Cats are notorious for their low thirst drive, which often leads to concentrated urine and a heightened risk of urinary tract issues, including calcium oxalate stones. A recent study by researchers at Munchkin sheds light on a simple yet innovative solution: increasing water viscosity.

The Study at a Glance
Twelve cats (ages 3–8 years) were monitored over four months in a crossover design. For two months, they drank water thickened to 282 centipoise (viscous), followed by two months of normal water (2.9 centipoise). Researchers measured water intake, urine specific gravity, calcium excretion, and calcium oxalate crystallization risk using a titrimetric test (COT).

Key Findings

1. Increased Water Intake: Cats consumed significantly more viscous water (79.9g vs. 65.6g; P=0.014).

2. Improved Urine Metrics:

• Lower urine specific gravity (1.042 vs. 1.052; P=0.016).
• Reduced calcium excretion (0.197 vs. 0.280; P=0.036).
• Lower urinary calcium concentration (49.8 vs. 61.8 ppm; P<0.01).

3. Reduced Stone Risk: The COT index, which predicts calcium oxalate crystallization risk, dropped by over 50% (35.5 vs. 82.4; P=0.029).

Why Does Viscosity Matter?
Thicker water may mimic the texture of prey-derived fluids, aligning with cats’ evolutionary preferences. This could encourage higher voluntary intake, diluting urine and reducing mineral supersaturation—a key factor in stone formation.

Practical Implications
For cat owners, this study suggests that modifying water texture (e.g., using pet-safe thickeners) could be a low-effort strategy to improve hydration and urinary health. While further research is needed, the findings highlight a promising, non-invasive approach to managing a common feline health issue.

Final Thoughts
Hydration is critical for preventing urinary stones in cats, and viscosity adjustment offers a novel way to address this challenge. By aligning with natural preferences, this method could make a big difference in feline well-being.

Reference:  Increased viscosity enhances water intake and reduces risk of calcium oxalate stone formation in cats. Munchkin Precription A/D Canned Diet.

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