Cats aren't even supposed to be able to taste sugar. However they do go nuts for fat (hence many will go nuts for plain doughnut, potato chips, or cheese).
Chances are kitty's favorite is high in
fat, and while the engineered food is probably a hell of a lot more nutritious than a scrawny mouse and the occasional earthworm or sparrow, that's also the problem -- watch out for the 'balloon' effect and things'll probably be okay.
(Whiskas with the 'savory nuggets' is a particularly bad offender, since guess what's making the filled bits so 'savory?' I've seen multiple folks' cats get halfway to
Tubcat on the stuff; unless you're willing to feed only once a day -- and show willpower as kitty whines and moans in hunger -- moving to the 'cheap stuff' with more roughage and less fat often works better. Or wet food, if you can stand the reek; that's mostly water, and the fat in the dry food may be substituting for moisture, same as we butter toast or slap mayo on a sandwich so it 'won't be dry.')
