I have a 10 year old Himalayan cat. She has always been a really picky eater and is just too skinny. Been feeding her dry Iams that was what she seemed to eat best. She got tired of that and tried can...
You know more than anyone what your cat might like.
If you have suddenly decided that your finicky "always has been thin" cat is looking "too thin" then you need to get her checked now. Waiting until she stops eating to see a vet is too late.