Fats and oils: what is the difference between refined and unrefined oils?

The difference between refined and unrefined oils lies in the degree and methods of their industrial processing. Unrefined oils undergo only mechanical purification, such as filtration and centrifugation. Because of this, they retain the maximum amount of vitamins, natural antioxidants, biologically active substances, and the characteristic rich taste and aroma of the original raw material, such as seeds or olives.

Refined oils undergo multi-stage purification, which includes hydration, neutralization, bleaching, and deodorization. During these processes, foreign impurities, phosphatides, free fatty acids, and aromatic compounds are removed from the product. The oil becomes transparent, completely loses its pronounced odor, and acquires a neutral taste that does not overpower the flavors of other ingredients in the dish.

The choice between these two types of oils depends entirely on the culinary task. Unrefined oils are ideal for dressing cold salads, prepared porridges, and making sauces. They are not intended for thermal processing, as heating destroys beneficial substances, and the oil begins to smoke and burn.

Refined oils are created specifically for frying, stewing, and baking. Their high smoke point allows cooking at high temperatures without the formation of carcinogenic substances. A sensible approach involves using both types of oils in the diet: unrefined for health and flavor in cold dishes, and refined for the safe preparation of hot food.