It takes more than a quick pass under the scanner to spot the genetically modified food in your shopping trolley.
With that in mind, the Sydney Morning Herald put a basket of everyday groceries under scrutiny - with surprising results.
Australian manufacturers were asked if any ingredients in these products - alsosold in New Zealand - came from genetically modified crops.
When the results were published in Australia, sweetmaker Mars quickly issued a statement telling consumers its new policy of using only GM-free ingredients.
The following list is based on the Herald survey, but names foods available in NZ that manufacturers said did or might contain GM ingredients.
Arnott's Tiny Teddy Arnott's Assorted Creams Arnott's Tim Tams Chicken Tonight, Herb Chicken with Wine Continental Chicken Noodle Soup (dried) Jaffas John West Raspberries in Syrup Kit Kat Maggi Chicken and Sweet Corn Mug Noodle Soup Maggi 2 Minute Chicken Noodles Meadow Lea Cholesterol Free Margarine Paul Newman's Own Classic Tomato, Onion & Garlic Sauce S-26 Infant Formula Uncle Toby's Muesli Bars (Crunchy) Uncle Toby's Breakfast Bars Uncle Toby's Fruit Roll-Ups Vogel's Soy & Linseed Bread
Manufacturers won't say
Kinder Surprise Kraft Cheesticks Kraft Coleslaw Dressing Kraft Italian Dressing Kraft Smooth Peanut Butter Nutella Vegemite
(A Kraft statement from Australia says: "Kraft will comply with all relevant Australian labelling laws. However, there are no foods produced by Kraft which require re-labelling under the new legislation.")