Nutro Cat Food Contains Lethal Amounts of Zinc
According to the National Research Council an adult cat needs 4.6 mg of zinc a day for optimal health.
A daily dose of Nutro cat food contains approximately 179 mg, depending on the particular batch of food that is tested. Nutro cat food tested at the Washington Diagnostic and Disease Lab show two of three Nutro samples contained zinc at levels that would be illegal for sale in the European Union, at 270 ppm and 380 ppm. The third Nutro sample came in at 230 ppm. 
From the Pet Foods Products Safety Alliance:
“Using this food by Nutro recommended feeding guidelines, a pet eating this food would receive over 38 times the amount of zinc recommended by the National Research Council, or 175 mg. zinc a day. Using the most frequently cited median lethal dose for zinc of 100 mg. per kilogram of body weight, a 4 kilogram cat (9 pounds) would be exposed to the median lethal dose of zinc in slightly over 2 days. It is highly unlikely a pet exposed to this food would survive after being exposed to it for more than a few days to a week. Clinical symptoms consistent with pancreatitis would be the most likely outward signs of exposure to this food, with possible liver and kidney damage.”
What do you think they’ll come up with if they test other brands of cat food?
Clinical signs of zinc toxicity are vomiting, diarrhea, red urine, icterus (yellow mucous membranes) liver failure, kidney failure, and anemia. http://www.veterinarypartner.com/Content.plx?P=A&A=565&S=2
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