Once upon a time, gluten was not part of the human diet, and therefore, there were no gluten-related disorders. With the advent of agriculture 10,000 years ago, the introduction of gluten-containing grains in the human diet created conditions for human diseases related to gluten exposure. These diseases, including celiac disease, non-celiac gluten sensitivity, and wheat allergy, have distinct pathophysiological mechanisms, serological markers, and long-term treatments, but similar, often overlapping clinical presentations. Though current research strives to clarify the boundaries between...