"In Canada it is not mandatory to identify the method of production, including genetic modification, that was used to develop a food product" (http://www.hc-sc.gc.ca/fn-an/gmf-agm/fs-if/faq_3-eng.php).
The main genetically modified crops in Canada are soy, corn, canola, potatoes, and tomatoes. This can help you decide which packaged food you decide to purchase. Organic food is not genetically modified and/or does not contain genetically modified ingredients (
Numerous sources say that fresh produce has PLU codes that identify whether the product is organic or genetically modified. They say a conventionally grown banana's code would be '4011', the organic version would start with a nine ('94011'), and a genetically modified banana would start with an eight ('84011'). (http://www.kipnews.org/2011/07/14/how-to-i-d-genetically-modified-food-at-the-supermarket/)
Want to learn more about genetically modified foods? http://www.who.int/foodsafety/publications/biotech/20questions/en/
Dr. Dielle Raymond, ND