Delegates at a fringe meeting yesterday also heard that providing free school meals to all children up to the age of 16 could make a huge contribution to tackling child obesity.
Last week the Liberal Democrats announced plans to give a free meal to all children up to the age of seven - and urged the Scottish Government to follow suit.
But Labour's shadow public health minister Diane Abbott said politicians should go much further, although she made clear that such a change was not party policy.
Mrs Abbott also triggered further controversy by taking a swipe at some of her senior party colleagues, saying that while shadow health secretary Andy Burnham was a "really nice guy" and good to work with, "I wouldn't say that about some people in the shadow cabinet".
One of her colleagues, shadow home secretary Yvette Cooper, told the conference that women across the UK would get "angrier and angrier" until the Government did more to promote gender equality.
Warning David Cameron that women would not "calm down", Ms Cooper said she wanted to end discrimination against working women who go on maternity leave, 50,000 of whom lose their job every year.
Ms Cooper also claimed the Tory-Lib Dem Coalition was dividing the country geographically.
"North and south divided - as ministers claim the good times are here, but in Scotland and across the north of England unemployment is going up," she warned.
Other debates seemed to point to areas where Labour would come under pressure from its own supporters if re- elected in 2015.
The party is likely to come under pressure to re-nationalise the Royal Mail if it wins the next general election - after unions overwhelmingly voted to debate the Government's decision to privatise the service.
The controversial plans were one of six topics selected by the unions and constituency Labour parties for debate over the next three days.
Shadow Welsh secretary Owen Smith warned that devolution of powers from Westminster to Wales would fail to replicate the social and economic "safety net" provided by the United Kingdom.
He said: "Devolution is not enough. No, a Labour government in Wales alone is not enough - and it will never be enough."