I'm sure after reading everything you have, your a bit more then confused. 
But that's ok.
An important thing, is to never take the advice of someone blindly, be it your sister, or your vet. Though sure, at times they might be right.
When selecting a diet, there are many things to consider, but past all the facts and here say, this is what it comes down to, and only you can answer these questions about your cat.
1.) Does your cat enjoy its food? (should be yes)
2.) Is your cat over weight from eating? (should be no)
3.) Does your cat have any problems stemmed from eating it's food? (should be no)
4.) Does your cat look as healthy as it could ever be? (should be yes)
If you answered the opposite to any one of these questions, then yes it's time to think about a possible food change, or feeding style. If you answered correctly to all of them, then I wouldn't worry, and continue to do the good job you have been doing.
But that's ok.
An important thing, is to never take the advice of someone blindly, be it your sister, or your vet. Though sure, at times they might be right.
When selecting a diet, there are many things to consider, but past all the facts and here say, this is what it comes down to, and only you can answer these questions about your cat.
1.) Does your cat enjoy its food? (should be yes)
2.) Is your cat over weight from eating? (should be no)
3.) Does your cat have any problems stemmed from eating it's food? (should be no)
4.) Does your cat look as healthy as it could ever be? (should be yes)
If you answered the opposite to any one of these questions, then yes it's time to think about a possible food change, or feeding style. If you answered correctly to all of them, then I wouldn't worry, and continue to do the good job you have been doing.
