Exposure to radiation. Meat is sometimes irradiated in the United States to kill micro-organisms and reduce the number of microbes present due to unsanitary practices, but this process alters the nutritional quality and creates new chemicals that can be harmful to the humans who consume the meat. Many believe that there has not been enough testing to know whether irradiated food is safe for humans. The only foods in Canada that have been approved for irradiation are; potatoes, onions, wheat, wheat flour, spices, dried vegetable seasoning, and herbs. For more information, Food and Water Watch's food irradiation page

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