This reaction is significantly accelerated by light and heat. Instead, it undergoes a process called oxidation and can become rancid.
Decoding Olive Oil Flavor: From Peppery, Grassy, to Fruity Notes
As the oil degrades, these vibrant notes are replaced by stale, flat, or even off-putting flavors reminiscent of crayons or old nuts. Unopened bottles of high-quality extra virgin olive oil can last for 12 to 18 months past this date if stored correctly.
Clarity is typically a sign of freshness in refined oils. Refined olive oils and olive pomace oils generally have a longer shelf life than extra virgin varieties due to their lower levels of delicate compounds.
Exploring the Peppery, Grassy, and Fruity Flavors of Fresh Olive Oil
The oil essentially "turns" as it interacts with the environment. Fresh olive oil has a distinct flavor profile—often described as peppery, grassy, or fruity.
More About Can olive oil go bad
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