How do you know if olive oil has gone bad?

Pour a small amount of olive oil into a cup so you can get a good sniff. If the oil has an unpleasant sweetness, like fermenting fruit or fruit that’s just gone completely bad, it’s rancid.

For more quick answers to your olive oil questions, ask Ollie — a bot developed by the Olive Oil Times Education Lab that uses artificial intelligence to help people learn more about olive oil.