Cats have a natural distrust of new foods, so don't take it personally if yours snub healthy food at first. Take a step back, and look critically at just why your cats don't seem to care that you almost dislocated your shoulder wielding a cleaver/hatchet to chop meat and/or built up muscles like Popeye stirring meat and what not for them. Bottom line with cats there are 3 practical reasons for lack of acceptance aside from general suspicion related to change:

While still not enough is known at this time about a cat's exact nutritional requirements (such as the exact ideal ratio of Omega 3 fatty acids to Omega 6), this much we do know - they have always been, and continue to be obligate carnivores with carbohydrate requirement of no more than 5%.