The panther chameleon care sheets here on the forums is so full of good information! It mentions that panthers lives from 5 to 7 years on average. If you just mathematically convert that to human years assuming a human life span of 70 years then every year for a panther chameleon is like 10 to 14 years! So, logically speaking, for a panther every day counts! Every meal counts! Every bug counts! In the span of a year I use over 200 different kinds of chameleon safe foods for gutloading! Nearly all organic items too! As for bugs, two or three different kinds of bugs is just not enough! In nature chameleons has a endless supply of hundreds of different kinds of bugs.
Here is a couple of screen shots from the panther chameleon care sheet from chameleonforums.com
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Sure hope this helps!