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FLUTD Diet Analyzer – Wet Food Moisture & Mineral Check

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FLUTD Diet Analyzer

Wet Food Moisture & Mineral Check for Feline Urinary Health

Convert as-fed values to Dry Matter Basis (DMB) and assess FLUTD risk

Wet Food Values (As-Fed Basis)
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Typical wet food: 75–82% moisture
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Enter wet food values and click Analyze

See DMB conversions, FLUTD risk assessment & dietary recommendations

Ideal Ranges for FLUTD Cats (DMB)
Nutrient Ideal Range Caution Risk
Moisture >78% 70–78% <70%
Magnesium <0.10% 0.10–0.15% >0.15%
Phosphorus <1.0% 1.0–1.2% >1.2%
Calcium 0.6–1.5% 1.5–2.0% >2.0%
Sodium 0.3–1.0% 1.0–1.5% >1.5%
Ca:P Ratio 1.1–1.4:1 1.0–1.1 or 1.4–1.6 <1.0 or >1.6

DMB = As-Fed ÷ ((100 − Moisture%) / 100). These are general guidelines; always consult your veterinarian.

Frequently Asked Questions

FLUTD (Feline Lower Urinary Tract Disease) encompasses conditions like urinary crystals, stones, cystitis, and urethral obstruction. Diet plays a critical role—high moisture intake dilutes urine and reduces crystal-forming mineral concentrations. Magnesium, phosphorus, and calcium levels directly influence struvite and calcium oxalate crystal formation. A proper diet helps maintain urine pH balance and promotes frequent urination to flush out irritants.

Cats naturally have a low thirst drive and evolved to get most of their water from prey. Wet food with high moisture (75–82%) significantly increases total water intake, producing more dilute urine. Dilute urine reduces the saturation of minerals that form crystals and stones. Studies show that cats on wet-food diets have a lower recurrence rate of FLUTD episodes compared to those on dry food alone. Aim for at least 75% moisture content in wet food.
Dry Matter Basis (DMB) removes water weight from the equation, allowing you to compare nutrient levels fairly across foods with different moisture contents. For example, a food with 82% moisture and 0.02% magnesium as-fed has a DMB magnesium of 0.11%—much higher than the label suggests. DMB is calculated as: Nutrient% ÷ ((100 − Moisture%) / 100). This is essential for FLUTD management because mineral thresholds are based on DMB, not as-fed values.
On a Dry Matter Basis, magnesium should ideally be below 0.10% (some guidelines say <0.12%). Magnesium is a key component of struvite crystals (magnesium ammonium phosphate). While modern commercial diets have reduced magnesium levels significantly, it's still important to verify—especially for cats with a history of struvite-related FLUTD. Prescription urinary diets often contain magnesium DMB as low as 0.06–0.08%.
The ideal Ca:P ratio for cats is between 1.1:1 and 1.4:1. An imbalanced ratio (especially excess phosphorus) can contribute to calcium phosphate crystal formation and stress the kidneys. Too much calcium relative to phosphorus (>2:1) may also be problematic. Balanced mineral ratios help maintain proper urine pH and reduce crystal precipitation risk. Always calculate the ratio using DMB values for accuracy.
While high-moisture wet food is one of the most effective dietary strategies for FLUTD prevention, it is not a guarantee. Other factors include stress management, adequate water stations, clean litter boxes, and genetic predisposition. Some cats require prescription diets specifically formulated to manage urine pH and mineral levels. Always work with your veterinarian to develop a comprehensive FLUTD management plan tailored to your cat's specific condition.

This tool provides educational estimates only. Always consult a licensed veterinarian for dietary recommendations tailored to your cat's health needs.

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