Why Does the Body Decide Some Foods Are Safe?
Researchers have made a significant discovery about how our bodies distinguish between safe and unsafe foods. A study conducted by scientists at Stanford University and the Salk Institute identified three proteins that play a key role in this decision-making process.
When you enjoy food, like a cookie or ice cream, your body performs a biological feat. It accepts those foods as safe, a process known as oral tolerance. But how does this happen? The study found that specific proteins from soybean, corn, and wheat tell our gut’s immune cells that these foods can be tolerated.
Led by Jamie Blum, now at the Salk Institute, the research shows how specialized immune cells called regulatory T cells interact with these proteins. This understanding could lead to new treatments for food allergies. “We’re uncovering the immune system’s normal processes, which could lead to new therapies for allergies,” Blum explains.
About 6% of kids and 3% to 4% of adults have food allergies. Most of these reactions come from our immune systems misreading safe proteins as harmful, which causes discomfort and can be life-threatening. Previous studies have identified proteins causing these reactions, but this new research shines a light on what helps the immune system accept certain proteins.
The researchers began their work by examining mice that ate regular diets. They identified the protein segments, called epitopes, recognized by regulatory T cells. They found that these proteins come from staple foods we commonly eat.
This could help us understand cross-tolerance, where the body tolerates one food due to the tolerance of another. Interestingly, the corn epitope was the most recognized—likely because corn allergies are rare—while the soybean epitope could impact those with soy allergies. This discovery enriches our current understanding of how our immune system works with food.
Blum argues that understanding these processes is crucial. “Diet is how we interact with our environment. Recognizing foods as safe supports healthy nutrient absorption and can prevent allergies.” Future immunotherapies could potentially harness this knowledge to help those with food allergies, making it possible to program regulatory T cells to recognize safe foods.
As this research progresses, it will be interesting to watch how it evolves into practical solutions. In the next few years, the goal is to adapt these findings for use in humans, which could pave the way for significant advancements in allergy treatment.
For more information, you can read the full study published in Science Immunology.
