It's true! Chocolate bars are getting smaller
The ONS said so-called "shrinkflation", where the size of a product is reduced and the price stays the same, has added 1.22 percentage points to the inflation rate of the sugar, jam, syrups, chocolate and confectionery category since 2012.
The statistics agency said chocolate manufacturers had blamed the drop in size on the rising cost of raw materials.
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Hide AdHowever, the European import price of sugar sank to its lowest level on record in March this year, while cocoa prices have dropped sharply since record highs seen in 2015.
The ONS brushed aside the idea of Brexit being a key factor behind the falling size of chocolate bars.
It said: "Manufacturers' costs may also be rising because of the recent fall in the value of the pound - leading some commentators to attribute shrinkflation on the UK's decision to leave the European Union.
"But our analysis doesn't show a noticeable change following the referendum that would point towards a Brexit effect.