Verdict: In moderation
Spinach contains oxalates which can bind with calcium, potentially leading to the formation of calcium oxalate crystals in the urinary tract. While small amounts are unlikely to cause immediate harm, regular or large consumption can contribute to urinary issues, especially in cats prone to crystal formation.
Oxalates bind with calcium to form insoluble calcium oxalate crystals, which can irritate the urinary tract and contribute to urolithiasis (urinary stones).
Oxalates (Oxalic Acid)