Dr. Joseph Mercola - Take Control of Your Health Seed Oils Linked to Early 20th Century Heart Disease Surge
Feb 16, 2026
They trace a 20th century surge in heart disease to the widespread rise of industrial seed oils like soybean, corn and canola. They highlight linoleic acid’s tendency to accumulate and oxidize in tissues over decades. They contrast processed seed oils with ancestral fats and discuss how hidden seed oils persist in packaged and restaurant foods.
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Heart Disease Was Once Rare
- Heart disease was rare before the 20th century and became common only after major environmental change.
- Joseph Mercola links this surge to a rapid dietary shift rather than sudden genetic failure.
Seed Oils Rose As Heart Disease Rose
- Industrial seed oils (soybean, corn, canola, cottonseed) became dominant in the 20th-century food supply.
- Their timing matches the dramatic rise in heart disease, suggesting a causal link.
Linoleic Acid Flooded Modern Diets
- Seed oils are extremely high in linoleic acid, an omega-6 fat humans historically consumed in trace amounts.
- Joseph Mercola emphasizes that modern intake jumped from ~1–2% of calories to 10–20% or more.