Seed Oils (Industrial Vegetable Oils)
Definition
A category of highly refined cooking oils extracted from the seeds of plants using industrial processes — typically involving chemical solvents (hexane), high heat, bleaching, and deodorizing. Includes soybean oil, canola oil, corn oil, sunflower oil, safflower oil, cottonseed oil, and grapeseed oil.
Why It Matters
Seed oils are extremely high in omega-6 polyunsaturated fatty acids (PUFAs), particularly linoleic acid. The modern Western diet contains an omega-6 to omega-3 ratio of approximately 20:1 (optimal is 1-4:1). This imbalance drives chronic systemic inflammation, which is a root cause of heart disease, metabolic syndrome, and autoimmune conditions. The refining process itself generates harmful oxidation byproducts including aldehydes and trans fats.
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Palm Oil (Refined)
CautionAn edible vegetable oil derived from the fruit of the oil palm tree (Elaeis guineensis). It is the most widely produced vegetable oil in the world and appears in roughly 50% of all packaged products sold in supermarkets.
Trans Fats (Partially Hydrogenated Oils)
AvoidArtificial fats created by adding hydrogen to liquid vegetable oils to make them solid at room temperature (hydrogenation). While the FDA banned artificial trans fats in 2018, trace amounts (< 0.5g per serving) can still be legally labeled as '0g trans fat.'