Its your choice to do with your monitor as you choose..
As well your choice to believe whats written in "Giant Lizards" which is by far the worst "petstore monitor book" ever written on captive care, also to be followed by Spacklands other book "Savannah and grassland monitors", note something that tells you about Mr. Spackland and his captive care , he cant keep any monitors alive from one book to the next, why is that? If you like that book, then by all means keep it for the pretty pictures, thats all its good for.
Diet, substrate, lighting, etc are all a part of basic care, basic care as proven many many many times in the past 15 years with monitors in captivity has been demonstrated consistantly. Whole animals as a basis for a diet in monitors is the only proven diet, as well the best diet you can give them, it has all of the needed calcium, minerals, vitamins, non-soluable fiber, etc that they need to accomplish all life events. That basic whole animals diet has been proven by the only people who breed monitors, why is it that people who base their monitors diet off of rodents (except odatria) are the only people who gave monitors breeding sucessfully in captivity? Why is it that the oldest, largest, and multiclutching monitors are fed a diet based off of rodents (except odatria)?
You just have to consider the facts, you dont need to answer the questions here, I already know the answers. These are proven facts, not opinions such as the choice so many make for their own personal preferences and feelings, not knowledge, or experience to feed dogfood, catfood, peoplefood, or canned monitor food which has no laws covering it as far as ingredients, because it states "not for human consumption" they can tell you anything they want to for ingredients. It could have raw heat extruded sewage, and the law doesnt cover it.
Ill stick to what works, what doesnt give them a runny stool, what has been proven to do the best for them. Of course I also have 14 years of experience with monitors, and over 20 with reptiles to tell me what happens when you keep them wrong.
Its your choice, there are alot of inexpensive, imported monitors for now available to replace yours with for following R.G.Sparacklands advice, a million others have followed it to, look where it got them. This is why 16,000 nile monitors are imported every year to the pet trade alone, also 25,000 plus bosc monitors a year to the US for the pet trade alone (these figures dont cover for the skin trade, its higher yet). You can check these figures with CITES, and with the US customs, they publish them every year. This is just 2 commonly kept species, not including the water monitor, etc etc.
Ive used canned monitor food in the past, several brands, the best one was Zupreem, but thats not saying much, most monitors unless very hungry wont eat that crap.
Have a nice day.