Cooking oil

Lore & Background

Cooking oil is extracted from nuts, seeds, olives, grains, or legumes using industrial chemicals or mechanical processes such as expeller pressing. Refinement alters the oil's appearance, texture, taste, smell, or stability to meet buyer expectations. Health studies have found a significant correlation between high consumption of saturated fats and blood LDL concentration, a risk factor for cardiovascular diseases. The Mayo Clinic has highlighted oils high in saturated fats, including coconut, palm, and palm kernel oil, while recommending oils with lower saturated fats and higher unsaturated fats, such as olive, peanut, canola, soy, and cottonseed oils. Trans fats from partially hydrogenated oils are considered more harmful than naturally occurring oils and are no longer generally recognized as safe by the US FDA. When cooking, oils that are healthy at room temperature can become unhealthy when heated above certain temperatures, especially when heated repeatedly. Palm oil, due to its higher saturated fat content, can withstand deep frying at higher temperatures and is resistant to oxidation. Oils suitable for high-temperature frying include avocado, mustard, palm, peanut, rice bran, safflower, olive, semi-refined sesame, and semi-refined sunflower oils.

Reader's Guide

Cooking oil is a fundamental component of global cuisine, enabling high-temperature cooking methods that enhance flavor and texture while reducing uneven cooking. Its significance extends beyond the kitchen into public health, as dietary guidelines emphasize replacing saturated fats with polyunsaturated and monounsaturated fats to lower heart disease risk. The choice of oil depends on cooking temperature, as heating can oxidize fatty acids and create toxic compounds; oils with higher smoke points, such as palm and avocado oil, are preferred for deep frying. Storage conditions also matter: oils degrade in response to heat, light, and oxygen, with refined high-monounsaturated oils lasting up to a year and high-polyunsaturated oils about six months. The industrial food industry increasingly uses palm oil for its stability in high-temperature applications, though refined palm oil loses most of its carotenoid content. Overall, cooking oil's legacy lies in its dual role as a culinary essential and a subject of ongoing nutritional research.

Did You Know?

• Cooking oil allows higher cooking temperatures than water, making cooking faster and more flavorful.
• Trans fats from partially hydrogenated oils are more harmful than naturally occurring oils and are no longer generally recognized as safe by the US FDA.
• Palm oil can withstand deep frying at higher temperatures and is resistant to oxidation compared to high-polyunsaturated vegetable oils.
• Cashew oil and other nut-based oils do not present a danger to persons with a nut allergy because oils are primarily lipids.