Poland’s competition and consumer watchdog is examining "shrinkflation" moves in the country by Danone, Mondelez International, Nestlé and Unilever.

UOKiK, Poland’s Office of Competition and Consumer Protection, is looking into if the companies “provide clear and accurate information about reductions in the quantity or weight of products, particularly where the packaging remains unchanged”.

The regulator said the review covers food, cleaning and personal care products sold on the Polish market.

It will assess whether the companies' product information could mislead consumers into believing pack sizes have not changed.

UOKiK president Tomasz Chróstny said: “Reducing the weight without changing the price effectively means that consumers pay more for the product. This makes it more difficult for consumers to compare prices and undermines their trust in undertakings.”

The move follows an April ruling by the Court of Justice of the European Union (CJEU) in Case C-301/25, which, according to UOKiK, confirmed that "even if a product complies with food law requirements" that would not "preclude an assessment of whether the practice is misleading to consumers under the rules on unfair commercial practices".

If UOKiK finds evidence consumers were misled, the authority may move to formal proceedings.

“Downsizing is not a new phenomenon. What is new, however, is the CJEU judgement, which unequivocally confirmed that such practices may also be assessed from a consumer protection perspective. Undertakings should provide clear and easily understandable information about changes in product weight,” Chróstny said.

A spokesperson for Mondelez's Polish business said: "We confirm that Mondelez Polska is cooperating with the Office of Competition and Consumer Protection and is providing all necessary clarifications."

The Polish action comes after France introduced rules in 2024 requiring large and medium-sized retailers to display in-store notices when food and drink products shrink in size.