Nearly every cat food tested in a recent national study contained contaminants that can accumulate in a cat’s body over time. The Clean Label Project, a Colorado nonprofit that tests consumer products for harmful substances, examined 100 best‑selling cat foods and found lead in 99% of the samples, cadmium in 96%, and arsenic in 94%.
Key contaminants and their sources
Heavy metals such as lead, cadmium and arsenic occur naturally in soil, water and air, but industrial pollution and agricultural practices can increase their presence in food. The study also detected the herbicide glyphosate in 37% of the products and the plastic chemical di(2‑ethylhexyl) phthalate (DEHP) in about half of the samples.
Variation by product type and protein source
Dry cat food showed roughly three times more lead than wet or air‑dried varieties. Fish‑ and seafood‑based formulas contained the highest levels of mercury and cadmium – mercury was about 18 times higher and cadmium 2.5 times higher than in foods made with other proteins. Wet seafood products had nearly 28 times more mercury than wet foods made with poultry.
Chicken‑based foods performed better for mercury and cadmium but showed higher rates of lead and glyphosate. Overall, 85% of poultry‑based foods met the Clean Label Project’s purity standard, compared with just 25.7% of fish and seafood products.
Potential health impacts for cats
Lead exposure can damage major organ systems, while cadmium is a known carcinogen that harms kidneys and bones. Inorganic arsenic is also classified as a human carcinogen. Although cats are carnivores, many manufacturers add plant ingredients for vitamins and antioxidants, which can introduce pesticide residues such as glyphosate.
“The contaminants are an ongoing exposure that may accumulate in cats’ bodies over their lifetimes,” said Molly Hamilton, executive director of the Clean Label Project. “Chronic kidney disease, a leading cause of death in older cats, is linked to heavy‑metal exposure because the kidneys filter these toxins.”
Industry response
The Pet Food Institute, which represents cat‑food manufacturers, responded that the industry follows comprehensive safety and quality assurance programs, including ingredient specifications, supplier verification, testing protocols and traceability systems. Elise Fennig, the institute’s CEO, said, “Cat owners should feel confident that the food they feed their pets is safe and produced according to rigorous regulatory and quality standards.”
Expert commentary
Ryan Babadi, science director for the nonprofit Toxic Free Future, called the analysis “reasonably conducted” and urged major retailers to require suppliers to eliminate harmful chemicals that are already being phased out or banned in many other products.
What pet owners can do
Hamilton recommends varying a cat’s diet, especially if it favors seafood, and choosing proteins such as chicken that tend to have lower mercury and cadmium levels. Reading ingredient lists and opting for products with fewer plant additives may also reduce glyphosate exposure.
Study limitations
The investigation tested a single batch of each product, so it could not capture variations between batches. Hamilton noted that brands that routinely screen for contaminants generally show more consistent results over time.
While the study does not prove that any specific product will cause harm, the prevalence of these contaminants highlights the need for continued testing and greater transparency in the pet‑food industry.
Original reporting: WESH Orlando — read the source article.
