Myth #4 Preservatives cause cancer and other diseases.
There is no scientific evidence to support the often repeated claim that preservatives cause cancer. In fact, just the opposite may be true, as preservatives added to pet foods can help prevent the formation of cancer-causing compounds within the food.
Pet foods contain fat and fat-soluble vitamins that readily oxidize when exposed to air. Fat oxidation produces toxic compounds called peroxides that can disrupt cell membranes—and loss of cell membrane integrity. Preservatives protect the fat and vitamins from oxidizing in the presence of air.