Fats and oils: how to properly store vegetable oils so they don't go rancid?

Proper storage of vegetable oils is critically important for preserving their beneficial properties and preventing oxidation. Oxidation of fats leads not only to a deterioration in taste and the appearance of an unpleasant bitter odor, but also to the formation of toxic free radical compounds. The main enemies of vegetable oils are light, heat, and atmospheric oxygen.

To minimize exposure to light, always buy oils in bottles made of dark glass or opaque plastic. If the oil is sold in transparent packaging, pour it into dark glassware or store it in a closed kitchen cabinet. Avoid placing bottles near the stove or other heat sources, as constant temperature fluctuations accelerate product spoilage.

A special approach is required for unrefined cold-pressed oils, such as flaxseed, pumpkin seed, or sesame oil. Due to their high content of polyunsaturated fatty acids, they spoil faster than others.

Refined oils with a high content of monounsaturated and saturated fats, such as olive or refined sunflower oil, are less susceptible to oxidation. They can be stored at room temperature in a dry, dark place, but also away from heating appliances. Following these simple rules will help you consume a truly healthy product without harming your health.