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How are food oils produced via mechanical extraction?

Michael T. Murray, ND
Naturopathic Medicine

The mechanical method differs from the chemical method only in how the oil is initially extracted. The seeds are cooked at high temperatures for up to two hours and then mechanically pressed through the expeller. The pressure can be as high as several tons per square inch. This results in the generation of heat, usually around 200 degree Fahrenheit. The higher the heat, the greater the oil yield. The oil pressed in this manner can be filtered and sold as "cold-pressed" (no external heat was used during the extraction) or as natural, crude, or unrefined oil. Or, the oil can be processed to produce refined oil. Be aware that even if the oil has undergone refinement, it can still be labeled "cold pressed" because no external heat was applied during the extraction.

Encyclopedia of Healing Foods

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Encyclopedia of Healing Foods

From the bestselling authors of The Encyclopedia of Natural Medicine, the most comprehensive and practical guide available to the nutritional benefits and medicinal properties of virtually everything...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.