The past decade has brought a surge of gluten-free items into the food industry, and the trend remains strong in Vermont. The demand is tied to not only those with Celiac disease, but also people who have simply decided to cut gluten out of their regular diet. Donald Billings, the owner of Roots the Restaurant in Rutland, said he’s had gluten-free foods on the restaurant’s menu “from day one,” and he said those items have been fairly popular over the five years he’s owned the business. “You have to provide for everyone,” he said. Billings changes the menu seasonally, and sometimes the gluten-free items change, sometimes they don’t.