Kidney issues are fairly common in cats, especially feline chronic kidney disease (CKD), which impacts the cat’s kidney function and lifespan. The good news is that this condition can be managed with a personalized treatment plan, which typically includes a special therapeutic diet (i.e., low-phosphorus cat food).
There are a variety of low-phosphorus cat foods or ‘kidney cat food’ to choose from. This Sploot Vets guide provides examples of some of the best ones, as a starting point reference for your discussion with your veterinarian.
Who Needs Low-Phosphorus Cat Food or ‘Kidney Cat Food’?
‘Kidney cat food’ or low-phosphorus cat food is formulated to support chronic kidney disease (CKD) and kidney impairment secondary to polycystic kidney disease (PKD).
- CKD in cats is a term used to describe persistent renal impairment. It is more common in older cats, affecting up to 40 percent of cats over 10 years of age. Other factors like previous kidney infections, inflammation, kidney stones, toxin exposure, and high blood pressure also increase the risk of CKD in cats.
- PKD in cats is a form of kidney disease caused by genetic factors, commonly diagnosed in Persian cats and Persian-related breeds (e.g., Himalayans, British Shorthairs, Exotic Shorthairs). It leads to the formation of fluid-filled cysts in the renal cortex, which damage healthy kidney tissue.
Note: Both chronic kidney disease and polycystic disease in cats can lead to impaired kidney function and produce the following symptoms: increased thirst, increased urination, vomiting, weight loss in cats, and reduced appetite in cats.
How Low-Phosphorus Cat Food Supports Kidney Health
Cats with kidney disease can no longer effectively remove or filter out phosphorus, leading to excess levels of phosphorus in the blood (‘hyperphosphatemia’), which causes the following:
- An unhealthy release of calcium from the bones – this happens as the body tries to balance out high phosphorus levels
- Destruction of remaining healthy kidney tissue – via soft tissue calcification when calcium levels in the blood increase.
- Toxic build-up of phosphorus – produces symptoms like vomiting in cats, lethargy, and reduced appetite in cats.
By restricting phosphorus, foods for cats with kidney disease can help slow down the progression of the disease, preserve the remaining healthy kidney tissue, and reduce symptoms. This is why low-phosphorus diets are a cornerstone of feline kidney disease treatment.
Note: Low-phosphorus cat foods are primarily used to manage (not prevent) kidney disease. To support kidney health preventatively, ask a veterinarian about boosting hydration, beneficial cat supplements, annual pet wellness exams, and reducing toxin exposure.
5+ Best Low Phosphorus Cat Food for CKD & PKD in Cats
‘Low-phosphorus cat food’ is a categorical term for cat food typically prescribed for CKD or PKD in cats. Being low in phosphorus is not the only key feature in these formulas. As you will see in the examples below, cat foods low in phosphorus also tend to have optimized protein levels, omega-3 or fish oil, and antioxidants—all of which help support kidney health.
→ The best low-phosphorus cat food for your cat is the one prescribed by a licensed veterinarian, taking into account your cat’s individual health needs. Schedule a vet visit at Sploot Vets today and experience next-level feline care with personalized nutritional guidance.
1. Royal Canin Adult Renal Support – Thin Slices in Gravy [Wet Cat Food]
- Phosphorus level: max 0.14 percent – see “Guaranteed Analysis” of the product for formula updates.
- Available on the SplootRX online pet store. Get 35% off (up to $20) on your first order with the promo code AUTO35.
Royal Canin’s Adult Renal Support is a low-phosphorus wet cat food line with two flavor profiles labeled as D and T, wherein D stands for ‘Delectable’ and T stands for ‘Tasty’. One small difference is that the T-formula contains salmon in the ingredient list, which affects its flavor profile.
Aside from low phosphorus content, these energy-dense formulas also feature targeted protein levels to reduce kidney strain—as well as fatty acids from fish oil to manage inflammation. Lastly, both formulas offer a precise antioxidant combination, which includes vitamins C and E.
Note: Energy-dense wet cat foods have an adapted level of energy content per gram, which can help compensate for decreased appetites in cats with kidney disease.
2. Royal Canin Adult Renal Support S [Dry Cat Food]
- Phosphorus level: max 0.57 percent – see “Guaranteed Analysis” of the product for formula updates.
- Available on the SplootRX online pet store. Get 35% off (up to $20) on your first order with the promo code AUTO35.
Royal Canin Adult Renal Support S is a dry food for cats with kidney disease, with a flavor profile labeled S for ‘Savory’, which helps stimulate the cat’s appetite. It is formulated to promote kidney function with targeted protein levels to reduce kidney strain, fatty acids from fish oil for anti-inflammatory effects, and antioxidants for overall health.
A few additional benefits of this dry cat food formula, which sets it apart from its wet food counterparts, include additional fibers for satiety and digestive health and a rough texture that offers dental benefits.
Note: Veterinarians may recommend mixed feeding, using both dry food and wet food, so that your cat can get the health benefits of both.
3. Purina Pro Plan NF Kidney Function® Advanced Care [Wet Cat Food]
- Phosphorus level: max 0.12 percent – see “Guaranteed Analysis” of the product for formula updates.
- Available on the SplootRX online pet store. Get 35% off (up to $20) on your first order with the promo code AUTO35.
Purina Pro Plan NF Kidney Function is a low-phosphorus wet cat food with one of the lowest percentages of phosphorus on this list. It also offers reduced protein levels, as well as omega-3 fatty acids and the antioxidant vitamin E. These are all key features found in food for cats with kidney disease to reduce kidney strain, manage inflammation, and promote cellular wellness, respectively.
Additionally, the ingredient list of this cat food contains inulin, a prebiotic fiber to balance the gut’s microbiome, and insoluble fiber for satiety and digestive health.
4. Purina Pro Plan NF Kidney Function® Advanced Care Feline Formula [Dry Cat Food]
- Phosphorus level: max 0.44 percent – see “Guaranteed Analysis” of the product for formula updates.
- Available on the SplootRX online pet store. Get 35% off (up to $20) on your first order with the promo code AUTO35.
Purina Pro Plan NF Kidney Function also features a low-phosphorus dry cat food variant. This formula has tuna as its main animal protein source, along with plant-based proteins to help manage the phosphorus-protein ratio. Similar to other cat foods on this list, this formula also contains omega-3 fatty acids and antioxidant vitamin E for controlling inflammation and overall health.
In addition, since this is a dry cat food for kidney disease, it offers the advantages commonly associated with dry foods, such as added fiber for satiety and mechanical plaque reduction while chewing.
5. Hill's Prescription Diet k/d Kidney Care Stew [Wet Cat Food]
Hill’s Prescription Diet k/d Kidney Care Stew is a therapeutic low-phosphorus wet cat food with a delicious stew-style formula, featuring two flavors: Chicken & Vegetable and Vegetable & Tuna.
This wet cat food is formulated with controlled phosphorus and reduced protein to help lessen the workload on the kidneys. It also contains omega-3 fatty acids from fish oil and antioxidants, such as vitamins C and E, to support kidney health and help manage inflammation.
Both formulas also contain powdered cellulose, an insoluble fiber to support healthy digestion, and betaine, which supports cellular hydration.
→ Not sure which cat food to choose? Schedule a vet visit at Sploot Vets today and experience next-level feline care and personalized nutritional guidance for managing kidney disease.
Final Thoughts About Kidney Disease & Low Phosphorus Cat Food
Chronic kidney disease (CKD) and polycystic kidney disease (PKD) share several similarities. Both conditions affect the kidneys and typically have an irreversible prognosis, meaning the damage cannot be reversed once it occurs.
Note: Kidney disease in cats tends to be more noticeable during the later stages, highlighting the importance of annual pet wellness exams for early detection and treatment.
While therapeutic diets can slow down the progression of kidney disease, a broad treatment plan for feline kidney disease may also include medications to manage symptoms, regular veterinary monitoring, and fluid therapy to maintain hydration.
Sploot Vets: All-in-One, Fear Free Vet Care for Cats
Whether you are curious about preventative measures against feline kidney disease or looking for more personalized, stress-free care for your cat with CKD or PKD, we are here to help!
Sploot Veterinary Care offers all-in-one care for cats, with primary care, urgent care, and emergency vet services all under one roof. With our experienced vets, state-of-the-art facilities, and a compassionate, Fear Free veterinary approach, you can be sure that your cat is in good hands!.
Visit one of our vet clinics in Colorado Springs, Denver, Chicago, and Salt Lake City today! We are open 365 days a year with extended vet clinic hours to fit your schedule.
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