Labour leader Ed Miliband struggled to name the cost of a weekly shop for a family of four, putting his own family's grocery bill at "£70-80 a week".
Asked on ITV's Good Morning Britain about the average weekly household grocery bill, Mr Miliband responded: "It depends on how much you are spending."
The weekly average spend per person on food and non alcoholic drinks came to £25.98, adding up to £103.92 for a family of four, according to the 2012 Family Food report from the Department of Environment, Food and Rural affairs.
Mr Miliband, who is married with two children, admitted to being "relatively comfortably off" but was adamant Labour were "determined" to tackle the issues facing the general public.
More top news
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.
At least 300 people are actively promoting and recruiting for the terror group from within the United States, academics have found.
Hollywood film director and actor Steven Seagal has been asked to train Serbian special forces in martial arts.