The average UK household has lost £21.31 in the past three months as supermarket prices rise due to Brexit inflation, research by Kantar Worldpanel has found.
The research found supermarket prices jumped by 2.3% in the 12 weeks to March 26, with the price of staples including butter, fish, tea and skincare all rising.
This price rises are set to continue in the year ahead due to the falling pound and rising inflation since the Brexit vote, while workers are expected to see a real-term cut to their wages.
Liberal Democrat Shadow Chancellor Susan Kramer said: "Shoppers are feeling the Brexit squeeze, with prices rising while real wages continue to fall.
"This is only set to get worse as the Government continues with its reckless plans to damage our economy by pulling Britain out of the Single Market.
"It's not too late to stop a hard Brexit and prevent a long-term squeeze to people's living standards.
"The British people must be given the final say over what comes next. They can choose to keep Britain in the Single Market, and if they want, to remain in the European Union."