Under Ofcom regulations, broadcasters must inform viewers by displaying the letter 'P' for three seconds at the start and end of a programme that contains product placement.
Birds Eye said they were introducing a "triple lock" DNA testing programme which means no minced beef product can reach the supermarket shelf without have been cleared at three stages of DNA testing.
Nevertheless, Weight Watchers is revamping its product with the launch in America on August 17th of a new programme called Flex Points, which is supposed to be easier for slimmers to follow.