Researchers Uncover Secrets of Food Tolerance

Stanford study reveals how the immune system learns to accept common foods

Mar. 12, 2026 at 10:33am

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A new study from Stanford University has uncovered the mechanisms behind why most people can safely consume common foods like corn, soy, and wheat, while others develop dangerous allergies. The researchers found that the immune system's regulatory T cells actively recognize specific protein fragments, or epitopes, in these foods and signal that they are safe, preventing an allergic response. This discovery opens up new possibilities for developing treatments and preventative strategies to address food allergies.

Why it matters

Food allergies affect millions worldwide and can be life-threatening. Understanding the biological basis for why most people develop oral tolerance to common foods, while others do not, is crucial for advancing allergy treatments and prevention. This research provides important insights into the active process of immune system training that allows the body to accept harmless food proteins.

The details

The study, led by Stanford chemical engineering professor Elizabeth Sattely, found that regulatory T cells (Tregs) in the intestines survey the foods we eat and recognize specific protein epitopes as safe. These Tregs then signal the immune system to remain calm, preventing an allergic reaction. The researchers were able to identify key epitopes from common food proteins like corn, soy, and wheat that preferentially stimulate this tolerogenic Treg response. This suggests the immune system learns tolerance from a limited set of molecular cues, opening the door to potential therapies that could reprogram the immune system to treat or prevent food allergies.

  • The study was published in the journal Science Immunology on March 12, 2026.

The players

Elizabeth "Beth" Sattely

An associate professor of chemical engineering at the Stanford University School of Engineering and the senior author of the study.

Jamie Blum

A former postdoctoral scholar in Sattely's lab and a co-first author of the study.

Ryan Kong

A Stanford graduate student in chemical engineering and a co-first author of the study.

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What they’re saying

“We know a lot about what the immune system sees and does if a patient has an allergy, but we know very little about what happens when things go right.”

— Elizabeth Sattely, Associate Professor of Chemical Engineering (Mirage News)

“What really surprised me was how focused the mechanism is. In the case of corn, the Treg cells zero in on a single epitope that is part of a larger molecule, zein, a protein in the fleshy interior of the corn kernel. Considering the enormous number of potential intestinal antigens, it was striking to see such a targeted response.”

— Ryan Kong, Stanford Graduate Student in Chemical Engineering (Mirage News)

“One of the most exciting findings is that the development of the zein-specific T cells depends on the format of the protein in the food and the intestinal microbial community. We are now working to determine the exact biological mechanisms involved.”

— Jamie Blum, Researcher (Mirage News)

What’s next

The researchers plan to further explore the specific plant proteins and synthesize versions with the key tolerance-inducing epitopes disabled or removed to test immune responses, first in mice and eventually in humans. This knowledge could lead to the development of treatments or preventative strategies to address food allergies.

The takeaway

This groundbreaking research provides critical insights into the active process by which the immune system learns to tolerate common foods, opening up new avenues for addressing the growing problem of food allergies. By understanding the specific molecular mechanisms underlying oral tolerance, scientists may one day be able to harness this knowledge to help those with life-threatening food allergies overcome their condition.