Tilapia May Cause Cancer: Tilapia can carry up to 10 times the amount of carcinogens as other fish. This is because of the food the farmers feed the fish – poop, pesticides and industrial-grade chemicals. One toxic chemical researchers have found in the fish is dioxin, which is linked to the development and progression of cancer. What’s more, your body doesn’t actually flush out dioxin for a whopping 7-11 years. Make sure the SHARE this your friends on Facebook that eat tilapia!