Watch Gluten-Free People Struggle To Explain What Gluten Is

Back in January, Girl Scouts of America announced that in addition to Samoas, Tagalongs and Thin Mints, they were going to offer gluten-free cookies to customers. It is part of a nationwide dietary trend to avoid gluten and foods that traditionally contain gluten like wheat bread, cookies, and pasta.

While some people need to avoid gluten for medical reasons (celiac disease, wheat allergies, etc.), others choose to do so for other health or fitness reasons. TIME labeled the gluten-free movement #2 on its top 10 list of food trends back in 2012 and, as the trend continues, restaurants and food manufacturers are eager to cash in by offering alternatives to gluten-based products. Even Dunkin Donuts — the cathedral for those of us who choose to worship the holy trinity of fat, sugar and gluten — is offering gluten-free baked goods.

But what exactly is gluten?

Hoping to answer that question, Jimmy Kimmel sent a camera crew to a park in Los Angeles to ask people who admit to choosing a gluten-free diet to ask: “What is gluten?”

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