Explained in plain English

What is gluten?

Gluten is a group of proteins found in grains like wheat, barley, and rye. It acts like a glue, giving dough its elasticity and bread its chewy texture. For most people, it's harmless, but for those with coeliac disease or gluten sensitivity, it can cause digestive issues and other health problems, which is why Matt Damon's diet change might have felt significant.