I read something on this subject once. After I understood that there is no difference to just feeding them, and trying to pack extra stuff right before they are fed off.
The idea being that the insects eat a diet that would pass through the lizards system and make no benefit, so without the insect digesting it, and making use of it, the food is of no benefit.
"Gut loading" is a commercial term used to sell a product that cost alot more than other insect food products.
Ive had crickets and roaches breed in cages, and in colonies. Both would be offered a cheap diet (those in the cages were fed little or nothing, but they cleaned the cages for me), the crickets living in the cages would not go away, these crickets were the healthiest, and fastest, yet not very big.
When I see the term "gut loading", its like when I see or hear the term "power feeding" I realize that this person heard or read this in a source that is better left alone.
Simply put, the crickets do better if they eat, rather than starve.

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