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%."
Television chef Jamie Oliver is closing three of his four Union Jacks restaurants.
Branches in Chiswick and Holborn, in London, plus another in Winchester, Hampshire, are closing, while the restaurant in Covent Garden will remain open.
The restaurant blamed the tough economic climate for the closures on their Twitter feed.
"It's no secret that the industry has been affected by the tough climate& a proposal has been made to close UJ Chiswick, Holborn&Winchester," the tweet read.
"We'd like to say a huge thank you to everyone,we have loved meeting you all. Please do pop along to our Covent Garden Piazza restaurant."
Launched in 2011, the chain was billed as being "all about bringing back nostalgic British classics using the best artisanal ingredients" and charged £15 for Fish and Chips.
Jamie Oliver has banned his children from joining social networking sites or owning mobile phones over fears they could be bullied.
The celebrity chef, who often posts on Twitter and Facebook, has forbidden his daughters Poppy, 11, and Daisy, 10, from doing the same.
Oliver, a friend of Instagram’s co-founder Kevin Systrom, told Closer magazine: "I found out my two eldest girls had set up Instagram accounts in secret, which I was not happy about and soon put a stop to it.
“Poppy’s the only girl in her class still not allowed a mobile. It may sound harsh, but I do worry about the bullying that can go on with these sites.”
“I know the girls have had a hard time in the past at school because their dad’s on TV. I just don’t want to risk it happening online too. It’s impossible to keep an eye on,” he added.
London Mayor Boris Johnson highlighted celebrity chef Jamie Oliver's comments about the work ethic of British young people during his conference speech.
Mr Oliver praised European immigrants in August, saying they are much "tougher" workers than the "wet behind the ears" young Brits.
Mr Johnson asked delegates, "What if he has half a point? Or a quarter of a point?"
He said if that indeed was the case, "don't we need Iain Duncan Smith to get on reforming the welfare system and ensuring you're always better off in work than out of it?"
"And if it's to do with education ... then don't we need Michael Gove to get on with his heroic work of restoring rigour and realism to the classroom?"
Celebrity chef Jamie Oliver said European immigrants are much "tougher" workers than the "wet behind the ears" young Britons. We asked on our Facebook page whether you agreed with his comments, here is a selection of your answers:
Celebrity chef Jamie Oliver said "it's all very well" for people to complain about immigration but that immigrant workers have been good for his business.
He told Good Housekeeping magazine: "I think our European immigrant friends are much stronger, much tougher.
"If we didn't have any, all of my restaurants would close tomorrow. There wouldn't be any Brits to replace them.
"It's all very well when people are slagging off immigration and I'm sure there are problems. Older people always complain about youth and I think it's a good thing because it is always changing. The young will be better at different things. But long hours in hot kitchens is not one of them!"
TV chef Jamie Oliver has praised European immigrants saying they are much "tougher" workers than the "wet behind the ears" young Brits.
Oliver told Good Housekeeping magazine that his restaurants would shut immediately if he had to find only British staff.
He said: "The average working hours in a week was 80 to 100. That was really normal in my 20s. But the EU regulation now is 48 hours,which is half a week's work for me. And they still whinge about it!
"British kids particularly, I have never seen anything so wet behind the ears! I have mummies phoning up for 23-year-olds saying to me, 'My son is too tired'. On a 48-hour-week! Are you having a laugh?"
Jamie Oliver, who campaigned against unhealthy meals like the Turkey Twizzler, has congratulated Leon founders Henry Dimbleby and John Vincent on their School Food Plan: