From Bowl to Bladder: How Raw Feeding Supports Cat Kidney Health

Cats are strict carnivores, evolved to thrive on small prey: high in protein, moderate in fat, minimal in carbohydrates, and crucially, rich in moisture. Yet many domestic cats are fed dry kibble diets loaded with 35–50% carbohydrates and plant proteins they cannot efficiently digest. Low-moisture diets can lead to chronic dehydration, contributing to urinary tract issues, kidney disease, diabetes, and other long-term health problems.

Why Moisture is Essential

Urinary Tract Health

Feline Lower Urinary Tract Disease (FLUTD) is a common diagnosis. Concentrated urine from dehydration can irritate the bladder wall, cause crystals or stones, and, in male cats, potentially life-threatening blockages. Raw diets naturally provide high moisture, supporting healthy urine flow and maintaining the ideal urinary pH (6–6.5), reducing the risk of crystal formation.

Kidney Support

Chronic kidney disease (CKD) affects around 30% of cats over 15 years old. Inorganic phosphorus in processed foods can overwhelm the kidneys, whereas naturally occurring phosphorus in raw diets is absorbed and regulated efficiently. A well-planned raw diet also provides optimal protein, essential fatty acids, and a balanced calcium-to-phosphorus ratio, all supporting long-term renal health.

The Benefits of a Raw, High-Moisture Diet

• Hydration: High water content naturally hydrates the urinary system.

• Blood Sugar & Weight: Protein-rich, low-carb diets prevent glucose spikes, supporting pancreas health and maintaining lean muscle.

• Digestive Health: Minimal plant fiber avoids additional dehydration and supports gut integrity.

• Nutrient Bioavailability: Natural sources of vitamins and minerals are more effectively absorbed than synthetic additives in processed foods.

Evidence-Based Insights

Research shows that meat-based, species-appropriate diets better align with feline physiology than high-carb, plant-heavy processed diets. Benefits include reduced risk of obesity, diabetes, urinary issues, and chronic kidney disease (Raubenheimer et al., 2016; Hendriks et al., 1997; Davies et al., 2017). Cats on well-planned raw diets often demonstrate improved hydration, more stable kidney function, and fewer urinary complications.

Transitioning Safely to Raw

Cats with chronic conditions require a careful, individualized transition. Raw Essentials recommends:

• Offering a variety of prey sources weekly (meat, organs, bones, tripe).

• Using high-quality, NZ-sourced, human-grade or wild meat.

• Consulting with veterinarians before switching cats with health issues.

Preventive Nutrition: Hydration Through Food

Cats naturally obtain most of their water from their food. Feeding high-moisture, raw diets supports gut, urinary, and kidney health while maintaining lean body mass. Early adoption can prevent chronic disease and promote a longer, healthier life.

Success Story: Phoenix

"Phoenix came into my life as a rescue cat with ongoing urinary tract issues. After multiple relapses and emergency vet visits, I discovered Raw Essentials. The team helped me find a natural diet that suited him. Over a year later, Phoenix has had no relapses, stays healthy, and is thriving – it’s life-changing for both of us!" — Kylie, Phoenix’s human

Conclusion

Hydration isn’t just about water bowls—it’s about feeding cats the food they are designed to eat. High-moisture raw diets align with feline biology, supporting urinary, kidney, and digestive health while preventing chronic conditions. For cats with existing health issues, a carefully planned transition under veterinary guidance can make all the difference.

References:

• Raubenheimer D, Machovsky-Capuska GE, et al., Australian Veterinary Journal, 2016.

• Hendriks WH, Tarttelin MF, Proc Nutr Soc NZ, 1997.

• Davies M, Alborough R, et al., Sci Rep, 2017.

• Gosper EC, Raubenheimer D, et al., Australian Veterinary Journal, 2016.

• Craig JM, Journal of Small Animal Practice, 2021.