These are the recommendations for people, not necessarily cats.
For one, fish should be avoided except for very, very small amounts - and only wild-caught, small-sized fish (like sardines) should then be fed - because they can cause quite a few problems for cats: Why Fish is Dangerous for Cats and Eight strikes against fishy feeding.
And, two, I've never seen anything to indicate an issue with beef and lamb. Cats aren't people, they're obligate carnivores who eat meat - all meat! - and don't suffer the same issues as people (who are omnivores). The key is to feed a variety of animal protein sources, not just one or two.
Dr. Peterson is a well-reknowned endocrinologist and his column makes for fascinating reading. Here are a couple that discuss protein intake: Is It Feasible for Older Cats to Ingest the Optimal Amounts of Protein They Need Each Day? and Can Increasing the Amount of Fat or Carbohydrate in a Cat's Diet Compensate for Low Protein Intake?
And please do not make rabbit a primary meat source, it should only be one among many. Cats, unlike people, *need at least 25%* fat in their diet. Rabbit is a great food - but ONLY in rotation with other meat sources.
Really, Space, the changes you've already made - getting rid of the olive oil, etc. - should be all that you need to do. I strongly recommend against putting your cat on a low-fat diet.
I see some canned food that Hercules likes also have very hight fat. (like nature's variety canned has fat content as high as 32%DM). Is there any way I can change it? Should I stop feeding those foods completely, or can I add something to reduce fat?
I see some canned food that Hercules likes also have very hight fat. (like nature's variety canned has fat content as high as 32%DM). .....
Because it should be. Again, cats are not people and need more fat in their diet than we do.
You should really stop obsessing over the food and go have the test redone properly.
Thanks for the link. I really need to know about all the actions of these fatty acids. Sometimes scientific knowledge would help me understand what to do to protect his arteries and joints. I've also been researching about when and how much cholesterol level is supposed to rise in a healthy cat, and what would cause clogged arteries or arthritis, but I haven't reached any conclusion yet. I can't open the second link for some reason.
You guys are right, I should relax about this and not stress Hercules. He probably is confused about the change and believes there was something terribly wrong, and the other two senior cats are probably confused too. They used to get anything they want at dinner, plus those fatty treats they love, and now they don't because I am too busy calculating their calorie and fat.
Yes, I'm still dying to know his fasted cholesterol level, but I don't want to stress Hercules so frequently.....
I just want to update Hercules' condition. His leg doesn't limp any more, he can walk, run, and jump normally like before. I still don't know what has caused the limp though. As I recalled, he was walking slowly in January and December, and then one day just started limping when he got up from a nap. He walked like he was 20 years old. He started to get better after I reduced his food and stopped adding oil, and now he is well! I wonder if the problem was caused by too the oil I added. I really appreciate everyone's help!!
space1101, what kind of oil had you been adding to Hercules' food, and how much / how often?
I add a small amount to my kitties home-made food, so that could be valuable info for me.
I had read on another thread that someone's kitty developed a limp and it turned out to be Mercury poisoning.
It was corrected and he is doing fine on a diet that has less seafood in it.