Bearded dragon not eating.?

My bearded dragon is 6 years old. Over a period of 3 months he lost his appetite. I had him de-wormed a few times, but still no appetite. I feed him grated carrots, baby marrows and a herb mix. I also feed him a dry feed pelleted diet. He gets fresh food and water daily. The only thing he will eat is crickets, but he gets only 2 a day. Help Please!