It is the gourmet staple favoured by celebrity chefs for its health benefits and distinctive taste.
But shoppers who cook with extra virgin olive oil could be wasting their money – because it loses most of its benefits when it is heated.
Olive oil has more antioxidants than other oils and also contains bioactive components – called phenolic compounds – thought to help ward off cancer and other diseases.
However, when oils are heated they degrade in quality, say researchers from Portugals University of Porto.
Writing in the journal Food Research International, they said their research showed that any kind of heating reduced the power of the phenolic compounds in the oil.
They said: Virgin olive oil consumption, as final seasoning or within cooked foods, is increasing worldwide, mainly due to its recognised nutritional benefits.
However, different cooking practices, from common frying, to boiling and microwave cooking, undoubtedly modify the olive oil chemical profile. Continue reading