I have had cats all my life. I love them lots, but they can get spoiled just like people do. When they decide one day that a certain food is not to their liking, giving them something else is just pandering to them and teaching them how to get food they more likely will enjoy.

Unfortunately kitties are not smart enough to manage their own diets, so we have to. We cannot give them what they want, we have to give them what they need, for their long term health and well-being.

Make sure you and your vet have discussed good nutrition, and provide that, and that only. If Kitty turns up their nose at it, just wait. Hunger always prevails over fussiness. Feed cats separately as well. Make sure they are drinking as much water as they will, especially if they end up eating more kibble and less wet food.

You're a at parent, not a cat friend, unfortunately. A bit of tough love is needed. Gentle, but tough. Cats won't let themselves starve.