A few ideas. How old is your UVB light? If its been used for over 6 months you need a new one, and this might help appetite. Also, it is winter, and even if you have a set light/temp schedule for the cage chams often respond to daylight changes they sense through windows. Your house is probably a bit cooler overall too with lower humidity. This does affect the cage environment subtly and your cham may just be less hungry and a bit less active. Lower activity, less basking, lower appetite. Add some general brighter light to perk up the cage atmosphere. If you have nice weather take him outside into "real" sun. Offer food once he's active. Chams don't stop eating because they decide they hate you! Have you changed the ingredients of the gutload? If the bugs taste different the cham will notice. 3-4 days is not a long fast, so don't panic. Don't feed him for a couple of days then introduce 1-2 very active insects such as flies. If you've been feeding him every day switch to every other day (with maybe a small snack on the non-feeding day at most). Chams are intrigued by green insects so you could experiment with green food coloring or ground dried peas as a dust.

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