When you buy a bottle of olive oil, the rolling Tuscan hills on the label and the “made in Italy” stamp should reassure you the product is as Italian as Chianti or Armani. In fact, there is no guarantee the oil is from Italy, reports The Scotsman.

That would change under an Italian bill that forces manufacturers to declare where their oil comes from, meaning many famous brands would have to reveal, for the first time, that most of their “Italian” oil originates from places such as Spain and Tunisia.

Italy’s olive farmers have convinced their government to change the current rules that allow oil to be labelled as Italian as long as it is blended in Italy even if, as is often the case, it has been trucked in from overseas.

Italy is both the biggest exporter and importer of olive oil, but its annual production of 650,000 tonnes is not enough to satisfy even domestic demand for the ingredient at the heart of the Mediterranean diet.