The Facts About Seed Oils and Your Health
22nd March 2025
At their most basic, seed oils are extracted from seeds. This might seem harmless—after all, olive oil comes from olives, and coconut oil from coconuts.
But not all seed oils are the same. Some, like sesame and flaxseed oil, have been integral to traditional diets for centuries and are extracted through natural, cold-press methods that preserve their nutrients and antioxidants.
Others, however, are highly processed. Industrial seed oils—like soybean, corn, canola, sunflower, safflower, cottonseed, grapeseed, and rice bran—are mass-produced through high-heat extraction and chemical refining.
Manufacturers frequently use solvents like hexane to extract the maximum amount of oil. These oils are refined, bleached, and deodorized, earning them the label “RBD” oils. This process makes them neutral in taste and more shelf-stable, but it also removes beneficial compounds like vitamin E and antioxidants.
Many industrial seed oils were never intended for human consumption. Canola oil began as rapeseed oil, primarily used as a machine lubricant until Canadian scientists modified it in the 1970s to remove toxic compounds. The name itself—a blend of “Canada” and “oil”—was a marketing invention. “Vegetable oil” is another misleading term—it’s often a blend of industrial seed oils marketed to sound healthier than it is.