Explaining why people do not have an immune response to food
The immune system in humans has evolved to generate various responses meant to render harmless foreign elements that have made their way inside the body. The researchers fed the different types of foods to the test mice for a week and then measured their immune response. The researchers suggest their experiments show that the reason T cells do not attack food is that exposure to food antigens by naïve T cells leads to the development of T cell subsets that are not able to instigate inflammatory functions but are still able to produce T cells that suppress inflammation.

Source: https://www.nature.com/articles/s41586-022-04916-6