Jods; I have post this morning but I can't see it now.

It would be very helpfull if you give detail how she/he lives, temperature, humidity, food,UVB lights, ect...Also if it is a girl or a boy. If she is bright green with some orange, could be that she/he is in season.
Right now, Magda, in my siggy, is full of eggs, about 25 or 30 from we can see from the x-ray the vet took.And he doesn't eat much either, because the eggs don't let place for food in her stomach wich is normal.

You should check

www.iguanaden.com

also, Melissa Kaplan website, wich I don't remember by memory, you can google for it.

A trip to the vet is in order, ill or in season, to see what is causing him/her not to eat. Even if is not an especialist in exotics, should be able to take a x-ray and "read " it, right? And se what is causing it's lots of appetite.

I'm still at work, will check later when at home. I'm willing to help.
There are other members in PT that own iguanas too. Fox-Gal, and Greencamaleongirl and CampCamp3 I think have iguanas too.