Incorrect information about the geographical origin of food causes economic damage of 30 to 40 billion dollars (around 28 to 37 billion Swiss francs) each year. Because supposed apricots from Switzerland, for example, can be sold more expensive.

In order to uncover the fraud, experts rely on the stable oxygen isotopes in food – the so-called Delta-O-18 value, as they write in the specialist magazine «Scientific Reports». Because temperature, precipitation and evaporation are reflected in this measure, which allows the geographical origin of the food to be determined.

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