Exposure to oxygen, light, and heat accelerates the breakdown of the oil's fatty acids and polyphenols, which are the very compounds responsible for its health benefits and complex flavor. If the oil becomes excessively thick, gummy, or develops a strange film on the surface, it may be breaking down.
How to Tell If Your Olive Oil Goes Bad Smell and Sight
However, this date represents the period when the oil is at its optimal flavor profile, with the intended balance of fruitiness, bitterness, and pungency intact. This chemical transformation is the direct cause of what is commonly described as "off" flavors, making the oil taste stale, greasy, or reminiscent of old nuts.
Olive oil, a staple of Mediterranean cuisine and a cornerstone of healthy eating, is often treated with a degree of reverence that borders on the sacred. When stored properly in a cool, dark pantry, high-quality extra virgin olive oil can remain safe to consume for many years beyond this date.
How to Tell If Your Olive Oil Is Rancid and Spoiled
This "rancid" smell is the most immediate red flag that the oil has gone bad and should no longer be used. Furthermore, if you notice visible sediment at the bottom of the bottle that is not actual olive pulp, it could be a sign of advanced deterioration.
More About Olive oil does it go bad
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