This short article delves into the often overlooked processes behind the production of oils found on store shelves, highlighting the differences between refined and cold-pressed oils. The majority of refined oils are produced through an extraction process that involves using solvents like hexane—a component of gasoline. During this process, the seeds and nuts are heated to high temperatures, which depletes the oils of many of their beneficial substances. After the hexane evaporates, the oil undergoes hydration and neutralization with alkali, resulting in a large quantity of inexpensive oil with minimal health value.
Cold-pressed oils, while generally perceived as healthier because they retain more beneficial substances, still have significant drawbacks. The process typically involves a screw press, which can generate frictional heat up to 60°C, causing a partial loss of these beneficial substances. Additionally, the metal contact in the screw press can lead to oxidation, further degrading the oil's quality by reducing its omega-acid content.
To produce oil that fully retains the nutritional benefits of seeds and nuts, Gavriiuk advocates for a method that involves pressing without heat or metal contact. This technique, known as raw oil production, involves only cutting the raw materials before pressing, making it ideal even for raw food enthusiasts. This method ensures that the oil maintains its nutritional integrity, providing a product that is both healthier and more beneficial for consumers.
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