elimination diet. Two cups a day is a common starting point.

What is the role of omega-3s in AIP?

Omega-3s play a major role in AIP by lowering systemic inflammation and rebalancing the omega-6 to omega-3 ratio. Most American diets push the ratio toward 15:1. AIP, paired with fatty fish (sardines, salmon), drops the ratio toward the more anti-inflammatory 4:1.

How does AIP affect the gut microbiome?

AIP affects the gut microbiome by reducing fiber from grains and legumes, which can lower some beneficial species temporarily. Vegetable-derived fibers (particularly from cruciferous vegetables and tubers) maintain other species. Most patients see microbiome rebound after reintroduction.

Can AIP help rheumatoid arthritis?

AIP can help rheumatoid arthritis in many patients, particularly when nightshades are a trigger. Case series and pilot studies show meaningful drops in joint pain and inflammation markers. AIP is not a replacement for disease-modifying drugs, but it often complements them.

How does AIP support medication tapering?

AIP supports medication tapering by lowering the underlying inflammation that medications are managing. As inflammation drops, some patients can work with their physician to lower doses of biologics or steroids. This must be done under medical supervision.

Is AIP appropriate for thin or underweight patients?

AIP is appropriate for thin patients with planning. Adequate calories from fats (coconut, avocado, olive oil) and starchy vegetables (sweet potato, plantain, cassava) prevent unwanted weight loss. We track weight weekly during the first 4 weeks.

What happens during reintroduction reactions?

During reintroduction reactions, you may see joint pain, brain fog, skin flares, bloating, or fatigue within 6 to 72 hours of eating a trigger food. The reaction confirms the food is a real driver and gives you actionable data. Track everything in a journal during reintroduction.

How does AIP interact with immunosuppressant medications?

AIP can interact with immunosuppressant medications by lowering inflammation and potentially the dose required. Never stop medications on your own. Run any tapering plan through the prescribing physician.

Can children follow the AIP diet?

Children can follow a modified version of the AIP diet under physician supervision. Strict AIP is hard for kids, but a "lite" version that removes the top 3 to 5 likely triggers can produce real benefit while preserving caloric and nutrient adequacy.

How does stress sabotage AIP results?

Stress sabotages AIP results by raising cortisol and gut inflammation independent of food. A patient on a perfect AIP diet under chronic stress often plateaus. Sleep, breath work, and modest exercise are part of any AIP plan we run.

What labs should I track during AIP?

The labs to track during AIP include high-sensitivity CRP, ESR, vitamin D, ferritin, B12, full thyroid panel, and (for relevant conditions) autoantibody titers. We typically retest at 90 days to confirm progress.

The Autoimmune Protocol (AIP) Diet: A Reset for Your Immune System

TL;DR30-second take

The AIP (Autoimmune Protocol) diet is a temporary 30 to 90 day elimination of grains, legumes, dairy, eggs, nightshades, nuts, seeds, and alcohol to calm immune-driven inflammation. After symptoms settle, foods are reintroduced one at a time to identify your specific triggers. It is a diagnostic tool, not a forever diet.

More than just clean eating

For patients with autoimmune disease (Hashimoto's, rheumatoid arthritis, lupus, IBD), food is not just fuel. It is information. The AIP diet is a temporary, rigorous elimination strategy designed to quiet the immune alarm and let the gut lining heal.

If you have an autoimmune condition, your immune system is confused. It is attacking your own tissue. The AIP diet removes the most common dietary triggers that fuel that confusion. It is not a lifestyle diet to stay on forever. It is a diagnostic tool and a healing phase.

At Fishtown Medicine, we use AIP as a precise intervention to lower inflammation and identify your specific triggers.

What is the science behind the AIP diet?

The science behind the AIP diet was strengthened by a 2017 study showing that diet alone could induce remission in Inflammatory Bowel Disease (IBD).

Dr. Gauree Konijeti at Scripps Clinic ran a study on patients with active Crohn's disease and ulcerative colitis. The intervention was strict AIP. The result: by week 6, 73% of patients achieved clinical remission. That outcome is comparable to many biologic drugs, without the side effects. The study validated that removing inflammatory triggers lets the gut lining heal.

What does the AIP diet remove and what does it keep?

The AIP diet removes the most common immune triggers and keeps nutrient-dense whole foods. It is defined by what you remove, but the meals you keep are the foundation.

Phase 1: Elimination (30 to 90 days)

We remove all common immune irritants:

Grains: Wheat, rice, corn, oats.
Legumes: Beans, soy, peanuts.
Nightshades: Tomatoes, potatoes, peppers, eggplant. They contain lectins and saponins that can irritate the gut.
Dairy and eggs: Common allergens.
Nuts and seeds: Potential irritants for sensitive guts.
Alcohol and NSAIDs: Gut barrier disruptors.

What you eat: Meat, fish, vegetables (lots), fruit (low sugar), healthy fats (avocado, olive, coconut), bone broth.

Phase 2: Reintroduction

This is the most important phase. Once symptoms quiet, you add foods back one at a time.

Reaction? (Bloating, joint pain, rash) means the food is a trigger. Keep it out for now.
No reaction? means the food is safe for you. Keep it in.

How does Fishtown Medicine support the AIP journey?

Fishtown Medicine supports the AIP journey with structured food lists, calorie planning, and tools for real life. AIP is hard. We provide the scaffolding.

Challenge	Fishtown Solution
"What do I eat?"	We provide a detailed yes/no food list and Philly-specific shopping guides (Riverwards Produce, Weavers Way, Whole Foods).
"Im losing weight too fast"	We ensure adequate calories via healthy fats and root vegetables (sweet potato, cassava).
"Social situations"	We coach how to navigate menus. Steak plus steamed veggies is AIP compliant almost anywhere.

Guidance from the Clinic

"You are not restricting yourself. You are protecting yourself."

Why we start early: At Fishtown Medicine, we have seen what happens when autoimmune inflammation goes unmanaged for decades. Our approach is informed by years of treating the complications that develop when early signals are ignored. That experience shapes our urgency. We catch it now so you never have to experience those consequences.

"Dr. Ash, can I cheat on AIP?"

Ideally, no. During the elimination phase, one cookie can set off an immune cascade that lasts days (antibodies have a real half-life). It takes about 21 days for the immune system to calm. Cheating resets the clock. Commit 100% for 30 days. It beats doing 80% for 5 years.

Actionable Steps in Philly

Prep is everything.

Purge the pantry: If it is in the house, you will eat it. Donate the pasta and beans before you start.
Batch cook: Roast 3 trays of veggies and 2 pounds of meat on Sunday. AIP requires cooking. You cannot rely on UberEats.
Find Philly-friendly substitutes: cassava flour tortillas, coconut aminos instead of soy sauce, and Riverwards Produce or Weavers Way for fresh AIP-compliant produce.

Quieting the storm.

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Scientific References

Konijeti GG, et al. "Efficacy of the Autoimmune Protocol Diet for Inflammatory Bowel Disease." Inflammatory Bowel Diseases. 2017.
Abbott RD, et al. "Efficacy of the Autoimmune Protocol Diet as Part of a Multi-disciplinary, Supported Lifestyle Intervention for Hashimoto's Thyroiditis." Cureus. 2019.
Ballantyne S. The Paleo Approach. Victory Belt. 2013.
Fasano A. "Zonulin and its regulation of intestinal barrier function: the biological door to inflammation, autoimmunity, and cancer." Physiological Reviews. 2011.
Vojdani A, et al. "The role of food antigens in autoimmunity." Alternative Therapies in Health and Medicine. 2015.

Metabolic Health - the broader metabolic-health framework
Fasting Protocols - another dietary-pattern intervention
Medical Weight Loss - the durable weight-loss approaches
Gut Health for Performance - the gut-performance axis underlying AIP

Fishtown Medicine | Metabolism

2418 E York St, Philadelphia, PA 19125(267) 360-7927 hello@fishtownmedicine.comHSA/FSA Eligible

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