Veilds eat mostly feeder bugs when there younger.As they get older,(after 6 months)most Veileds start nibbling at vegitation as part of there water source.Some will even eat vegitation as there primary water source.much like they do in the wild. My suggestion is to always keep nontoxic plants in with you cham.If it starts nibbling on the leaves.Introduce some leafy treats.I have a pill-bottle w/ a little water in it.It attaches to the side of the cage with wire. I put char/kale or other leafy treats hanging out of it. Or you can also place 1/4-1/2 inch slices of melon on a stick like a kabbob.(my boys favorite).At this point the best thing you can do to vary its diet. is to offer a wide varity of feeders and a even wider varity of gutloads.