I sure wish I were a cat-savant and understood them...
We used to feed them Pro-plan dry and one can of wet.
Fast forward when we moved out here and the prices kept climbing up, up and UP...I researched cat food to death.
I knew that most foods have some carbs in them because they (mfg) claim it is the only way to extrude and keep the kibble together. I just never realized HOW MUCH carbs went into some foods; even some canned foods are horrible at the carb content.
Cats especially are OBLIGATE carnivores. My one cat was getting fatter and fatter...he is also the one that pukes the most.
We used the no grain Costco dry, which they liked...and then one day..POOF, costco discontinued it.
EVO kibble and canned is the lowest carb food on the market for cats that I can find. Some foods claim "no grain" but they dump in potatoes and other stuff, so I have started to look at the carb count.
EVO was bought out by P&G (same mfg. of Iams) and claim no formula has been altered or changed.
All my cats will eat EVO. I also have some Nature's Variety Instinct, for variety, even though it is 18% carbs vs. 11% for the EVO. I cannot find anything lower.
Sadly, all this food change has been a double-edged sword.
They used to love their canned food, but with the intro of new canned, they are very finicky and I have tossed out too many cans to count (I have donated CASES of cat food since they turned up their noses on so much stuff).
On the good side, my fat-boy has lost a great deal of weight. Is it because he doesn't like his food? or because he is much more satisfied on the lower carb stuff and doesn't get the glucose spikes (similar to people), so he is just less hungry. Wish they could talk.
In any event, I noticed their bowels and litter box change quite dramatically from going to the new food, but that happens with all new food, good or bad.
All of my cats have puked with no relation to the food. I sometimes wonder if there is a cat virus or something that spreads in the household...they all have a turn at it, but they don't look or act sick. Since mine are indoor/outdoor, especially in the spring/summer, I never know what they have eaten outdoors, unless, like STripey, he brings it indoors and leaves the bloody entrails on my white runner rug in the hallway .
I have read a lot of sites (even written by vets) that claim science diet is the worst, but then my 22 year old wally-cat lived to 22 living on the canned stuff (and outdoor catches) his whole life.
Some sites say only feed them canned, but what to do if they don't like what you give them....ugh.
There are days I wish cats were more like dogs....if it doesn't move, eat it.
Thoreau said, 'A man is rich in proportion to the things he can leave alone.'