Frank R. and dave46 posts both make sense to me; they both clearly say that the total ammount of energy fed should be in relation to the total ammount of energy used..
Most varanids in captivity as adults (especially kept singly, and male), use little energy, so need a proportionately smaller ammount of food.
And as far as Spracklands book (Giant Lizards, 1992 edition), and the photo cited; he (Sprackland), clearly wasn`t concerned with that monitor`s obesity, at least according to his broad grin...
I expect that animal would have difficulty even walking!
That`s a perfect example of too much, too often, and I took it both Frank and Dave were referring to this in both the question and the answer?
A properly supported Varanid in captivity should not become obese, or die long before it`s life expectancy potential.

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