👉 Gluten is a type of protein found in cereals, breads, and other processed foods. It can cause allergic reactions in some people when consumed in large quantities or at high levels for extended periods of time. Glutens are proteins that are often found in gluten, which are the main ingredient in wheat flour. Gluten sensitivity refers to an individual's immune system being unable to properly handle gluten, resulting in symptoms such as food allergies and digestive issues.