Cats are fussy eaters - prone to turn-up their furry noses at even sachet-treats of expensive, exotically flavoured food (beef and liver, poultry and lamb... mmm!). What a waste!
So, why don't cat food manufacturers actually make (or, at least flavour) their product with the things cats actually like to eat? Mice, spiders, pigeons, grass, bluebottles, mashed banana, little bits of debris lying on the floor?
The problem is that the makers are trying to appeal to humans - not to cats; on the basis of "who actually buys the stuff?" So we get claims the food contains the kind of meat that people enjoy.
A deeper consideration reveals that the proper question to ask is: "But who controls the purse-strings in a cat-inhabited house?"
That query has a very different answer.