Avocados spoil quickly due to oxidation, but a simple kitchen hack using cooking oil can keep them fresh longer. Cookbook author Taesha Butler, founder of The Natural Nurturer, recommends brushing exposed avocado flesh with avocado or olive oil to create a barrier that slows browning.
Why Avocados Brown
When an avocado is sliced, oxygen interacts with enzymes in the flesh, triggering oxidation. This chemical reaction causes browning and moisture loss, often spoiling the fruit within a day. Coating the flesh with oil prevents air contact, preserving freshness for several days.
How to Store Avocados with Oil
Brush a thin layer of oil—such as olive or avocado oil—onto the cut surface. Wrap the avocado tightly in clingfilm to minimize air exposure. Place it flesh-side down in a sealed container and refrigerate. This method keeps avocados fresh for an additional two to five days, according to Butler.
Butler said: "Brush the exposed flesh with a little avocado or olive oil. This will create a barrier between the flesh and air, slowing down browning. I find a pastry brush is perfect for the job."
Avoid Storing in Water
Social media trends suggest submerging avocados in water, but this is misleading. Water does not prevent browning and can promote harmful bacterial growth, making the fruit unsafe to eat. The oil method is safer and more effective.
Freezing for Longer Storage
For extended storage, freeze mashed avocado. Freezing whole avocados makes them soft and watery, so mashing first preserves texture. Frozen avocado works well in spreads or smoothies, reducing food waste.
