It is believed that organic, non-GM food is safe for the environment, relying on non-intensive farming methods that avoid the use of harmful pesticides and scientific practices.
Advocates of 'non-GM' eating often also claim that GM food is of a poorer quality than non-GM and may have adverse health side effects. Research into the health risks and environmental effects of GM food is ongoing and - so far - inconclusive: However, as organic farming methods are undoubtedly beneficial to the environment (burning less carbon than conventional methods whilst using no chemicals) and are always non-GM, it is a safe assumption that if you are shopping for a sustainable lifestyle you will be avoiding GM foods, whilst always buying organic.
What to Look For - Sustainable Labelling
Under UK laws that retained EU regulations (The Traceability and Labelling of GMOs; EC No. 1830/2003 and the GM Food and Feed Regulation; EC No. 1829/2003) 'Genetically Modified' produce must be clearly labelled as such.
The law does allow for the presence of 0.9% genetically modified material in food products that are not labelled 'GM'. This is because non-GM crops that come into contact with GM crops can contaminate them with small traces of GMOs (Genetically Modified Organisms).
The law has been criticised for being unclear: Companies are not obligated to label food as a 'GM product' or as a 'GM free' product and are only obligated to provide a small note stating that a specific ingredient is from a GM source (for example 'this product contains genetically modified […]').
Meat, poultry and eggs that have been reared on GM feed do not have to be labelled as GM at all. Therefore, if in doubt, it is always best to buy Organic.

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Under UK organic product regulations (which retained previous EU regulations from 1993), government-approved bodies, to ensure their authenticity, must strictly regulate food labelled 'organic'. Organic labelling must also stipulate which certification body the manufacturer adheres to. Each body has a number assigned to it, which will appear somewhere on the product label. They may also contain the logo of that certification company. For example, a product certified by the U.K's biggest certification body, 'the Soil Association', will contain their logo and the words: 'E.C Organic certification UK5'. Without such an endorsement you must assume that the product is not organic.
Critics are unhappy with a clause in organic labelling law that states that a product certified as organic can contain up to 5% non-organic produce. One way to avoid this pitfall is to avoid buying readymade products that contain several ingredients: If you buy separate individual products that are marked as organic, such as unwrapped fruit and vegetables there will be no risk of it containing a rogue 5%, intensively farmed, GM element!
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Voluntary Labelling Schemes
Other labels include the 'Leaf Marque' label, which applies to foods produced by farmers who are committed to sustainable farming methods that contribute to the well being of the surrounding countryside and the 'Marine Stewardship Council' logo, which certifies that a seafood product has been farmed from a sustainable source. The 'Red Tractor' logo is applied to foods that meet the 'Assured Food Standards' requirements, an industry regulated scheme that covers a range of issues including environmental concerns. As schemes like these are voluntary (producers do not have to bear these logos) it is worth familiarising yourself with the different schemes and their agendas. This way you can choose to adhere to the standards you are happiest with.
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