This is some newer information I recently received updating feeding of the green iguana. Again, this just shows the changes that are occurring regarding care of iguanas. The natural diet of the green iguana consists of leaves, flowers, and fruits. A correct diet is as followed. Any kind of meat is not real food for an iguana.
Chows are a commercial food formulated for other species.
These are high in protein, vitamin D, and fat. Iguanas often grow very quickly when given too much protein, but their life span is considerably shorter. It is not uncommon for iguanas to live in excess of 15 years. The Ultimate Owner's Manual. Older iguanas should be fed 2-3 times per week and can be offered the same items as listed above.