Intestinal permeability refers to the ability of substances, such as nutrients and other molecules, to pass through the lining of the small intestine. This process is essential for the absorption of necessary nutrients into the bloodstream from food that has been consumed. Intestinal permeability can be affected by various factors including diet, stress, infections or inflammation, and exposure to environmental toxins. When intestinal permeability is compromised, it may result in a condition known as leaky gut syndrome, where undigested food particles and other substances are able to enter the bloodstream, potentially causing an immune response and contributing to various health issues such as inflammation, autoimmune disorders, and chronic diseases.