The move, which takes effect from today, will see the cable and satellite channel now broadcast from 5am to 9pm.
UK Food, which launched in November 2001, is the only remaining dedicated food channel and has attracted more than 7.5m viewers since launch.
Nick Thorogood, head of lifestyle, said: "Our extended hours will provide an opportunity for more people to enjoy our unique mix of original food programmes, combined with well-known and well-loved faces within the world of food."
UK Food programming includes shows such as 'Nigella Bites', presented by Nigella Lawson; 'Dinner In a Box' with Quo Vadis chef Curtis Stone; 'Celebrity Ready Steady Cook', where TV stars take up the challenge to cook a meal in 20 minutes; and 'The Naked Chef' with Jamie Oliver.
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