Amid fears rising food prices are hitting those on lower incomes harder, changes are being made to better understand the impact - but how have costs changed in the past decade?
December saw prices for food and non-alcoholic drinks rising at their fastest monthly rate since January 2012 - up 1.3% in a month.
That rise was part of the reason the figures released by the Office for National Statistics last week showed the overall Consumer Prices Index (CPI) rose by 5.4% in the 12 months to December 2021, up from 5.1% in November.
