While oil does not spoil in the same way that milk turns sour, it undergoes oxidation and hydrolysis that degrade its quality, flavor, and nutritional value. Over time, the unsaturated fats in oil break down, forming aldehydes and ketones.
How Long Cooking Oil Lasts and What Affects Its Shelf Life
Heat is another enemy, as high temperatures during cooking break down the molecular structure of the oil. When to Keep and When to Toss.
For oils rich in flavor, such as walnut or pumpkin seed oil, refrigeration can be beneficial, though it may cause clouding upon cooling. Oil Type Typical Shelf Life (Unopened) Primary Stability Factors Olive Oil (Extra Virgin) 12-18 months Polyphenols, low acidity Vegetable Oil (Canola/Soybean) 1 year Refinement, neutral flavor Sesame Oil (Toasted) 6-12 months High aromatic compounds Coconut Oil 24 months Saturated fat content Best Practices for Storage Extending the life of your cooking oil requires mindful storage habits.
How Long Cooking Oil Lasts and What Affects Its Shelf Life
Signs Your Oil Has Gone Bad Identifying rancid oil is straightforward if you know what to look for. This process is known as oxidative rancidation.
More About Does cooking oil go bad
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