Hundreds of products including bread, breakfast cereal and chocolate bars have decreased in size, leaving shoppers with stealth price rises.
A number size changes have attracted attention, particularly the increase in the triangle gaps of Toblerone bars in 2016 by Mondelez International.
The confectionary company has since backtracked and announced Toblerones would revert to their original shape.
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Mars shrank its Maltesers, M&Ms and Minstrels by up to 15 per cent while McVities Jaffa Cakes are around 10 per cent lighter, but prices have remained unchanged.
Manufacturers faced rising input costs as the pound fell sharply in the days following the referendum.
The bread and cereal category saw the most size changes with 36 reductions and 18 increases, the ONS said. »
