My cat is wild about "cat treats" like Temptations.
What is in that stuff that makes it so attractive?
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I would guess that it's some combination of being high in protein, high in fats (cats are as tuned to seek high-energy-source foods as we are, but it's claimed that they don't much notice sugar), having an interesting texture (consider potato chips as an equivalent), having a smell thst they can recognize and anticipate from a greater distance... My previous cat's favorite treat was dried anchovies, which would hit several of those points.
It's a well covered secret. Only those reading the Ingredients section of a product are asked to know. :)
Fun aside, it's really hard or impossible to tell, since it really depends on the actual product. Some might use catnip, buy it could really be as simple as being the overall composition (like kind of meat).
Just think of yourself: You might enjoy something as simple as vanilla pudding, even though there's no special ingredient in there. At the same time you could hate some cake with vanilla creme.
Well most products for humans are already "enhanced" with all sorts of questionable artificial additives, there's obviously even less regulation for pet food. Don't be fooled by the engredient section as another poster suggested, many additives do not have to be declared, e.g. flavor/appetite enhancing enzymes like "Protamex" or "Novo Pro D".