I've been going down a bit of a rabbit hole trying to figure out what I should be feeding my cats long-term, and I'd love to hear other people's opinions/experiences. I am specifically referring to kibble in this thread.
For years I've generally leaned toward grain-free foods because cats are obligate carnivores, and I've been feeding them Tiki Cat. However, I've recently been questioning whether avoiding grains like corn, wheat, rice, etc. actually provides a meaningful health benefit.
What has me conflicted is that some highly reputable, veterinarian-recommended foods like Hill's Science Diet contain ingredients such as corn, wheat, rice, and other grains. If grains are inherently inappropriate for cats, I'm trying to understand why foods with so much veterinary and nutritional research behind them routinely include those ingredients.
At the same time, many premium foods heavily advertise being grain-free, which is what I've historically gravitated toward. From what I've been reading, though, cats apparently can digest properly processed grains reasonably well, so I'm starting to wonder whether I've been putting too much importance on "grain-free" when evaluating a food.
The other thing I'm looking at now is phosphorus. I lost a cat to kidney disease, so kidney health is something I'm particularly concerned about with my other cats. I understand that phosphorus is an essential nutrient and that healthy cats don't need prescription renal diets, but I've been reading research suggesting that excessively high dietary phosphorus, particularly highly bioavailable inorganic phosphate sources and poorly balanced calcium to phosphorus ratios, may be undesirable for long-term kidney health.
So I'm trying to find a normal adult maintenance food that has:
• Good animal-based protein
• Reasonable/moderate phosphorus
• A sensible calcium-to-phosphorus ratio
• Ideally no unnecessary added inorganic phosphate salts
• Good manufacturer quality control/nutritional formulation
• And preferably grain-free, if being grain-free actually provides a meaningful benefit
One food I've been looking at is Nulo Indoor Duck & Cod. It's grain-free, around 40% protein with most of the protein coming from animal sources, and its published phosphorus/calcium numbers look considerably more appealing to me than some of the other premium dry foods I've looked at like Tiki Cat.
I've also been looking at foods like Hill's Science Diet, which obviously approaches formulation very differently and includes grains despite its reputation and the amount of nutritional research behind the brand.
So I'm curious:
Do you specifically avoid grains in your cats' food? If so, why? Or do you think the grain-free thing is mostly marketing as long as the overall formulation is good?
And for anyone who pays attention to kidney health/nutrition, how much attention do you pay to phosphorus levels in food for otherwise healthy adult cats?
I'm not looking for a prescription renal diet or trying to severely restrict phosphorus in healthy cats. I'm basically trying to find the best balance between good nutrition now and reducing avoidable risk factors as they get older.
I'd especially love to hear from anyone with a veterinary/nutrition background, but I'm interested in everyone's experiences.