I gather that we are talking about a central bearded dragon, these dragons belinda are usually pigs when it comes to feed, here is some surgestion take it if you want.
1. check your temperatures, 40-50 degrees in a hot spot (sounds extreme but these animals want operate at low temps properly) at the other end of the cage should be around the 28 degrees.
2. try Live food first before vegies and stuff, bearded dragon are stimulated by moving prey, (cockroaches, crickets,moths grass hoppers ect)
3. Mabe purchase another of the same species, competition for food can also stimutate feeding
message for S.Irwin person (settle belinda I am not going to bag him) its irrelevent what your real name is, its the fact that you are a herp friendly person, and that you may have question and hopefully answers about reptiles and if that is the case then a big proper welcome to you (see bel I am not all bad)