Brexit has added £210 to the average household food bill in the two years to the end of 2021, new research suggests.
Academics at the London School of Economics found that the cost of food imported from Europe went up because of extra red tape and checks.
It said that the changes for items going across the border had pushed food prices up by 6% to £5.84bn overall.
Price rises hit poorest households hardest because they spend more of their pay packets on food, it added.
But it noted one benefit seen since Brexit was reduced competition for food producers in Britain.
The BBC has contacted the Department for International Trade for comment.
Researchers at its Centre for Economic Performance (CEP) looked at data tracking the flow of trade and prices of food products between the UK and the European Union (EU) to work out how shoppers were being affected by the UK's exit.
Their calculations sought to isolate the effects of Brexit and separate them out from other supply chain issues that caused disruption during the pandemic.
It blamed the increase in food prices on a rise in "non-tariff barriers" on trade between the UK and the EU, which include things like new customs checks at the borders, new paperwork requirements and broader measures affecting the movement of animals and plants.
https://www.bbc.co.uk/news/business-63821133