Nearly all of the 100 cat foods tested by the Clean Label Project contain toxic contaminants, according to a report released Friday. The nonprofit, which evaluates consumer products for safety, found detectable levels of lead in 99% of samples, cadmium in 96% and arsenic in 94% across 62 brands.
Testing covered wet, dry and air‑ or freeze‑dried formulas, including products marketed as natural or premium. Heavy metals such as lead, mercury and arsenic were present in every type of food, while the herbicide glyphosate appeared in 37% of the products. The plastic chemical DEHP, linked to cancer and birth defects, was detected in about half of the samples.
Potential health impacts for cats
Lead exposure can damage virtually every organ system, and children are especially vulnerable because they absorb a higher percentage of ingested lead. While cats are not children, they also absorb more of these toxins than larger animals, and chronic exposure may contribute to kidney disease—a leading cause of death in older cats.
Mercury, found at especially high levels in fish‑based cat foods, is toxic to the nervous, digestive and immune systems, as well as the kidneys, lungs and skin. The study noted that wet seafood formulas contained nearly 28 times more mercury than wet foods made with other proteins.
Protein sources matter
Cat foods that rely on fish or seafood as the main protein showed the highest concentrations of mercury and cadmium. In contrast, chicken‑based formulas performed better for those metals but showed higher rates of lead and herbicide residues. Overall, about 85% of poultry‑based foods met the Clean Label Project’s purity standard, compared with just 25.7% of fish‑based products.
Dry cat food tended to contain roughly three times more lead than wet or air‑dried varieties. Products with more plant ingredients in the top ten label positions also showed higher glyphosate levels, suggesting that added produce can introduce pesticide residues.
Industry response
The Pet Food Institute, representing cat‑food manufacturers, emphasized that its members operate comprehensive safety and quality programs, including ingredient specifications, supplier verification and testing protocols. CEO Elise Fennig stated that pet owners should feel confident that the foods they purchase meet rigorous regulatory and quality standards.
Science director Ryan Babadi of the nonprofit Toxic Free Future praised the investigation as “reasonably conducted” and called on major retailers to require suppliers to eliminate harmful chemicals that are already being phased out or banned in many other products.
Limitations and recommendations
The study tested a single batch of each product, so it cannot account for variations between batches. Researchers advise cat owners to vary their pets’ diets, especially if they favor seafood, and to read ingredient lists carefully, as foods without fish in the name may still contain seafood derivatives.
While the findings highlight a need for stronger safety standards specific to pets, the Clean Label Project’s work provides a valuable benchmark for consumers seeking the safest options for their feline companions.
Original reporting: KEYT (Ventura/Santa Barbara) — read the source article.
