The survey also found that more than one in three kebabs contained meat from several different species of animal.
Some kebabs sold as Halal - suitable for Muslims - were even found to contain pork, which is banned by the faith.
The thought of a red-grey slab of meat turning on a spit, heated by what looks like the bar of an electric fire, is perhaps not the most appetising of sights.
Yet feasting on a doner has become something of a treat for millions of Britons, particularly after the pubs shut on a Friday and Saturday night.
However, a survey of 76 councils across the country, which tested 490 kebabs, revealed that many contained worryingly large amounts of fat and salt, even before
the addition of mayonnaise and other extras.