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Autoimmune Protocol (AIP) Diet: What Does Science Say?
The Autoimmune Protocol (AIP) diet has gained increasing attention as autoimmune diseases become more common. While medical management mainly relies on treatments aimed at modulating or suppressing immune system activity, many people seek complementary approaches, particularly through diet.
The AIP diet is often presented as a way to reduce inflammation, improve symptoms, and sometimes even “heal” the gut or rebalance the immune system. But what does the evidence actually say? And why do many people report feeling better when they adopt this diet?
Autoimmune Diseases and Diet
Autoimmune diseases are conditions in which the immune system mistakenly attacks the body’s own tissues, such as rheumatoid arthritis, multiple sclerosis, inflammatory bowel diseases, Hashimoto’s thyroiditis, and type 1 diabetes. Their increasing prevalence cannot be explained by genetics alone. While genetic predisposition plays a role, environmental factors—including infections, stress, sleep, exposure to certain compounds, and diet—are increasingly recognized as triggers or modulators of autoimmune responses in predisposed individuals.
Diet is of particular interest because some evidence suggests that Western-style dietary patterns, rich in processed foods, may promote inflammatory responses and disrupt the gut microbiota. Diet may also influence the integrity of the intestinal barrier, the intake of essential micronutrients, and low-grade inflammation. This helps explain the growing interest in dietary approaches such as the AIP diet.
Origin of the Autoimmune Protocol Diet
The AIP diet has its roots in the Paleo diet and is based on the idea that certain modern foods may contribute to metabolic and inflammatory imbalances. It was structured and popularized in the 2010s, mainly through books and educational platforms aimed at the general public, including The Paleo Approach by Dr. Sarah Ballantyne, PhD in biophysics. The AIP diet does not stem from official clinical recommendations or guidelines issued by scientific societies. Rather, it represents an attempt to translate certain scientific hypotheses — particularly those related to inflammation, immunity, and gut health — into a practical dietary protocol.
It is essentially a stricter version of the Paleo diet designed for people living with autoimmune diseases. The protocol aims to minimize exposure to potential dietary antigens that could trigger an autoimmune response. It is based on the hypothesis that increased intestinal permeability (often referred to as “leaky gut”) and imbalances in the gut microbiota, combined with genetic susceptibility, may trigger or worsen autoimmune responses.
As a result, the AIP diet promotes an individualized dietary pattern based on each person’s tolerance to different foods, with the goal of limiting exposure to potentially problematic dietary triggers.
Author
Lyna is a McGill University–trained registered dietitian and has been a member of the Ordre des diététistes-nutritionnistes du Québec (ODNQ) since 2020. Through several years of varied clinical experience, she has developed a strong interest in science-based nutrition that is meant to be understood and applied in everyday life. Always with her glass of mint tea, she enjoys making complex nutrition concepts clear, practical, and accessible. She is particularly interested in the development of tools and projects with a broad positive impact, supporting informed and sustainable food choices.
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