AIP Diet Guide: What to Eat at Restaurants

Historical Background and Evolution of the Diet

AIP grew out of the broader Paleo movement, tracing its deeper roots back to gastroenterologist Walter Voegtlin in the 1970s and later Loren Cordain, whose work popularized Paleo eating more widely starting in the early 2000s, a lineage already covered in more depth in the Paleo entry elsewhere in this series and worth understanding as the foundation AIP builds directly on top of.

The autoimmune specific version of this broader approach took shape through several contributors: author Robb Wolf outlined an elimination based approach in an earlier book, before biophysicist Sarah Ballantyne, known widely as The Paleo Mom, formalized and popularized the protocol specifically in her 2014 book The Paleo Approach, describing it as a considerably pickier version of Paleo built for people managing autoimmune disease rather than general population health and wellness.^[3]

A genuinely notable turning point came in 2015, when researchers at Scripps Health launched the first formal clinical pilot trial of AIP, moving the protocol from purely community driven wellness content into peer reviewed clinical research for the first time, a distinction that sets it apart from several other commercially popular diets covered elsewhere in this series that have never been the subject of any dedicated clinical study whatsoever.^[1]

Since that first trial, additional small pilot studies have examined AIP specifically in Hashimoto's thyroiditis, rheumatoid arthritis, and psoriasis, building a modest but genuinely growing evidence base, even though the overall body of research remains preliminary and considerably smaller in scale than what exists for more established therapeutic diets covered elsewhere in this same series of articles focused on managing specific health conditions through food.

Nutritional Principles and Macronutrient Breakdown

AIP unfolds across three phases rather than one fixed macronutrient target: a strict elimination phase lasting 30 to 90 days, a systematic reintroduction phase that adds foods back one at a time over five to seven days each, and an ongoing, personalized maintenance phase shaped by what each individual learns about their own specific triggers during the reintroduction process itself.

Foods that are recommended or emphasized

Foods reintroduced gradually, in a staged order

Foods excluded during the strict elimination phase

• Non-nightshade vegetables, quality meat, and fish
• Some fruit, in moderate amounts
• Healthy fats, including olive oil, coconut oil, and avocado
• Bone broth, often included as a specifically recommended staple
• Egg yolks and legume pods first, followed later by egg whites, nuts, seeds, and other foods generally better tolerated once initial symptom improvement has been clearly confirmed
• Grains, legumes, dairy, refined sugar, and food chemical additives, the standard Paleo exclusions
• Nightshades, including tomatoes, peppers, eggplant, and white potatoes
• Eggs, nuts, seeds, and alcohol

Physiological and Metabolic Mechanism

AIP's design rests on the intestinal permeability hypothesis, often called leaky gut, which proposes that certain foods disrupt the tight junctions between intestinal cells, allowing undigested food particles and bacterial components to cross into the bloodstream and trigger an exaggerated immune response in people who are genetically predisposed to autoimmune disease in the first place.

Intestinal permeability itself is a real, measurable physiological phenomenon with legitimate scientific support, but its role as a sweeping, unifying explanation across every autoimmune and chronic condition it gets applied to is considerably less established than its role in a narrower set of conditions like celiac disease and inflammatory bowel disease specifically. Experts reviewing the broader leaky gut claims have cautioned against both overstating and dismissing the underlying science, since barrier dysfunction appears to be a genuine, clinically relevant process in some conditions and a much weaker, merely associative one in others entirely.^[4]

The elimination phase is specifically designed to remove foods theorized to disrupt this intestinal barrier or provoke immune activation directly, grains and legumes through compounds like lectins, nightshades through alkaloids, dairy through certain proteins, while simultaneously emphasizing nutrient dense whole foods intended to support gut healing and reduce overall inflammatory load during the same window of time.

This dual approach, removing suspected triggers while simultaneously flooding the diet with nutrient density, distinguishes AIP's stated rationale from a simple restriction diet, since proponents frame the protocol as actively supportive of gut healing rather than purely subtractive in what it asks a person to give up during the strictest, most demanding early phase of the process.

Proven Health and Medical Benefits

The first formal pilot study, published in 2017, followed 15 patients with active Crohn's disease or ulcerative colitis through a six week transition to AIP followed by five weeks of maintenance under close clinical monitoring. Eleven of the fifteen participants, 73 percent, achieved clinical remission by week six and sustained it throughout the maintenance phase, a striking result for a purely dietary intervention, though the study's small size and lack of a control group limit how confidently its findings generalize to a broader population of patients with similar conditions.^[1]

A separate pilot study published in 2019 followed 17 women with Hashimoto's thyroiditis through a ten week AIP based intervention combined with structured health coaching, finding significant improvement in symptom burden and quality of life scores by the end of the study period, alongside measurable changes in some inflammatory markers tracked consistently throughout the intervention itself.^[2]

These findings are genuinely encouraging, but the overall evidence base remains preliminary: most published studies are small, single arm pilot designs without randomized controls, meaning the specific contribution of the diet itself, as opposed to the added attention, coaching, and expectation effects that come with any structured intervention, has not yet been cleanly isolated from these other, quite plausible contributing factors.

Clinicians most often consider AIP for people with a diagnosed autoimmune condition who have not achieved adequate symptom control through standard medical treatment alone, generally recommending it as a complement to, rather than a replacement for, ongoing medical management under the close supervision of their treating physician throughout the process.

The personalized nature of the reintroduction phase offers a genuine structural advantage over less individualized elimination diets, since it is specifically designed to identify each person's own particular triggers rather than assuming a single, universal food list applies equally well to every patient regardless of their specific condition, history, or genetic background.

Drawbacks, Health Risks, and Criticism

The leaky gut theory underlying AIP's entire design is more contested than proponents sometimes present it, particularly when used as a single, unifying explanation across a wide range of unrelated autoimmune conditions rather than the narrower, condition specific role the current evidence more clearly supports for a smaller subset of well studied diseases.^[4]

Eliminating grains, legumes, dairy, nightshades, eggs, nuts, and seeds simultaneously removes several major food groups at once, a genuinely restrictive combination that raises real questions about calcium, vitamin D, fiber, and other micronutrient adequacy if not carefully planned, making medical and dietitian oversight important rather than optional for anyone attempting the full elimination phase as originally written and intended by its creators.

The current evidence base remains small and preliminary: published pilot studies typically involve fifteen to twenty participants without control groups, a scale that supports genuine optimism but falls well short of the larger, controlled trials needed to confirm the diet's specific effect with real confidence rather than relying on early, promising signals from a handful of small studies alone.

Eliminating this many food categories at once for weeks at a time carries a real psychological burden and a documented risk of contributing to disordered eating patterns in people already prone to them, a concern worth taking seriously alongside the diet's physical considerations rather than treating it as a secondary or minor issue relative to nutrient adequacy alone.

Social and practical adherence challenges compound these concerns further, since navigating restaurants, travel, and shared meals with this many simultaneous exclusions requires considerably more planning and explanation than most other diets covered in this series, a burden that falls disproportionately on the person already managing a demanding chronic illness day to day.

Environmental, Economic, and Cultural Aspects

Like the Paleo diet it builds directly on, AIP's emphasis on quality meat and fish alongside extensive fresh produce likely carries a higher environmental footprint than a more plant centered eating pattern, consistent with food emissions research that consistently ranks meat among the highest impact food categories measured, whether assessed by land use, water use, or greenhouse gas output.^[5]

Economically, sourcing quality meat, often recommended as grass-fed or pasture-raised specifically, alongside the wide variety of fresh produce the elimination phase requires, tends to raise grocery costs meaningfully above a typical baseline diet, and bone broth or other AIP branded specialty products add further expense for anyone who chooses that particular route instead of preparing everything from ordinary, widely available grocery staples found in most stores.

A Day in This Diet

• Breakfast: sweet potato hash with sauteed greens and avocado.
• Lunch: a large salad with grilled chicken, cucumber, and an olive oil dressing.
• Snack: carrot sticks, or a cup of bone broth.
• Dinner: baked salmon with roasted non-nightshade vegetables.
• Dessert: fresh berries, or a small portion of coconut based treat.

Who It's Best Suited For — and Who Should Use Caution

Best suited for people with a diagnosed autoimmune condition who have not achieved adequate symptom control through standard medical treatment alone and remain interested in a structured, closely monitored dietary trial alongside their existing care plan.

Caution applies to anyone considering AIP without medical supervision, given the combined elimination of several major food groups and the real risk of nutrient deficiency if the diet is not carefully planned. A doctor or registered dietitian should be involved throughout, and anyone with a history of disordered eating should approach the elimination phase with particular care.

Related Diets

Closely related to Paleo, the broader eating pattern it builds on, and worth comparing with Low FODMAP, another structured elimination approach used for digestive symptoms with a somewhat larger clinical evidence base behind it.

Compare AIP to similar diets: Anti-Inflammatory and Autoimmune →