Jamie Oliver has challenged Deputy Prime Minister Nick Clegg to make a personal commitment to reducing childhood obesity by 5% within five years.
The celebrity chef issued the challenge in a recorded message on the Lib Dem leader's Call Clegg radio show on LBC.
Clegg said that his pledge of free school meals for young pupils should help improve children's diets, but declined to commit himself to a particular target.
In his message, Oliver claimed anything less than 5% would be "morally wrong."
Asked if he would back the target, Clegg said, "Whether it's 5%, whether it's 7%, I can't pluck a percentage out of thin air. Maybe we should go for more than 5%."