It depends Steve. Whole food items are great as well as rodents. But none will work well when the monitor is kept in subnormal conditions.
There are two basic considerations. First, monitors are reptiles and reptiles do not have one temperature, like mammals. So they use different temps to accomplish different tasks. Overall reptiles, and monitors are reptiles, conserve energy and expend energy. To do this, they use heat. In order to conserve, they use lower temps, to expend, they use higher temps. Of course there are other basic considerations, like humidity, if thats not suitable, they will not make proper choices.
When you understand that, you then understand if your monitor does not have the ability to expend energy, the richer(high energy) foods will cause a failure faster then low energy foods. But the food is not the problem. Its the conditions as the monitor will fail in due time, no matter which food is consumed.
The key is to fix the problem not change the quality of the food. Now, how simple and logical is that? The reality is, a heathy monitor can eat doorknobs for darn sake.
Second, the people who fail, surely have to blame something. And surely they are not going to blame themselves. So they blame rodents, or anything but themselves. Truth is, whatever happens in captivity is the keepers fault, period. As the keeper took away the kepts choices.
Thirdly(is that a word)OK, third, is about research, when most research, they research people, as in what people think. That has proven to rarely be about the subject, in this case monitors. In most cases, its about the keepers restrictions, as in, my wife said, no more cages(so I put it in a box in the corner), or do not use too much electrity(so I used a 25w bulb), or the cage has to fit thru the door(the closet door). Or she said, I hate roaches(in my case) or I don't own a saw. Or other such things as, what you mean dirt, dirt is dirty. Or what about bacteria, while not realizing they themselves are one giant ball of festering bacteria. hahahahahahahaha But rarely about the needs of the caged(the monitors). The problem is, they never mention the real restrictions, they only mention the results of them. As in, monitors will die for this or that reason. Of course they will, but not for the reason they said. So, rodents are great and not the problem. The problem is the conditions the monitors are kept in. FR