"Under EU regulations, GM maize and soya (in the form of, respectively flour and protein) must be labelled 'GM' or 'modified'. However, 'derivatives' of these two crops - present in most processed foods - don't have to be labelled, because the altered DNA has been processed out of the product. Nor do GM ingredients have to be declared when present in very small quantities (less than 1 per cent)." (Quoted from article)