Fresh veg that has only been minimally processed – simply cut, cleaned, packaged or otherwise prepared for your convenience – is gluten free.
Processed vegetables – veg that has been further altered from its natural state, such as by cooking, canning, dehydrating or mixing – require more caution. Manufacturers add all sorts of ingredients to processed foods for many different reasons. These can include preservatives to increase shelf life, flavourings to improve taste, and nutrients to boost nutritional value (processing can remove vitamins, fibre and other beneficial substances), not to mention salt, sugar and fat. While many of these additions will be gluten free, some may not.