Gluten is a protein compound in grains like wheat, barley, and rye. It is used in foods (breads, cereals, sauces, etc.) to add elasticity and texture. Only, many people cannot tolerate or are sensitive to gluten.
When you have a gluten intolerance, the immune system attacks the gluten proteins and/or the digestive tract. This causes symptoms such as bloating, constipation, diarrhea, headaches, and fatigue.