A test for intolerance will determine if an individual has some adverse effects when he consumes gluten. This is a condition also known as gluten insensitivity (GS), and there are many people around the world who are affected by it. Gluten is a protein contained in 4 types of grains―wheat, rye, barley, and spelled (a kind of wheat)―so it is impossible to completely avoid its consumption. But by carrying out this test, one can at least determine if he/she is sensitive to it.